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Overview
Comment:Update the built-in SQLite to the latest 3.32.0 beta.
Timelines: family | ancestors | trunk
Files: files | file ages | folders
SHA1: c25acac6f82ee915cc97623e972474f2268645ec
User & Date: drh 2020-05-18 20:32:45
Context
2020-05-18
20:32
Update the built-in SQLite to the latest 3.32.0 beta. Leaf check-in: c25acac6f8 user: drh tags: trunk
2020-05-15
16:06
Adjustment to evidence mark. No code changes. check-in: cd9a67b547 user: drh tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to src/sqlite3.c.

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53749
53750
53751
53752
53753
53754
53755
53756
53757
53758
.....
53812
53813
53814
53815
53816
53817
53818
53819
53820
53821
53822
53823
53824
53825
53826
53827
53828
53829
53830
53831
53832
53833
53834
53835
53836
53837
53838
53839
53840
53841
53842
53843
53844
53845
.....
53882
53883
53884
53885
53886
53887
53888
53889
53890
53891
53892
53893
53894
53895
53896
53897
53898
53899
53900
.....
53989
53990
53991
53992
53993
53994
53995



53996
53997
53998
53999
54000
54001
54002
54003
54004
54005
.....
54446
54447
54448
54449
54450
54451
54452
54453
54454
54455
54456
54457
54458
54459
54460
54461
.....
55191
55192
55193
55194
55195
55196
55197
55198
55199
55200
55201
55202
55203
55204
55205
.....
55587
55588
55589
55590
55591
55592
55593
55594
55595
55596
55597
55598
55599
55600
55601
55602
55603
55604
55605
.....
55842
55843
55844
55845
55846
55847
55848
55849
55850
55851
55852
55853
55854
55855
55856
55857
.....
55932
55933
55934
55935
55936
55937
55938
55939
55940
55941
55942
55943
55944
55945
55946
55947
55948
55949
55950
55951
.....
56210
56211
56212
56213
56214
56215
56216
56217
56218
56219
56220
56221
56222
56223


56224



























56225
56226
56227
56228
56229
56230

56231


56232
56233
56234
56235
56236
56237
56238
56239
56240
56241
56242
56243
56244
56245
56246
56247
56248
56249
56250
56251
56252













56253
56254
56255
56256
56257
56258
56259
56260
56261
56262
56263
56264
56265
56266
56267
56268
56269
56270
56271
56272
56273
56274
56275
56276
56277
56278
56279
56280
56281
56282
56283
56284
56285
56286
56287
56288
56289
56290
56291
56292
56293
56294
56295
56296
56297
56298
56299
56300
56301
56302
.....
56447
56448
56449
56450
56451
56452
56453













56454
56455
56456
56457
56458
56459
56460
.....
57002
57003
57004
57005
57006
57007
57008
57009
57010
57011
57012
57013
57014
57015
57016
57017
57018
.....
57135
57136
57137
57138
57139
57140
57141
57142
57143
57144
57145
57146
57147
57148
57149
.....
57333
57334
57335
57336
57337
57338
57339
57340
57341
57342
57343
57344
57345
57346
57347
.....
57698
57699
57700
57701
57702
57703
57704
57705
57706
57707
57708
57709
57710
57711
57712
.....
58408
58409
58410
58411
58412
58413
58414
58415
58416
58417
58418
58419
58420
58421
58422
58423
.....
58428
58429
58430
58431
58432
58433
58434
58435
58436
58437
58438
58439
58440
58441
58442
58443
58444
58445
58446
58447
58448
58449
58450
58451
.....
58457
58458
58459
58460
58461
58462
58463
58464
58465
58466
58467
58468
58469
58470
58471
58472
58473
58474
58475
58476
58477
58478
58479
58480
58481
58482
58483
58484
58485
58486
58487
58488
58489
58490
58491
58492
58493
58494
58495
58496
58497
58498
58499
58500
58501
58502
58503
58504
58505
58506
58507
58508
58509
58510
58511
58512
58513
58514
58515
58516
58517
58518
.....
58899
58900
58901
58902
58903
58904
58905
58906
58907
58908
58909
58910
58911
58912
58913
.....
59064
59065
59066
59067
59068
59069
59070











59071













59072
59073
59074
59075
59076
59077
59078
.....
59084
59085
59086
59087
59088
59089
59090
59091



59092
59093
59094
59095
59096
59097
59098
.....
59420
59421
59422
59423
59424
59425
59426
59427
59428
59429
59430
59431
59432
59433
59434
59435
59436
59437
59438
59439
59440
59441
59442
59443
59444
59445
.....
59641
59642
59643
59644
59645
59646
59647



59648
59649
59650
59651
59652
59653
59654
.....
59739
59740
59741
59742
59743
59744
59745
59746
59747
59748
59749
59750
59751
59752
59753
.....
60014
60015
60016
60017
60018
60019
60020
60021
60022
60023
60024
60025
60026
60027
60028
.....
60030
60031
60032
60033
60034
60035
60036
60037
60038
60039
60040
60041
60042
60043
60044
.....
60849
60850
60851
60852
60853
60854
60855



















































































60856
60857
60858
60859
60860
60861
60862
.....
60867
60868
60869
60870
60871
60872
60873






60874
60875
60876
60877
60878
60879
60880
.....
60904
60905
60906
60907
60908
60909
60910
60911
60912
60913
60914
60915
60916
60917
60918
.....
61037
61038
61039
61040
61041
61042
61043

61044
61045
61046
61047
61048
61049
61050
61051
61052
61053
61054
61055
61056
61057
61058
61059
61060
61061
61062
.....
61064
61065
61066
61067
61068
61069
61070

61071
61072
61073
61074
61075
61076
61077
61078
61079
61080
61081
61082
61083
61084
61085
61086
61087
61088
61089
61090
61091
61092
61093
61094
.....
61348
61349
61350
61351
61352
61353
61354
61355
61356
61357
61358
61359
61360
61361


61362
61363
61364
61365
61366
61367
61368
61369
61370
61371
61372
61373
61374

61375
61376


61377
61378
61379
61380
61381
61382
61383
.....
61699
61700
61701
61702
61703
61704
61705
61706
61707
61708
61709
61710
61711
61712
61713
.....
61761
61762
61763
61764
61765
61766
61767
61768

61769
61770
61771
61772
61773
61774
61775
.....
61865
61866
61867
61868
61869
61870
61871
61872
61873
61874
61875
61876
61877
61878
61879
.....
61921
61922
61923
61924
61925
61926
61927


61928
61929
61930

61931
61932


















61933
61934
61935
61936
61937
61938
61939
.....
61958
61959
61960
61961
61962
61963
61964
61965
61966
61967
61968
61969
61970
61971
61972
61973
61974
61975
61976
61977
61978
61979
61980
61981
61982
61983
61984
61985
61986
61987
61988
61989
61990
61991
61992
61993
61994
61995
61996
61997






61998
61999
62000
62001
62002
62003
62004
62005
62006







62007
62008
62009
62010
62011
62012
62013
.....
62169
62170
62171
62172
62173
62174
62175










62176
62177
62178
62179
62180
62181
62182
.....
62415
62416
62417
62418
62419
62420
62421
62422
62423
62424
62425
62426
62427
62428
62429
62430
62431
62432
62433
.....
62602
62603
62604
62605
62606
62607
62608
62609
62610
62611
62612
62613
62614
62615
62616
62617
62618
62619
62620
.....
62753
62754
62755
62756
62757
62758
62759
62760





62761
62762
62763
62764
62765
62766
62767
62768
62769
62770

62771
62772
62773
62774


62775
62776
62777
62778
62779
62780
62781
62782
62783
62784
62785
62786
62787
62788
62789
62790
62791
62792
62793
62794
62795
62796


62797
62798

62799

62800
62801
62802
62803
62804
62805
62806
.....
62823
62824
62825
62826
62827
62828
62829



62830
62831
62832

62833
62834

62835



62836
62837
62838
62839
62840
62841
62842
.....
62945
62946
62947
62948
62949
62950
62951
62952



62953
62954
62955
62956
62957
62958
62959
.....
63464
63465
63466
63467
63468
63469
63470
63471
63472
63473
63474
63475
63476
63477
63478
63479
63480
.....
64667
64668
64669
64670
64671
64672
64673
64674
64675
64676
64677
64678
64679
64680
64681
.....
65505
65506
65507
65508
65509
65510
65511
65512
65513
65514
65515
65516
65517
65518
65519
.....
65836
65837
65838
65839
65840
65841
65842
65843
65844
65845
65846
65847
65848
65849
65850
.....
66360
66361
66362
66363
66364
66365
66366
66367
66368
66369
66370
66371
66372
66373
66374
66375
.....
66912
66913
66914
66915
66916
66917
66918

66919
66920
66921
66922
66923
66924

66925
66926
66927
66928
66929
66930
66931
66932
66933
66934
66935
66936
66937
66938
.....
66970
66971
66972
66973
66974
66975
66976
66977
66978
66979
66980
66981
66982
66983

66984
66985
66986
66987
66988
66989
66990
66991
66992
66993
66994
66995
66996
.....
67432
67433
67434
67435
67436
67437
67438

67439
67440
67441
67442
67443
67444
67445
.....
67447
67448
67449
67450
67451
67452
67453
67454
67455
67456
67457
67458
67459
67460
67461
.....
67495
67496
67497
67498
67499
67500
67501












67502
67503
67504
67505
67506
67507
67508
67509
67510
67511
67512
67513
67514
67515
67516
67517
67518
67519
67520
67521
67522
67523
67524
67525
67526
67527

67528
67529
67530
67531
67532



67533
67534
67535
67536
67537
67538
67539
.....
67577
67578
67579
67580
67581
67582
67583
67584
67585
67586
67587
67588
67589
67590
67591
.....
71213
71214
71215
71216
71217
71218
71219
71220
71221
71222
71223
71224
71225
71226
71227
.....
73570
73571
73572
73573
73574
73575
73576
73577
73578
73579
73580
73581
73582
73583
73584
.....
73592
73593
73594
73595
73596
73597
73598
73599
73600
73601
73602
73603
73604
73605
73606
.....
73643
73644
73645
73646
73647
73648
73649
73650
73651
73652
73653
73654
73655
73656
73657
.....
73718
73719
73720
73721
73722
73723
73724
73725
73726
73727
73728
73729
73730
73731
73732
.....
74694
74695
74696
74697
74698
74699
74700
74701
74702
74703
74704
74705
74706
74707
74708
.....
74817
74818
74819
74820
74821
74822
74823
74824
74825
74826
74827
74828
74829
74830
74831
74832
74833
74834
74835
74836
74837
.....
74840
74841
74842
74843
74844
74845
74846
74847
74848
74849
74850
74851
74852
74853
74854
74855
74856
74857
74858
74859
74860
74861
74862
74863
74864
74865
74866
74867
74868
74869
74870
74871
74872
74873
.....
75355
75356
75357
75358
75359
75360
75361
75362
75363
75364
75365
75366
75367
75368
75369
75370
75371
75372
.....
76348
76349
76350
76351
76352
76353
76354
76355
76356
76357
76358
76359
76360
76361
76362
76363
76364
76365
76366
76367
76368
76369
76370
76371
76372
76373
76374
.....
76556
76557
76558
76559
76560
76561
76562
76563
76564
76565
76566
76567
76568
76569
76570
.....
76579
76580
76581
76582
76583
76584
76585
76586
76587
76588
76589
76590
76591
76592
76593
76594
76595
76596
76597
76598
76599
76600
76601
76602
76603
76604
76605
76606
76607
76608
76609
76610
76611
76612
76613
76614
76615
76616
76617
.....
77718
77719
77720
77721
77722
77723
77724
77725
77726
77727
77728
77729
77730
77731
77732
.....
78359
78360
78361
78362
78363
78364
78365




























78366
78367
78368
78369
78370
78371
78372
.....
78730
78731
78732
78733
78734
78735
78736
78737

78738
78739
78740
78741
78742
78743
78744
78745
78746
78747



78748
78749
78750
78751
78752
78753
78754
.....
78755
78756
78757
78758
78759
78760
78761
78762
78763
78764
78765
78766
78767
78768
78769
78770
78771
78772
78773
78774
78775
78776
78777
78778
78779
78780
78781
78782


78783
78784














78785
78786
78787
78788
78789

78790
78791

78792
78793
78794
78795
78796
78797
78798
78799
78800
78801
78802
78803
78804
78805
78806


78807


78808
78809
78810
78811
78812
78813
78814
78815
.....
78882
78883
78884
78885
78886
78887
78888
78889
78890
78891
78892

78893
78894
78895
78896
78897
78898
78899
78900
.....
78912
78913
78914
78915
78916
78917
78918

78919

78920

78921
78922
78923
78924
78925
78926
78927
.....
78967
78968
78969
78970
78971
78972
78973
78974
78975
78976
78977
78978
78979
78980
78981
78982
78983
78984
78985
78986
78987
78988
78989
78990
78991
78992
78993
78994
78995
78996
78997
78998
78999



79000
79001
79002
79003
79004
79005
79006
79007
79008
79009
79010
.....
79086
79087
79088
79089
79090
79091
79092
79093
79094
79095
79096
79097


79098
79099

79100
79101
79102
79103
79104
79105
79106
79107

79108
79109
79110



79111
79112
79113
79114
79115
79116
79117
.....
79194
79195
79196
79197
79198
79199
79200



















































































































79201
79202
79203
79204
79205
79206
79207
.....
79234
79235
79236
79237
79238
79239
79240
79241
79242
79243
79244
79245
79246
79247
79248
79249
79250

79251
79252
79253
79254
79255
79256
79257
.....
79263
79264
79265
79266
79267
79268
79269
79270
79271
79272
79273
79274
79275
79276
79277
79278
79279
79280
79281
79282
79283
79284
79285
79286
79287
79288
79289
79290
79291
79292
79293
79294
79295
79296
79297
79298
79299
79300
79301
79302
79303
79304
79305
79306
79307
79308
79309
79310
79311
79312
79313
79314
79315
79316
79317
79318
79319
79320
79321
79322
79323
79324
79325
79326
79327
79328
79329
79330
79331
79332
79333
79334
79335
79336
79337
79338
79339
79340
79341
79342
79343


79344
79345
79346
79347
79348
79349
79350

79351
79352
79353
79354
79355
79356

79357
79358
79359
79360
79361
79362







79363
79364
79365
79366
79367
79368






79369
79370
79371
79372


79373
79374
79375
79376
79377
79378
79379
79380
79381
79382
79383
79384
79385
79386
79387
79388
79389
79390
79391
79392
79393
79394
79395
79396
79397
79398
79399
79400
79401



79402
79403
79404
79405
79406
79407
79408
79409
79410

79411
79412
79413
79414
79415
79416
79417
79418
79419
79420
79421
79422
79423
79424
79425

79426
79427
79428
79429
79430
79431
79432
.....
79626
79627
79628
79629
79630
79631
79632

79633
79634
79635
79636
79637
79638
79639
.....
79676
79677
79678
79679
79680
79681
79682
79683
79684
79685
79686
79687
79688
79689
79690
.....
79988
79989
79990
79991
79992
79993
79994
79995
79996

79997
79998
79999
80000
80001
80002
80003
.....
80019
80020
80021
80022
80023
80024
80025
80026
80027
80028
80029
80030
80031
80032
80033
.....
80042
80043
80044
80045
80046
80047
80048
80049
80050
80051
80052
80053
80054
80055
80056
80057
80058
80059
80060
80061
80062
80063
80064
80065
80066
80067
80068
80069
80070
.....
80079
80080
80081
80082
80083
80084
80085
80086
80087
80088
80089
80090
80091
80092
80093
80094
80095
80096
80097
80098
80099
80100
80101
80102
.....
80794
80795
80796
80797
80798
80799
80800
80801
80802
80803
80804
80805
80806
80807
80808
.....
81797
81798
81799
81800
81801
81802
81803
81804
81805
81806
81807
81808
81809
81810
81811
.....
81831
81832
81833
81834
81835
81836
81837
81838
81839
81840
81841
81842
81843
81844
81845
.....
82020
82021
82022
82023
82024
82025
82026


82027

82028
82029
82030
82031
82032
82033
82034
.....
82141
82142
82143
82144
82145
82146
82147
82148
82149
82150
82151
82152
82153
82154
82155
82156
82157
82158
82159
82160
82161
82162
82163
82164
82165
82166
82167
82168
82169
82170
82171
82172
.....
82223
82224
82225
82226
82227
82228
82229
82230
82231
82232
82233
82234
82235
82236
82237
.....
83136
83137
83138
83139
83140
83141
83142
83143
83144
83145
83146
83147
83148
83149
83150
.....
83828
83829
83830
83831
83832
83833
83834
83835
83836
83837
83838
83839
83840
83841
83842
.....
85239
85240
85241
85242
85243
85244
85245
85246
85247
85248
85249
85250
85251
85252
85253
.....
85254
85255
85256
85257
85258
85259
85260
85261
85262
85263
85264
85265
85266
85267
85268
.....
85521
85522
85523
85524
85525
85526
85527
85528
85529
85530
85531
85532
85533
85534
85535
.....
85705
85706
85707
85708
85709
85710
85711
85712
85713
85714
85715
85716
85717
85718
85719
.....
86358
86359
86360
86361
86362
86363
86364
86365
86366
86367
86368
86369
86370
86371
86372
.....
86889
86890
86891
86892
86893
86894
86895
86896
86897
86898
86899
86900
86901
86902
86903
.....
86912
86913
86914
86915
86916
86917
86918
86919
86920
86921
86922
86923
86924
86925
86926
.....
87527
87528
87529
87530
87531
87532
87533
87534
87535
87536
87537
87538
87539
87540
87541
.....
88002
88003
88004
88005
88006
88007
88008
88009
88010
88011
88012
88013




88014
88015
88016
88017
88018
88019
88020
88021
88022



88023
88024
88025

88026
88027
88028
88029
88030
88031
88032
88033
88034
88035
88036
88037
.....
88479
88480
88481
88482
88483
88484
88485
88486
88487
88488
88489
88490
88491
88492
88493
.....
88509
88510
88511
88512
88513
88514
88515
88516
88517
88518
88519
88520
88521
88522
88523
.....
88533
88534
88535
88536
88537
88538
88539
88540
88541
88542
88543
88544
88545
88546
88547
.....
88645
88646
88647
88648
88649
88650
88651
88652
88653
88654
88655
88656
88657
88658
88659
88660
88661
.....
88903
88904
88905
88906
88907
88908
88909
88910
88911
88912
88913
88914


88915
88916
88917
88918
88919
88920
88921
.....
88923
88924
88925
88926
88927
88928
88929
88930
88931
88932
88933
88934
88935
88936
88937
.....
88968
88969
88970
88971
88972
88973
88974
88975
88976
88977
88978
88979


88980
88981
88982
88983
88984
88985
88986
.....
89009
89010
89011
89012
89013
89014
89015
89016
89017
89018
89019
89020
89021
89022
89023
.....
89068
89069
89070
89071
89072
89073
89074
89075
89076
89077

89078
89079
89080
89081
89082


89083
89084
89085
89086
89087
89088
89089
.....
90023
90024
90025
90026
90027
90028
90029
90030
90031
90032
90033
90034
90035
90036
90037
.....
90401
90402
90403
90404
90405
90406
90407
90408
90409
90410
90411
90412
90413
90414
90415
90416
90417
90418
90419
90420
90421
90422
90423
90424
90425
90426
90427
90428
90429
90430
90431
90432
90433
90434
90435
90436
90437
90438
90439
90440
90441
90442
90443
90444


90445






















90446
90447
90448
90449
90450
90451
90452
90453
90454
90455







90456
90457
90458
90459
90460
90461
90462
.....
90465
90466
90467
90468
90469
90470
90471
90472
90473
90474
90475
90476
90477
90478
90479
90480
90481



90482
90483
90484
90485
90486
90487
90488
.....
91277
91278
91279
91280
91281
91282
91283
91284
91285
91286
91287
91288
91289
91290
91291
.....
92388
92389
92390
92391
92392
92393
92394
92395
92396
92397
92398
92399
92400
92401
92402
.....
92407
92408
92409
92410
92411
92412
92413
92414
92415
92416
92417
92418
92419
92420
92421
.....
92796
92797
92798
92799
92800
92801
92802
92803
92804
92805
92806
92807
92808
92809
92810
.....
94134
94135
94136
94137
94138
94139
94140
94141
94142
94143
94144
94145
94146
94147
94148
94149
.....
95092
95093
95094
95095
95096
95097
95098
95099
95100
95101
95102
95103
95104
95105
95106
.....
96079
96080
96081
96082
96083
96084
96085











































































































































































































































































































































































































































96086
96087
96088
96089
96090
96091
96092
.....
96670
96671
96672
96673
96674
96675
96676
96677
96678
96679
96680
96681
96682
96683
96684
96685

96686
96687
96688
96689
96690
96691
96692
.....
96865
96866
96867
96868
96869
96870
96871
96872
96873
96874
96875
96876
96877
96878
96879
.....
96899
96900
96901
96902
96903
96904
96905

























96906
96907
96908
96909
96910
96911
96912
.....
96977
96978
96979
96980
96981
96982
96983






96984
96985
96986
96987
96988
96989
96990
96991
96992
96993
96994

96995
96996
96997
96998
96999
97000
97001
.....
97021
97022
97023
97024
97025
97026
97027

97028
97029
97030
97031
97032
97033
97034
97035
97036
.....
97083
97084
97085
97086
97087
97088
97089

97090
97091
97092
97093
97094
97095
97096
97097
97098
97099
97100
.....
97296
97297
97298
97299
97300
97301
97302
97303
97304
97305
97306
97307
97308
97309
97310
97311
97312
97313
97314
97315
97316
97317
97318
97319
97320
97321
97322
97323
97324
97325
.....
97593
97594
97595
97596
97597
97598
97599

97600
97601
97602



97603
97604

97605
97606
97607
97608
97609
97610
97611
.....
97773
97774
97775
97776
97777
97778
97779
97780
97781
97782
97783
97784
97785
97786
97787
.....
97899
97900
97901
97902
97903
97904
97905
97906
97907
97908
97909
97910
97911
97912
97913
.....
98534
98535
98536
98537
98538
98539
98540


98541







98542





98543
98544













98545



98546
98547
98548
98549
98550
98551
98552
.....
98669
98670
98671
98672
98673
98674
98675
98676
98677
98678
98679
98680
98681
98682
98683
98684
98685
98686
.....
98739
98740
98741
98742
98743
98744
98745
98746
98747
98748
98749
98750
98751
98752
98753
.....
98758
98759
98760
98761
98762
98763
98764
98765
98766
98767
98768
98769
98770
98771
98772
.....
98779
98780
98781
98782
98783
98784
98785
98786
98787
98788
98789
98790
98791
98792
98793
98794
98795
98796
.....
98851
98852
98853
98854
98855
98856
98857
98858
98859
98860
98861
98862
98863
98864
98865
98866
98867
98868
98869
98870
98871
98872
98873
98874
98875
98876
98877
98878
98879
98880
98881
98882
98883
98884
98885
98886
.....
98894
98895
98896
98897
98898
98899
98900
98901
98902
98903
98904
98905
98906
98907
98908
.....
98917
98918
98919
98920
98921
98922
98923
98924
98925
98926
98927
98928
98929
98930
98931
.....
98932
98933
98934
98935
98936
98937
98938
98939




98940
98941
98942
98943
98944
98945
98946
.....
98952
98953
98954
98955
98956
98957
98958
98959
98960
98961
98962
98963
98964
98965
98966
98967
.....
98978
98979
98980
98981
98982
98983
98984
98985
98986
98987
98988
98989
98990
98991
98992
.....
99221
99222
99223
99224
99225
99226
99227

99228
99229
99230
99231
99232
99233
99234
.....
99833
99834
99835
99836
99837
99838
99839
99840
99841
99842
99843
99844
99845
99846
99847
.....
99938
99939
99940
99941
99942
99943
99944




99945
99946
99947
99948
99949
99950
99951
......
100405
100406
100407
100408
100409
100410
100411

100412
100413
100414
100415
100416
100417
100418




100419
100420
100421

100422
100423
100424
100425
100426
100427
100428
......
100714
100715
100716
100717
100718
100719
100720
100721
100722
100723
100724
100725
100726
100727
100728
......
101477
101478
101479
101480
101481
101482
101483

101484
101485
101486
101487
101488
101489
101490
......
101558
101559
101560
101561
101562
101563
101564


101565
101566
101567
101568
101569
101570
101571
......
101796
101797
101798
101799
101800
101801
101802

101803

101804
101805
101806
101807
101808
101809
101810
......
101839
101840
101841
101842
101843
101844
101845
101846





101847

101848
101849
101850
101851
101852
101853
101854
......
101866
101867
101868
101869
101870
101871
101872
101873
101874
101875
101876
101877
101878
101879
101880
101881
101882
101883
101884
101885
101886
101887
101888
101889
101890
101891
101892
101893
101894
......
102123
102124
102125
102126
102127
102128
102129
102130
102131
102132
102133
102134
102135
102136
102137
......
102263
102264
102265
102266
102267
102268
102269










102270
102271
102272
102273
102274
102275
102276
......
102295
102296
102297
102298
102299
102300
102301
102302
102303
102304
102305
102306
102307







102308
102309
102310
102311
102312
102313
102314
......
102399
102400
102401
102402
102403
102404
102405

102406
102407
102408
102409
102410
102411
102412
102413
102414
102415

102416
102417








102418
102419
102420
102421
102422
102423
102424
......
102436
102437
102438
102439
102440
102441
102442
102443
102444
102445
102446
102447
102448
102449
102450
102451
102452
102453
......
102653
102654
102655
102656
102657
102658
102659

102660
102661
102662
102663
102664
102665
102666
......
102724
102725
102726
102727
102728
102729
102730
102731
102732
102733
102734
102735
102736
102737
102738
102739
102740
102741
102742
102743
102744
102745
102746
102747
......
103068
103069
103070
103071
103072
103073
103074

103075
103076
103077
103078
103079
103080
103081
103082
103083
103084
103085
103086
103087
103088
103089
103090
103091
103092
103093
103094
103095
103096
103097
103098
103099

103100
103101
103102
103103
103104
103105
103106
103107
103108
103109
103110
103111
103112
103113






103114
103115
103116
103117
103118
103119


103120
103121
103122
103123
103124
103125
103126
103127
103128
......
103132
103133
103134
103135
103136
103137
103138














103139
103140
103141
103142
103143
103144
103145
103146

103147
103148
103149
103150
103151
103152
103153
......
103164
103165
103166
103167
103168
103169
103170
103171
103172
103173
103174
103175
103176
103177
103178
......
103186
103187
103188
103189
103190
103191
103192

103193
103194
103195
103196
103197
103198
103199
......
103220
103221
103222
103223
103224
103225
103226
103227
103228
103229
103230
103231
103232
103233
103234
103235
103236
......
103280
103281
103282
103283
103284
103285
103286
103287
103288
103289
103290
103291
103292
103293
103294
......
103403
103404
103405
103406
103407
103408
103409

103410
103411
103412
103413
103414
103415
103416
......
103544
103545
103546
103547
103548
103549
103550

103551
103552
103553
103554
103555
103556
103557
......
103827
103828
103829
103830
103831
103832
103833
103834
103835
103836
103837
103838
103839
103840
103841
103842
103843
103844
103845
103846
103847
103848
103849
103850
103851
103852
103853
103854
103855
103856
103857
103858
103859
103860
103861
103862
103863
103864
103865
103866
......
104090
104091
104092
104093
104094
104095
104096
104097


104098
104099
104100
104101
104102
104103


104104

104105

104106
104107
104108
104109
104110
104111
104112
104113
104114
104115
104116
......
104699
104700
104701
104702
104703
104704
104705
104706



104707
104708
104709
104710
104711
104712
104713
......
104830
104831
104832
104833
104834
104835
104836
















104837
104838
104839
104840
104841
104842
104843
......
104883
104884
104885
104886
104887
104888
104889

104890
104891
104892
104893
104894
104895
104896
104897
104898
104899
104900
104901
104902
104903
104904
104905
104906
104907
104908
104909
104910
104911

104912
104913
104914
104915
104916
104917
104918
......
104919
104920
104921
104922
104923
104924
104925
104926
104927
104928
104929
104930
104931
104932
104933
104934
104935
104936
104937
104938
104939
104940
......
105045
105046
105047
105048
105049
105050
105051

105052
105053
105054
105055
105056
105057
105058
......
105273
105274
105275
105276
105277
105278
105279
105280
105281
105282
105283
105284
105285
105286
105287
......
105330
105331
105332
105333
105334
105335
105336















105337
105338
105339
105340
105341
105342
105343
......
105352
105353
105354
105355
105356
105357
105358

105359
105360
105361
105362
105363
105364
105365
......
105559
105560
105561
105562
105563
105564
105565

105566
105567
105568
105569
105570
105571
105572
......
106471
106472
106473
106474
106475
106476
106477





106478
106479
106480
106481
106482
106483
106484
106485
106486
106487
106488
106489

106490
106491

106492
106493
106494
106495
106496
106497
106498
......
106500
106501
106502
106503
106504
106505
106506
106507
106508
106509
106510
106511
106512
106513
106514
......
106519
106520
106521
106522
106523
106524
106525
106526
106527
106528
106529
106530
106531
106532
106533
......
106539
106540
106541
106542
106543
106544
106545
106546
106547
106548
106549
106550
106551
106552
106553
106554
106555
......
106556
106557
106558
106559
106560
106561
106562
106563


106564
106565

106566
106567




106568
106569
106570
106571
106572
106573
106574
106575
106576
106577
106578
106579
106580
106581
106582
106583
106584
106585
106586
106587
106588
106589
106590
106591
106592
106593
106594
106595
106596
106597
106598
106599
106600
106601
106602
......
106604
106605
106606
106607
106608
106609
106610
106611
106612
106613
106614
106615
106616
106617
106618
106619
106620
106621
106622
106623
106624
106625
106626
106627
106628
106629
106630
106631
......
106633
106634
106635
106636
106637
106638
106639
106640
106641
106642
106643
106644

106645
106646
106647
106648

106649
106650
106651
106652
106653
106654
106655
106656
106657
106658

106659
106660
106661
106662
106663
106664
106665
106666
106667
106668
106669
106670
106671
106672
106673
106674
106675
106676
106677
106678
106679
106680
106681
106682
106683
106684
106685
106686
106687
106688

106689
106690
106691
106692
106693
106694
106695
106696
106697
106698
106699
106700
106701
106702
106703
106704

106705
106706
106707

106708
106709
106710
106711
106712
106713
106714
106715
106716
106717

106718

106719
106720

106721
106722
106723
106724
106725

106726
106727
106728
106729
106730
106731
106732
106733
106734
106735
106736
106737
106738
106739
106740
106741
106742
106743
......
106749
106750
106751
106752
106753
106754
106755
106756
106757
106758
106759
106760
106761
106762
106763
106764
106765
106766
......
106776
106777
106778
106779
106780
106781
106782
106783
106784
106785
106786
106787
106788
106789
106790
106791
106792
......
106800
106801
106802
106803
106804
106805
106806
106807
106808
106809
106810
106811
106812
106813
106814
106815
106816
......
106822
106823
106824
106825
106826
106827
106828
106829
106830
106831
106832
106833
106834
106835
106836
106837
106838
106839
106840
106841
106842
106843
106844
106845
106846
106847
106848
106849
106850
106851
106852
106853
106854
106855
106856
106857
106858
106859
......
106864
106865
106866
106867
106868
106869
106870
106871
106872
106873
106874
106875
106876
106877
106878
......
106907
106908
106909
106910
106911
106912
106913

106914
106915
106916
106917
106918
106919
106920
106921
106922
106923
106924
106925
106926
106927
106928
106929
106930
106931
106932
106933
106934
......
106944
106945
106946
106947
106948
106949
106950
106951
106952
106953
106954
106955
106956
106957
106958
106959
106960
106961
106962
106963
106964
106965
106966
106967
106968
106969
106970
106971



106972
106973
106974
106975
106976
106977
106978
106979
106980
106981
106982
106983
106984
106985
106986
106987
106988
106989
106990
106991
106992
106993
106994
106995

106996

106997
106998
106999
107000
107001
107002
107003
107004
107005
107006
107007
107008
107009
107010

107011
107012


107013
107014
107015
107016
107017
107018
107019
107020
107021
107022
107023
107024
107025
107026
107027
107028
107029
107030
107031
107032
......
107034
107035
107036
107037
107038
107039
107040
107041
107042



107043


107044
107045
107046
107047
107048
107049
107050
......
107058
107059
107060
107061
107062
107063
107064
107065
107066
107067
107068
107069
107070
107071
107072
107073
107074
107075
107076
107077
107078
107079
107080
107081
107082
107083
107084
107085
107086
107087
107088
107089
107090
107091
107092
107093
107094

107095
107096
107097
107098
107099
107100
107101
107102
107103
107104
107105
107106
107107
107108
107109
107110
107111
107112
107113
107114
......
107123
107124
107125
107126
107127
107128
107129
107130

107131
107132
107133
107134
107135
107136
107137
......
107143
107144
107145
107146
107147
107148
107149
107150
107151
107152
107153
107154
107155
107156
107157
......
107199
107200
107201
107202
107203
107204
107205
107206
107207
107208
107209
107210
107211
107212
107213
107214
107215
107216
107217
107218
107219
107220
107221
107222
......
107234
107235
107236
107237
107238
107239
107240
107241
107242
107243
107244
107245
107246

107247
107248
107249
107250
107251
107252
107253
......
107367
107368
107369
107370
107371
107372
107373
107374
107375
107376
107377
107378



107379

107380



107381






107382
107383
107384
107385
107386
107387
107388
107389
107390
107391
107392
107393
107394
107395
107396
107397
107398
107399
107400
107401
107402
107403
......
107422
107423
107424
107425
107426
107427
107428

107429
107430
107431
107432
107433
107434
107435
......
107442
107443
107444
107445
107446
107447
107448

107449
107450
107451
107452
107453
107454
107455
107456
107457
107458
107459
107460
107461

107462
107463
107464
107465
107466
107467
107468
107469
107470
107471
107472
107473

107474
107475
107476
107477

107478
107479

107480
107481







107482




107483


107484
107485
107486
107487
107488
107489
107490
107491
107492
107493
107494
107495
107496
107497
107498
107499
107500
107501
107502
107503
107504
107505
107506
107507
107508
107509
107510
107511
107512
107513
107514
107515
107516
107517
107518
107519
107520
107521
107522
107523
......
108202
108203
108204
108205
108206
108207
108208











108209
108210
108211
108212
108213
108214
108215
......
108275
108276
108277
108278
108279
108280
108281
108282
108283
108284
108285
108286
108287
108288
108289
108290
108291
......
108345
108346
108347
108348
108349
108350
108351
108352
108353
108354
108355
108356
108357
108358
108359
108360
108361
108362
108363
108364
108365
108366
108367
108368
108369
108370
108371
108372
108373
108374
108375
108376
108377
108378
108379
108380
108381
108382
108383
108384
108385
108386
108387
108388
108389
108390
108391
108392
108393
108394
108395
......
108466
108467
108468
108469
108470
108471
108472
108473
108474
108475
108476
108477
108478
108479
108480
......
108657
108658
108659
108660
108661
108662
108663
108664
108665


108666
108667
108668

108669
108670
108671

108672
108673
108674
108675
108676
108677
108678
108679
108680
108681
108682
108683
108684
......
109392
109393
109394
109395
109396
109397
109398
109399
109400
109401
109402

109403
109404




109405
109406
109407
109408
109409

109410
109411
109412


109413














109414
109415
109416
109417
109418
109419
109420
109421
......
109517
109518
109519
109520
109521
109522
109523
109524
109525
109526
109527
109528
109529
109530
109531
......
109670
109671
109672
109673
109674
109675
109676

109677
109678
109679
109680
109681
109682
109683
......
110318
110319
110320
110321
110322
110323
110324

110325
110326
110327
110328
110329
110330
110331
......
111209
111210
111211
111212
111213
111214
111215






















111216
111217
111218
111219
111220
111221
111222
111223
111224
111225
111226
111227
111228
111229
111230
111231
111232
111233
111234
111235
111236
111237
111238
111239
111240
111241
111242



























111243
111244
111245
111246
111247
111248
111249
......
111329
111330
111331
111332
111333
111334
111335


111336
111337
111338
111339
111340
111341
111342
......
113680
113681
113682
113683
113684
113685
113686
113687
113688
113689
113690
113691
113692
113693
113694
......
113791
113792
113793
113794
113795
113796
113797
113798
113799
113800
113801
113802
113803
113804
113805
......
114270
114271
114272
114273
114274
114275
114276


114277
114278

114279
114280
114281
114282
114283
114284
114285
114286













114287
114288
114289
114290
114291
114292
114293
......
115166
115167
115168
115169
115170
115171
115172
115173


115174
115175
115176
115177
115178
115179
115180
......
115489
115490
115491
115492
115493
115494
115495

115496
115497
115498
115499
115500
115501
115502
......
116452
116453
116454
116455
116456
116457
116458

116459
116460
116461
116462
116463
116464
116465
......
116487
116488
116489
116490
116491
116492
116493






116494
116495
116496
116497
116498
116499
116500
......
116875
116876
116877
116878
116879
116880
116881
116882
116883
116884
116885
116886
116887
116888
116889
......
117463
117464
117465
117466
117467
117468
117469



117470
117471
117472
117473
117474
117475
117476
117477
117478
117479
117480
117481
117482
117483
117484
117485
117486
117487
117488
117489
117490
117491














117492
117493
117494
117495
117496
117497
117498
......
117565
117566
117567
117568
117569
117570
117571
117572
117573
117574
117575
117576
117577
117578
117579
......
117605
117606
117607
117608
117609
117610
117611
117612

117613
117614
117615
117616
117617
117618
117619
......
118293
118294
118295
118296
118297
118298
118299
118300
118301
118302
118303
118304
118305
118306
118307
......
120692
120693
120694
120695
120696
120697
120698
120699
120700
120701
120702
120703
120704
120705
120706
......
120747
120748
120749
120750
120751
120752
120753

120754
120755
120756
120757
120758
120759
120760




120761
120762
120763


120764


120765
120766
120767
120768
120769
120770
120771
......
121256
121257
121258
121259
121260
121261
121262

121263
121264
121265
121266
121267

121268
121269
121270
121271
121272
121273
121274
121275
......
121869
121870
121871
121872
121873
121874
121875
121876
121877
121878
121879
121880
121881
121882
121883

121884
121885
121886
121887
121888
121889
121890
......
121901
121902
121903
121904
121905
121906
121907
121908
121909
121910
121911
121912
121913
121914
121915
......
121925
121926
121927
121928
121929
121930
121931
121932
121933
121934
121935

121936
121937
121938
121939
121940
121941
121942
......
122449
122450
122451
122452
122453
122454
122455





122456
122457
122458
122459
122460
122461
122462
......
122739
122740
122741
122742
122743
122744
122745
122746
122747
122748
122749
122750
122751
122752
122753
122754
122755




122756
122757
122758
122759
122760
122761
122762
......
123227
123228
123229
123230
123231
123232
123233




123234








123235
123236
123237
123238
123239
123240
123241
......
123330
123331
123332
123333
123334
123335
123336
123337
123338
123339
123340
123341
123342
123343
123344
......
123633
123634
123635
123636
123637
123638
123639


123640
123641
123642
123643
123644
123645
123646
123647
123648
123649
123650
123651
123652
123653
123654
123655
123656
123657
123658
123659
123660
123661
123662
123663
123664
123665
123666
123667
123668
123669
123670
123671
123672
123673
123674
123675
123676
123677
123678
123679
123680
123681
123682
123683
123684
123685
123686
123687
123688
123689
......
123761
123762
123763
123764
123765
123766
123767
123768
123769
123770
123771
123772
123773
123774





123775
123776
123777
123778
123779
123780
123781
......
123957
123958
123959
123960
123961
123962
123963
123964
123965
123966
123967
123968
123969
123970
123971
123972
123973
123974
123975
123976
123977
123978
123979
123980
123981
123982
......
124018
124019
124020
124021
124022
124023
124024
124025
124026
124027
124028
124029
124030
124031
124032
124033
124034
124035
124036
124037
124038
......
124135
124136
124137
124138
124139
124140
124141
124142
124143
124144
124145
124146
124147
124148
124149
124150
124151
124152
124153
124154
124155
124156
124157
......
124228
124229
124230
124231
124232
124233
124234
124235
124236
124237
124238
124239
124240
124241
124242
124243
124244
124245
124246
124247
124248
124249
124250
124251
124252
124253
......
124308
124309
124310
124311
124312
124313
124314
124315
124316
124317
124318
124319
124320
124321
124322
......
124838
124839
124840
124841
124842
124843
124844
124845
124846
124847
124848
124849
124850
124851
124852
......
126012
126013
126014
126015
126016
126017
126018
126019
126020
126021
126022
126023
126024
126025
126026
126027
126028
126029
126030
126031
126032
126033
126034
126035
126036
126037
126038
126039
126040
......
126107
126108
126109
126110
126111
126112
126113
126114
126115
126116
126117
126118
126119
126120
126121
126122
126123
126124
126125
126126
126127
126128


126129
126130
126131
126132
126133
126134
126135
......
126469
126470
126471
126472
126473
126474
126475



















126476
126477
126478
126479
126480
126481
126482
......
126498
126499
126500
126501
126502
126503
126504
126505
126506
126507
126508
126509
126510
126511
126512
126513
126514
126515
126516
126517
126518
126519
126520
126521
126522
126523
126524
126525
126526
126527
126528
126529
126530
126531
126532
126533
126534
126535
126536
126537
126538
126539
126540
126541
126542
126543
126544
126545
126546
126547
126548
126549
126550
126551
126552
126553
126554
126555
126556
126557
126558
126559
126560
126561
126562
126563
126564
......
126978
126979
126980
126981
126982
126983
126984
126985
126986
126987
126988
126989
126990
126991
126992
......
127066
127067
127068
127069
127070
127071
127072

127073
127074
127075
127076
127077
127078
127079
......
127094
127095
127096
127097
127098
127099
127100

127101
127102
127103
127104
127105
127106
127107
......
127153
127154
127155
127156
127157
127158
127159
127160
127161
127162

127163
127164
127165
127166
127167
127168
127169

127170
127171
127172
127173
127174
127175
127176
127177
127178
127179
127180
127181
127182
127183
127184
127185
127186
127187
......
127285
127286
127287
127288
127289
127290
127291
127292
127293
127294
127295
127296
127297
127298
127299
127300
......
127922
127923
127924
127925
127926
127927
127928
127929
127930
127931
127932
127933
127934
127935
127936
......
129843
129844
129845
129846
129847
129848
129849

129850
129851
129852
129853
129854
129855
129856
......
130625
130626
130627
130628
130629
130630
130631

130632
130633
130634
130635
130636
130637
130638
......
131295
131296
131297
131298
131299
131300
131301

131302


131303
131304
131305
131306
131307
131308
131309
......
131313
131314
131315
131316
131317
131318
131319

131320
131321
131322
131323
131324
131325
131326
......
131396
131397
131398
131399
131400
131401
131402
































131403
131404
131405
131406
131407
131408
131409
......
131937
131938
131939
131940
131941
131942
131943






131944
131945
131946
131947
131948
131949
131950
......
131985
131986
131987
131988
131989
131990
131991
131992
131993
131994
131995
131996
131997
131998
131999
132000
132001
......
132010
132011
132012
132013
132014
132015
132016
132017
132018
132019
132020
132021
132022
132023
132024
132025
132026
......
132288
132289
132290
132291
132292
132293
132294
132295
132296
132297
132298
132299
132300
132301
132302
132303
132304
132305

132306

132307
132308
132309
132310
132311
132312
132313
......
132658
132659
132660
132661
132662
132663
132664
132665
132666
132667
132668
132669
132670
132671
132672
......
132789
132790
132791
132792
132793
132794
132795
132796
132797
132798
132799
132800
132801
132802
132803
132804
132805

132806
132807
132808
132809
132810
132811
132812
132813

132814
132815
132816
132817
132818
132819
132820
......
132965
132966
132967
132968
132969
132970
132971
132972
132973
132974
132975
132976
132977
132978
132979
......
133169
133170
133171
133172
133173
133174
133175

133176
133177
133178
133179
133180
133181
133182
......
133310
133311
133312
133313
133314
133315
133316
133317
133318
133319
133320
133321
133322
133323
133324
......
134438
134439
134440
134441
134442
134443
134444
134445
134446
134447
134448
134449
134450
134451
134452
......
134474
134475
134476
134477
134478
134479
134480

134481
134482
134483
134484
134485
134486
134487

134488
134489
134490
134491
134492
134493
134494
......
134496
134497
134498
134499
134500
134501
134502
134503
134504
134505
134506
134507
134508
134509
134510
134511
134512
......
134661
134662
134663
134664
134665
134666
134667
134668
134669
134670
134671
134672
134673
134674
134675
......
134770
134771
134772
134773
134774
134775
134776
134777
134778
134779
134780
134781
134782
134783
134784
......
135386
135387
135388
135389
135390
135391
135392
135393
135394
135395
135396
135397
135398
135399
135400
......
136060
136061
136062
136063
136064
136065
136066
136067
136068
136069
136070
136071
136072
136073
136074
136075
136076
136077
......
136080
136081
136082
136083
136084
136085
136086
136087
136088
136089
136090
136091
136092
136093
136094
......
136623
136624
136625
136626
136627
136628
136629
136630


136631
136632
136633
136634
136635
136636
136637
......
137576
137577
137578
137579
137580
137581
137582
137583
137584
137585
137586
137587
137588
137589
137590
137591
137592
137593
137594
137595
137596
137597
137598
137599
137600
137601
......
137731
137732
137733
137734
137735
137736
137737
137738
137739
137740
137741
137742
137743
137744
137745
......
138938
138939
138940
138941
138942
138943
138944
138945
138946
138947
138948
138949
138950
138951
138952
......
139395
139396
139397
139398
139399
139400
139401






139402
139403
139404
139405
139406
139407
139408
......
139509
139510
139511
139512
139513
139514
139515
139516

139517
139518
139519
139520
139521
139522


139523
139524
139525
139526
139527
139528
139529
......
141129
141130
141131
141132
141133
141134
141135

141136

141137
141138
141139
141140
141141
141142
141143
......
141406
141407
141408
141409
141410
141411
141412



141413
141414
141415
141416
141417
141418
141419
......
142543
142544
142545
142546
142547
142548
142549
142550

142551
142552
142553
142554
142555
142556
142557
......
142565
142566
142567
142568
142569
142570
142571
142572

142573
142574
142575
142576
142577
142578
142579
......
142588
142589
142590
142591
142592
142593
142594
142595

142596
142597
142598

142599
142600
142601
142602
142603
142604
142605
......
146075
146076
146077
146078
146079
146080
146081
146082


146083
146084
146085
146086
146087
146088
146089
146090
146091



146092
146093
146094
146095
146096
146097
146098
......
146266
146267
146268
146269
146270
146271
146272
146273
146274
146275
146276
146277
146278
146279
146280
146281
146282
......
146433
146434
146435
146436
146437
146438
146439





















146440
146441
146442
146443
146444
146445
146446
......
146509
146510
146511
146512
146513
146514
146515

146516
146517
146518
146519
146520
146521
146522
......
146856
146857
146858
146859
146860
146861
146862
146863
146864
146865
146866
146867
146868
146869
146870
146871
146872
......
147529
147530
147531
147532
147533
147534
147535
147536
147537



147538
147539
147540
147541
147542
147543
147544
......
148310
148311
148312
148313
148314
148315
148316






















148317
148318
148319
148320
148321
148322
148323
......
148611
148612
148613
148614
148615
148616
148617
148618








148619
148620



148621
148622
148623
148624
148625
148626
148627


148628


148629
148630

148631
148632
148633
148634
148635
148636
148637
......
148894
148895
148896
148897
148898
148899
148900
148901
148902
148903
148904
148905
148906
148907
148908
......
149052
149053
149054
149055
149056
149057
149058
149059
149060
149061
149062
149063
149064
149065
149066
149067
149068
149069
149070
149071
149072
149073
149074
149075

149076
149077






149078
149079
149080
149081
149082
149083
149084
......
150150
150151
150152
150153
150154
150155
150156
150157
150158
150159
150160






150161
150162
150163

150164
150165
150166
150167
150168
150169
150170
......
150188
150189
150190
150191
150192
150193
150194

150195
150196
150197
150198
150199
150200
150201
......
150277
150278
150279
150280
150281
150282
150283

150284
150285
150286
150287
150288
150289
150290
......
151165
151166
151167
151168
151169
151170
151171

151172
151173
151174
151175
151176
151177
151178
......
151543
151544
151545
151546
151547
151548
151549




151550
151551
151552
151553
151554
151555
151556
......
152380
152381
152382
152383
152384
152385
152386

152387
152388
152389
152390
152391
152392
152393
......
156448
156449
156450
156451
156452
156453
156454







156455
156456
156457
156458
156459
156460
156461
......
157719
157720
157721
157722
157723
157724
157725
157726
157727
157728



157729
157730
157731



157732
157733
157734
157735
157736
157737
157738
......
158322
158323
158324
158325
158326
158327
158328
158329
158330
158331
158332
158333
158334
158335
158336
......
158367
158368
158369
158370
158371
158372
158373
158374
158375
158376
158377
158378
158379
158380
158381
......
159034
159035
159036
159037
159038
159039
159040

























159041
159042
159043
159044
159045
159046















159047
159048
159049























159050
159051
159052
159053
159054
159055
159056
......
159170
159171
159172
159173
159174
159175
159176
159177



159178
159179
159180
159181
159182
159183
159184
......
159256
159257
159258
159259
159260
159261
159262

159263
159264
159265
159266
159267
159268
159269
......
160557
160558
160559
160560
160561
160562
160563
160564
160565
160566
160567
160568
160569
160570
160571
160572
160573
160574
160575
160576
160577
160578
160579
160580
160581
160582
160583
160584
160585
160586
160587
160588
160589
160590
160591
160592
160593
160594
160595
160596
160597
160598
......
160604
160605
160606
160607
160608
160609
160610
160611
160612
160613
160614
160615
160616
160617
160618
......
160622
160623
160624
160625
160626
160627
160628
160629
160630
160631
160632
160633
160634
160635
160636
160637
160638
160639
160640
160641
160642
160643
160644
160645
160646
160647
160648
......
160659
160660
160661
160662
160663
160664
160665
160666
160667
160668
160669
160670
160671
160672
160673
......
160710
160711
160712
160713
160714
160715
160716
160717
160718
160719
160720
160721
160722
160723
160724
......
160727
160728
160729
160730
160731
160732
160733
160734
160735
160736
160737
160738
160739
160740
160741
......
161349
161350
161351
161352
161353
161354
161355
161356
161357
161358
161359
161360
161361
161362
161363
......
161759
161760
161761
161762
161763
161764
161765
161766
161767
161768


161769
161770
161771
161772
161773
161774
161775
......
161793
161794
161795
161796
161797
161798
161799
161800
161801
161802
161803
161804
161805
161806
161807
161808



161809
161810
161811
161812
161813
161814
161815
......
161892
161893
161894
161895
161896
161897
161898
161899
161900
161901
161902
161903
161904
161905
161906
161907
......
161973
161974
161975
161976
161977
161978
161979
161980
161981


161982
161983
161984
161985
161986
161987
161988
161989
161990
161991
161992
161993
161994
161995
161996
161997
161998
161999
162000
162001
162002
162003
162004
162005
162006

162007
162008
162009
162010


162011
162012
162013
162014
162015
162016
162017
162018
162019
162020
162021
162022
162023
162024
162025
162026
162027
162028
162029
162030
162031
162032
162033
162034
162035
162036
162037
162038
162039
162040
162041
162042
162043
162044
......
162049
162050
162051
162052
162053
162054
162055

162056
162057
162058
162059
162060
162061
162062
......
162197
162198
162199
162200
162201
162202
162203



162204
162205
162206
162207
162208
162209
162210
......
162218
162219
162220
162221
162222
162223
162224
162225
162226
162227
162228
162229
162230
162231
162232
162233
162234
162235
162236
......
162244
162245
162246
162247
162248
162249
162250
162251
162252
162253
162254
162255
162256
162257
162258
......
162267
162268
162269
162270
162271
162272
162273
162274


162275
162276
162277
162278
162279
162280
162281
......
162292
162293
162294
162295
162296
162297
162298
162299

162300
162301
162302
162303
162304
162305
162306
162307
162308
162309
162310
162311
162312
162313
162314
162315
162316
162317
162318
162319
162320
162321
162322
162323
162324
162325
162326
162327
162328
162329
162330
162331
162332
162333
162334
162335
162336
162337
162338
162339
162340
162341
162342
162343
162344
162345
162346
162347
162348
162349
162350
162351
162352
162353
162354
162355
162356
162357
162358
162359
162360
162361
162362
162363
162364
162365
162366
162367
162368
162369
162370
162371
162372
162373
162374
162375
162376
162377
162378
162379
162380
162381
......
162415
162416
162417
162418
162419
162420
162421
162422
162423
162424
162425
162426
162427
162428
162429
162430
162431
162432
......
162645
162646
162647
162648
162649
162650
162651
162652
162653
162654
162655
162656
162657
162658


162659
162660
162661
162662
162663
162664
162665
......
162853
162854
162855
162856
162857
162858
162859







162860
162861
162862
162863
162864
162865
162866
......
163070
163071
163072
163073
163074
163075
163076
163077
163078
163079
163080
163081
163082
163083
163084
163085
163086
163087
163088
163089
163090
163091
163092
163093
163094
163095
163096
163097
......
163251
163252
163253
163254
163255
163256
163257













































































163258
163259
163260
163261
163262
163263
163264
......
163265
163266
163267
163268
163269
163270
163271
163272
163273
163274
163275
163276
163277
163278
163279
163280
163281
163282
163283
163284
163285
163286

163287
163288
163289
163290
163291
163292
163293
......
163313
163314
163315
163316
163317
163318
163319
163320
163321
163322
163323
163324
163325
163326
163327
163328
163329
163330
163331
163332
163333
163334
163335
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163353
163354



163355


163356
163357







163358
163359
163360
163361
163362
163363
163364
......
165081
165082
165083
165084
165085
165086
165087

165088
165089
165090
165091
165092
165093
165094
......
165812
165813
165814
165815
165816
165817
165818
















165819
165820
165821
165822
165823
165824
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......
165828
165829
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165832
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165839


165840
165841
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165844
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165854
......
166735
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166739
166740
166741

166742
166743
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166745
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166747
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......
166759
166760
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166762
166763
166764
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166766
166767
166768
166769
166770
166771




166772
166773
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166777
166778
......
167018
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167020
167021
167022
167023
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167026
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167028
167029
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167031
167032
......
170148
170149
170150
170151
170152
170153
170154

170155
170156
170157
170158
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170160
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......
171918
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171923
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171928
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171930
171931
171932
171933
171934
171935
......
174927
174928
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174930
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174932
174933
174934
174935
174936
174937
174938
174939
174940
174941
......
176450
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176454
176455
176456

176457
176458
176459
176460
176461
176462
176463
......
177537
177538
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177540
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177542
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177545
177546
177547
177548
177549
177550
177551
......
178103
178104
178105
178106
178107
178108
178109
178110
178111
178112
178113
178114
178115
178116
178117
178118
178119
178120
178121
178122
178123
178124
178125
178126
178127
178128
178129
178130
178131
......
179987
179988
179989
179990
179991
179992
179993






179994
179995
179996
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179998
179999
180000
......
181689
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181692
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181694
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181698
181699
181700
181701
181702
181703
......
183603
183604
183605
183606
183607
183608
183609

183610
183611
183612
183613
183614
183615
183616
......
189723
189724
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189727
189728
189729

189730

189731
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189734
189735
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189737
189738
......
192460
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192469
192470
192471
192472
192473
192474
......
192486
192487
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192494
192495
192496
192497
192498
192499
192500
192501
192502
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192504
192505
......
199293
199294
199295
199296
199297
199298
199299

199300
199301
199302
199303
199304
199305
199306
......
199507
199508
199509
199510
199511
199512
199513

199514

199515
199516
199517
199518
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199521
......
203840
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203843
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203851
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......
203923
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203934
203935
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203937
......
219969
219970
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219972
219973
219974
219975
219976
219977

219978
219979
219980
219981
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......
223609
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......
227352
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227358

227359
227360
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227364
227365
......
227634
227635
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227637
227638
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227640






227641
227642
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227651

227652
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227655

227656
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227661
227662
......
228251
228252
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228254
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228257

228258
228259
228260
228261
228262
228263
228264
228265
......
228382
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228395
/******************************************************************************
** This file is an amalgamation of many separate C source files from SQLite
** version 3.31.0.  By combining all the individual C code files into this
** single large file, the entire code can be compiled as a single translation
** unit.  This allows many compilers to do optimizations that would not be
** possible if the files were compiled separately.  Performance improvements
** of 5% or more are commonly seen when SQLite is compiled as a single
** translation unit.
**
** This file is all you need to compile SQLite.  To use SQLite in other
................................................................................
#endif
#if SQLITE_ENABLE_ATOMIC_WRITE
  "ENABLE_ATOMIC_WRITE",
#endif
#if SQLITE_ENABLE_BATCH_ATOMIC_WRITE
  "ENABLE_BATCH_ATOMIC_WRITE",
#endif



#if SQLITE_ENABLE_CEROD
  "ENABLE_CEROD=" CTIMEOPT_VAL(SQLITE_ENABLE_CEROD),
#endif
#if SQLITE_ENABLE_COLUMN_METADATA
  "ENABLE_COLUMN_METADATA",
#endif
#if SQLITE_ENABLE_COLUMN_USED_MASK
................................................................................
#endif
#if SQLITE_FTS5_ENABLE_TEST_MI
  "FTS5_ENABLE_TEST_MI",
#endif
#if SQLITE_FTS5_NO_WITHOUT_ROWID
  "FTS5_NO_WITHOUT_ROWID",
#endif
#if SQLITE_HAS_CODEC
  "HAS_CODEC",
#endif
#if HAVE_ISNAN || SQLITE_HAVE_ISNAN
  "HAVE_ISNAN",
#endif
#if SQLITE_HOMEGROWN_RECURSIVE_MUTEX
  "HOMEGROWN_RECURSIVE_MUTEX",
#endif
#if SQLITE_IGNORE_AFP_LOCK_ERRORS
................................................................................
#endif
#if SQLITE_OMIT_BETWEEN_OPTIMIZATION
  "OMIT_BETWEEN_OPTIMIZATION",
#endif
#if SQLITE_OMIT_BLOB_LITERAL
  "OMIT_BLOB_LITERAL",
#endif
#if SQLITE_OMIT_BTREECOUNT
  "OMIT_BTREECOUNT",
#endif
#if SQLITE_OMIT_CAST
  "OMIT_CAST",
#endif
#if SQLITE_OMIT_CHECK
  "OMIT_CHECK",
#endif
#if SQLITE_OMIT_COMPLETE
................................................................................
** been edited in any way since it was last checked in, then the last
** four hexadecimal digits of the hash may be modified.
**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.31.0"
#define SQLITE_VERSION_NUMBER 3031000
#define SQLITE_SOURCE_ID      "2020-01-18 14:50:06 fee945671a19a93287f9bfadc346f9821fb1311c7fc75b95a6a48d1419c840e7"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
................................................................................
**
** ^The sqlite3_close() and sqlite3_close_v2() routines are destructors
** for the [sqlite3] object.
** ^Calls to sqlite3_close() and sqlite3_close_v2() return [SQLITE_OK] if
** the [sqlite3] object is successfully destroyed and all associated
** resources are deallocated.
**
** ^If the database connection is associated with unfinalized prepared
** statements or unfinished sqlite3_backup objects then sqlite3_close()
** will leave the database connection open and return [SQLITE_BUSY].
** ^If sqlite3_close_v2() is called with unfinalized prepared statements
** and/or unfinished sqlite3_backups, then the database connection becomes
** an unusable "zombie" which will automatically be deallocated when the
** last prepared statement is finalized or the last sqlite3_backup is
** finished.  The sqlite3_close_v2() interface is intended for use with
** host languages that are garbage collected, and where the order in which
** destructors are called is arbitrary.
**
** Applications should [sqlite3_finalize | finalize] all [prepared statements],
** [sqlite3_blob_close | close] all [BLOB handles], and 
** [sqlite3_backup_finish | finish] all [sqlite3_backup] objects associated
** with the [sqlite3] object prior to attempting to close the object.  ^If
** sqlite3_close_v2() is called on a [database connection] that still has
** outstanding [prepared statements], [BLOB handles], and/or
** [sqlite3_backup] objects then it returns [SQLITE_OK] and the deallocation
** of resources is deferred until all [prepared statements], [BLOB handles],
** and [sqlite3_backup] objects are also destroyed.
**
** ^If an [sqlite3] object is destroyed while a transaction is open,
** the transaction is automatically rolled back.
**
** The C parameter to [sqlite3_close(C)] and [sqlite3_close_v2(C)]
** must be either a NULL
** pointer or an [sqlite3] object pointer obtained
................................................................................
#define SQLITE_IOERR_GETTEMPPATH       (SQLITE_IOERR | (25<<8))
#define SQLITE_IOERR_CONVPATH          (SQLITE_IOERR | (26<<8))
#define SQLITE_IOERR_VNODE             (SQLITE_IOERR | (27<<8))
#define SQLITE_IOERR_AUTH              (SQLITE_IOERR | (28<<8))
#define SQLITE_IOERR_BEGIN_ATOMIC      (SQLITE_IOERR | (29<<8))
#define SQLITE_IOERR_COMMIT_ATOMIC     (SQLITE_IOERR | (30<<8))
#define SQLITE_IOERR_ROLLBACK_ATOMIC   (SQLITE_IOERR | (31<<8))

#define SQLITE_LOCKED_SHAREDCACHE      (SQLITE_LOCKED |  (1<<8))
#define SQLITE_LOCKED_VTAB             (SQLITE_LOCKED |  (2<<8))
#define SQLITE_BUSY_RECOVERY           (SQLITE_BUSY   |  (1<<8))
#define SQLITE_BUSY_SNAPSHOT           (SQLITE_BUSY   |  (2<<8))

#define SQLITE_CANTOPEN_NOTEMPDIR      (SQLITE_CANTOPEN | (1<<8))
#define SQLITE_CANTOPEN_ISDIR          (SQLITE_CANTOPEN | (2<<8))
#define SQLITE_CANTOPEN_FULLPATH       (SQLITE_CANTOPEN | (3<<8))
#define SQLITE_CANTOPEN_CONVPATH       (SQLITE_CANTOPEN | (4<<8))
#define SQLITE_CANTOPEN_DIRTYWAL       (SQLITE_CANTOPEN | (5<<8)) /* Not Used */
#define SQLITE_CANTOPEN_SYMLINK        (SQLITE_CANTOPEN | (6<<8))
#define SQLITE_CORRUPT_VTAB            (SQLITE_CORRUPT | (1<<8))
#define SQLITE_CORRUPT_SEQUENCE        (SQLITE_CORRUPT | (2<<8))

#define SQLITE_READONLY_RECOVERY       (SQLITE_READONLY | (1<<8))
#define SQLITE_READONLY_CANTLOCK       (SQLITE_READONLY | (2<<8))
#define SQLITE_READONLY_ROLLBACK       (SQLITE_READONLY | (3<<8))
#define SQLITE_READONLY_DBMOVED        (SQLITE_READONLY | (4<<8))
#define SQLITE_READONLY_CANTINIT       (SQLITE_READONLY | (5<<8))
#define SQLITE_READONLY_DIRECTORY      (SQLITE_READONLY | (6<<8))
#define SQLITE_ABORT_ROLLBACK          (SQLITE_ABORT | (2<<8))
................................................................................
** [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] to be rolled back.
** ^This file control takes the file descriptor out of batch write mode
** so that all subsequent write operations are independent.
** ^SQLite will never invoke SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE without
** a prior successful call to [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE].
**
** <li>[[SQLITE_FCNTL_LOCK_TIMEOUT]]
** The [SQLITE_FCNTL_LOCK_TIMEOUT] opcode causes attempts to obtain

** a file lock using the xLock or xShmLock methods of the VFS to wait
** for up to M milliseconds before failing, where M is the single 
** unsigned integer parameter.


**
** <li>[[SQLITE_FCNTL_DATA_VERSION]]
** The [SQLITE_FCNTL_DATA_VERSION] opcode is used to detect changes to
** a database file.  The argument is a pointer to a 32-bit unsigned integer.
** The "data version" for the pager is written into the pointer.  The
** "data version" changes whenever any change occurs to the corresponding
** database file, either through SQL statements on the same database
................................................................................
** omits changes made by other database connections.  The
** [PRAGMA data_version] command provides a mechanism to detect changes to
** a single attached database that occur due to other database connections,
** but omits changes implemented by the database connection on which it is
** called.  This file control is the only mechanism to detect changes that
** happen either internally or externally and that are associated with
** a particular attached database.





**
** <li>[[SQLITE_FCNTL_CKPT_DONE]]
** The [SQLITE_FCNTL_CKPT_DONE] opcode is invoked from within a checkpoint
** in wal mode after the client has finished copying pages from the wal
** file to the database file, but before the *-shm file is updated to
** record the fact that the pages have been checkpointed.
** </ul>
................................................................................
#define SQLITE_FCNTL_BEGIN_ATOMIC_WRITE     31
#define SQLITE_FCNTL_COMMIT_ATOMIC_WRITE    32
#define SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE  33
#define SQLITE_FCNTL_LOCK_TIMEOUT           34
#define SQLITE_FCNTL_DATA_VERSION           35
#define SQLITE_FCNTL_SIZE_LIMIT             36
#define SQLITE_FCNTL_CKPT_DONE              37



/* deprecated names */
#define SQLITE_GET_LOCKPROXYFILE      SQLITE_FCNTL_GET_LOCKPROXYFILE
#define SQLITE_SET_LOCKPROXYFILE      SQLITE_FCNTL_SET_LOCKPROXYFILE
#define SQLITE_LAST_ERRNO             SQLITE_FCNTL_LAST_ERRNO


................................................................................
/*
** CAPI3REF: Obtain Values For URI Parameters
**
** These are utility routines, useful to [VFS|custom VFS implementations],
** that check if a database file was a URI that contained a specific query 
** parameter, and if so obtains the value of that query parameter.
**




** If F is the database filename pointer passed into the xOpen() method of 
** a VFS implementation or it is the return value of [sqlite3_db_filename()]








** and if P is the name of the query parameter, then
** sqlite3_uri_parameter(F,P) returns the value of the P
** parameter if it exists or a NULL pointer if P does not appear as a 
** query parameter on F.  If P is a query parameter of F and it
** has no explicit value, then sqlite3_uri_parameter(F,P) returns
** a pointer to an empty string.
**
................................................................................
** return value from [sqlite3_db_filename()], then the result is
** undefined and is likely a memory access violation.
*/
SQLITE_API const char *sqlite3_filename_database(const char*);
SQLITE_API const char *sqlite3_filename_journal(const char*);
SQLITE_API const char *sqlite3_filename_wal(const char*);










































































/*
** CAPI3REF: Error Codes And Messages
** METHOD: sqlite3
**
** ^If the most recent sqlite3_* API call associated with 
** [database connection] D failed, then the sqlite3_errcode(D) interface
................................................................................
** ^The leftmost SQL parameter has an index of 1.  ^When the same named
** SQL parameter is used more than once, second and subsequent
** occurrences have the same index as the first occurrence.
** ^The index for named parameters can be looked up using the
** [sqlite3_bind_parameter_index()] API if desired.  ^The index
** for "?NNN" parameters is the value of NNN.
** ^The NNN value must be between 1 and the [sqlite3_limit()]
** parameter [SQLITE_LIMIT_VARIABLE_NUMBER] (default value: 999).
**
** ^The third argument is the value to bind to the parameter.
** ^If the third parameter to sqlite3_bind_text() or sqlite3_bind_text16()
** or sqlite3_bind_blob() is a NULL pointer then the fourth parameter
** is ignored and the end result is the same as sqlite3_bind_null().


















**
** ^(In those routines that have a fourth argument, its value is the
** number of bytes in the parameter.  To be clear: the value is the
** number of <u>bytes</u> in the value, not the number of characters.)^
** ^If the fourth parameter to sqlite3_bind_text() or sqlite3_bind_text16()
** is negative, then the length of the string is
** the number of bytes up to the first zero terminator.
** If the fourth parameter to sqlite3_bind_blob() is negative, then
** the behavior is undefined.
** If a non-negative fourth parameter is provided to sqlite3_bind_text()
** or sqlite3_bind_text16() or sqlite3_bind_text64() then
** that parameter must be the byte offset
** where the NUL terminator would occur assuming the string were NUL
** terminated.  If any NUL characters occur at byte offsets less than 
** the value of the fourth parameter then the resulting string value will
** contain embedded NULs.  The result of expressions involving strings
** with embedded NULs is undefined.
**
** ^The fifth argument to the BLOB and string binding interfaces
** is a destructor used to dispose of the BLOB or
** string after SQLite has finished with it.  ^The destructor is called
................................................................................
** deterministic.  The built-in [random()] SQL function is an example of a
** function that is not deterministic.  The SQLite query planner is able to
** perform additional optimizations on deterministic functions, so use
** of the [SQLITE_DETERMINISTIC] flag is recommended where possible.
**
** ^The fourth parameter may also optionally include the [SQLITE_DIRECTONLY]
** flag, which if present prevents the function from being invoked from
** within VIEWs or TRIGGERs.  For security reasons, the [SQLITE_DIRECTONLY]




** flag is recommended for any application-defined SQL function that has
** side-effects.








**
** ^(The fifth parameter is an arbitrary pointer.  The implementation of the
** function can gain access to this pointer using [sqlite3_user_data()].)^
**
** ^The sixth, seventh and eighth parameters passed to the three
** "sqlite3_create_function*" functions, xFunc, xStep and xFinal, are
** pointers to C-language functions that implement the SQL function or
................................................................................
** <dl>
** [[SQLITE_DETERMINISTIC]] <dt>SQLITE_DETERMINISTIC</dt><dd>
** The SQLITE_DETERMINISTIC flag means that the new function always gives
** the same output when the input parameters are the same.
** The [abs|abs() function] is deterministic, for example, but
** [randomblob|randomblob()] is not.  Functions must
** be deterministic in order to be used in certain contexts such as
** [CHECK constraints] or [generated columns].  SQLite might also optimize
** deterministic functions by factoring them out of inner loops.

** </dd>
** 
** [[SQLITE_DIRECTONLY]] <dt>SQLITE_DIRECTONLY</dt><dd>
** The SQLITE_DIRECTONLY flag means that the function may only be invoked
** from top-level SQL, and cannot be used in VIEWs or TRIGGERs nor in 
** schema structures such as [CHECK constraints], [DEFAULT clauses],
** [expression indexes], [partial indexes], or [generated columns].  This is
** a security feature which is recommended for all 
** [application-defined SQL functions] that have side-effects or that
** could potentially leak sensitive information.

** </dd>
**
** [[SQLITE_INNOCUOUS]] <dt>SQLITE_INNOCUOUS</dt><dd>
** The SQLITE_INNOCUOUS flag means that the function is unlikely
** to cause problems even if misused.  An innocuous function should have
** no side effects and should not depend on any values other than its
** input parameters. The [abs|abs() function] is an example of an
................................................................................
**
** ^The sqlite3_aggregate_context(C,N) routine returns a NULL pointer 
** when first called if N is less than or equal to zero or if a memory
** allocate error occurs.
**
** ^(The amount of space allocated by sqlite3_aggregate_context(C,N) is
** determined by the N parameter on first successful call.  Changing the
** value of N in any subsequents call to sqlite3_aggregate_context() within
** the same aggregate function instance will not resize the memory
** allocation.)^  Within the xFinal callback, it is customary to set
** N=0 in calls to sqlite3_aggregate_context(C,N) so that no 
** pointless memory allocations occur.
**
** ^SQLite automatically frees the memory allocated by 
** sqlite3_aggregate_context() when the aggregate query concludes.
................................................................................
**
** ^The sqlite3_result_error() and sqlite3_result_error16() functions
** cause the implemented SQL function to throw an exception.
** ^SQLite uses the string pointed to by the
** 2nd parameter of sqlite3_result_error() or sqlite3_result_error16()
** as the text of an error message.  ^SQLite interprets the error
** message string from sqlite3_result_error() as UTF-8. ^SQLite
** interprets the string from sqlite3_result_error16() as UTF-16 in native

** byte order.  ^If the third parameter to sqlite3_result_error()
** or sqlite3_result_error16() is negative then SQLite takes as the error
** message all text up through the first zero character.
** ^If the third parameter to sqlite3_result_error() or
** sqlite3_result_error16() is non-negative then SQLite takes that many
** bytes (not characters) from the 2nd parameter as the error message.
** ^The sqlite3_result_error() and sqlite3_result_error16()
** routines make a private copy of the error message text before
................................................................................
** assumes that the text or BLOB result is in constant space and does not
** copy the content of the parameter nor call a destructor on the content
** when it has finished using that result.
** ^If the 4th parameter to the sqlite3_result_text* interfaces
** or sqlite3_result_blob is the special constant SQLITE_TRANSIENT
** then SQLite makes a copy of the result into space obtained
** from [sqlite3_malloc()] before it returns.



















**
** ^The sqlite3_result_value() interface sets the result of
** the application-defined function to be a copy of the
** [unprotected sqlite3_value] object specified by the 2nd parameter.  ^The
** sqlite3_result_value() interface makes a copy of the [sqlite3_value]
** so that the [sqlite3_value] specified in the parameter may change or
** be deallocated after sqlite3_result_value() returns without harm.
................................................................................
);
SQLITE_API int sqlite3_collation_needed16(
  sqlite3*, 
  void*,
  void(*)(void*,sqlite3*,int eTextRep,const void*)
);

#ifdef SQLITE_HAS_CODEC
/*
** Specify the key for an encrypted database.  This routine should be
** called right after sqlite3_open().
**
** The code to implement this API is not available in the public release
** of SQLite.
*/
SQLITE_API int sqlite3_key(
  sqlite3 *db,                   /* Database to be rekeyed */
  const void *pKey, int nKey     /* The key */
);
SQLITE_API int sqlite3_key_v2(
  sqlite3 *db,                   /* Database to be rekeyed */
  const char *zDbName,           /* Name of the database */
  const void *pKey, int nKey     /* The key */
);

/*
** Change the key on an open database.  If the current database is not
** encrypted, this routine will encrypt it.  If pNew==0 or nNew==0, the
** database is decrypted.
**
** The code to implement this API is not available in the public release
** of SQLite.
*/
SQLITE_API int sqlite3_rekey(
  sqlite3 *db,                   /* Database to be rekeyed */
  const void *pKey, int nKey     /* The new key */
);
SQLITE_API int sqlite3_rekey_v2(
  sqlite3 *db,                   /* Database to be rekeyed */
  const char *zDbName,           /* Name of the database */
  const void *pKey, int nKey     /* The new key */
);

/*
** Specify the activation key for a SEE database.  Unless 
** activated, none of the SEE routines will work.
*/
SQLITE_API void sqlite3_activate_see(
  const char *zPassPhrase        /* Activation phrase */
);
#endif

#ifdef SQLITE_ENABLE_CEROD
/*
** Specify the activation key for a CEROD database.  Unless 
** activated, none of the CEROD routines will work.
*/
SQLITE_API void sqlite3_activate_cerod(
  const char *zPassPhrase        /* Activation phrase */
................................................................................
#define SQLITE_TESTCTRL_PRNG_RESET               7  /* NOT USED */
#define SQLITE_TESTCTRL_BITVEC_TEST              8
#define SQLITE_TESTCTRL_FAULT_INSTALL            9
#define SQLITE_TESTCTRL_BENIGN_MALLOC_HOOKS     10
#define SQLITE_TESTCTRL_PENDING_BYTE            11
#define SQLITE_TESTCTRL_ASSERT                  12
#define SQLITE_TESTCTRL_ALWAYS                  13
#define SQLITE_TESTCTRL_RESERVE                 14
#define SQLITE_TESTCTRL_OPTIMIZATIONS           15
#define SQLITE_TESTCTRL_ISKEYWORD               16  /* NOT USED */
#define SQLITE_TESTCTRL_SCRATCHMALLOC           17  /* NOT USED */
#define SQLITE_TESTCTRL_INTERNAL_FUNCTIONS      17
#define SQLITE_TESTCTRL_LOCALTIME_FAULT         18
#define SQLITE_TESTCTRL_EXPLAIN_STMT            19  /* NOT USED */
#define SQLITE_TESTCTRL_ONCE_RESET_THRESHOLD    19
................................................................................
** This function may be called by either the [xConnect] or [xCreate] method
** of a [virtual table] implementation to configure
** various facets of the virtual table interface.
**
** If this interface is invoked outside the context of an xConnect or
** xCreate virtual table method then the behavior is undefined.
**
** At present, there is only one option that may be configured using
** this function. (See [SQLITE_VTAB_CONSTRAINT_SUPPORT].)  Further options
** may be added in the future.




*/
SQLITE_API int sqlite3_vtab_config(sqlite3*, int op, ...);

/*
** CAPI3REF: Virtual Table Configuration Options


**
** These macros define the various options to the
** [sqlite3_vtab_config()] interface that [virtual table] implementations
** can use to customize and optimize their behavior.
**
** <dl>
** [[SQLITE_VTAB_CONSTRAINT_SUPPORT]]
................................................................................
#ifndef SQLITE_MAX_ATTACHED
# define SQLITE_MAX_ATTACHED 10
#endif


/*
** The maximum value of a ?nnn wildcard that the parser will accept.



*/
#ifndef SQLITE_MAX_VARIABLE_NUMBER
# define SQLITE_MAX_VARIABLE_NUMBER 999
#endif

/* Maximum page size.  The upper bound on this value is 65536.  This a limit
** imposed by the use of 16-bit offsets within each page.
**
** Earlier versions of SQLite allowed the user to change this value at
** compile time. This is no longer permitted, on the grounds that it creates
................................................................................
#pragma warn -rch /* unreachable code */
#pragma warn -ccc /* Condition is always true or false */
#pragma warn -aus /* Assigned value is never used */
#pragma warn -csu /* Comparing signed and unsigned */
#pragma warn -spa /* Suspicious pointer arithmetic */
#endif
















/*
** Include standard header files as necessary
*/
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#ifdef HAVE_INTTYPES_H
................................................................................
** callback is currently invoked only from within pager.c.
*/
typedef struct BusyHandler BusyHandler;
struct BusyHandler {
  int (*xBusyHandler)(void *,int);  /* The busy callback */
  void *pBusyArg;                   /* First arg to busy callback */
  int nBusy;                        /* Incremented with each busy call */
  u8 bExtraFileArg;                 /* Include sqlite3_file as callback arg */
};

/*
** Name of the master database table.  The master database table
** is a special table that holds the names and attributes of all
** user tables and indices.
*/
................................................................................
#endif
SQLITE_PRIVATE int sqlite3BtreeSetPagerFlags(Btree*,unsigned);
SQLITE_PRIVATE int sqlite3BtreeSetPageSize(Btree *p, int nPagesize, int nReserve, int eFix);
SQLITE_PRIVATE int sqlite3BtreeGetPageSize(Btree*);
SQLITE_PRIVATE int sqlite3BtreeMaxPageCount(Btree*,int);
SQLITE_PRIVATE u32 sqlite3BtreeLastPage(Btree*);
SQLITE_PRIVATE int sqlite3BtreeSecureDelete(Btree*,int);
SQLITE_PRIVATE int sqlite3BtreeGetOptimalReserve(Btree*);
SQLITE_PRIVATE int sqlite3BtreeGetReserveNoMutex(Btree *p);
SQLITE_PRIVATE int sqlite3BtreeSetAutoVacuum(Btree *, int);
SQLITE_PRIVATE int sqlite3BtreeGetAutoVacuum(Btree *);
SQLITE_PRIVATE int sqlite3BtreeBeginTrans(Btree*,int,int*);
SQLITE_PRIVATE int sqlite3BtreeCommitPhaseOne(Btree*, const char *zMaster);
SQLITE_PRIVATE int sqlite3BtreeCommitPhaseTwo(Btree*, int);
SQLITE_PRIVATE int sqlite3BtreeCommit(Btree*);
................................................................................
SQLITE_PRIVATE int sqlite3HeaderSizeBtree(void);

#ifndef NDEBUG
SQLITE_PRIVATE int sqlite3BtreeCursorIsValid(BtCursor*);
#endif
SQLITE_PRIVATE int sqlite3BtreeCursorIsValidNN(BtCursor*);

#ifndef SQLITE_OMIT_BTREECOUNT
SQLITE_PRIVATE int sqlite3BtreeCount(sqlite3*, BtCursor*, i64*);
#endif

#ifdef SQLITE_TEST
SQLITE_PRIVATE int sqlite3BtreeCursorInfo(BtCursor*, int*, int);
SQLITE_PRIVATE void sqlite3BtreeCursorList(Btree*);
#endif

#ifndef SQLITE_OMIT_WAL
................................................................................
#define OP_Lt             56 /* jump, same as TK_LT, synopsis: IF r[P3]<r[P1] */
#define OP_Ge             57 /* jump, same as TK_GE, synopsis: IF r[P3]>=r[P1] */
#define OP_ElseNotEq      58 /* jump, same as TK_ESCAPE                    */
#define OP_DecrJumpZero   59 /* jump, synopsis: if (--r[P1])==0 goto P2    */
#define OP_IncrVacuum     60 /* jump                                       */
#define OP_VNext          61 /* jump                                       */
#define OP_Init           62 /* jump, synopsis: Start at P2                */
#define OP_PureFunc       63 /* synopsis: r[P3]=func(r[P2@P5])             */
#define OP_Function       64 /* synopsis: r[P3]=func(r[P2@P5])             */
#define OP_Return         65
#define OP_EndCoroutine   66
#define OP_HaltIfNull     67 /* synopsis: if r[P3]=null halt               */
#define OP_Halt           68
#define OP_Integer        69 /* synopsis: r[P2]=P1                         */
#define OP_Int64          70 /* synopsis: r[P2]=P4                         */
#define OP_String         71 /* synopsis: r[P2]='P4' (len=P1)              */
................................................................................
#define OP_ResetCount    123
#define OP_SorterCompare 124 /* synopsis: if key(P1)!=trim(r[P3],P4) goto P2 */
#define OP_SorterData    125 /* synopsis: r[P2]=data                       */
#define OP_RowData       126 /* synopsis: r[P2]=data                       */
#define OP_Rowid         127 /* synopsis: r[P2]=rowid                      */
#define OP_NullRow       128
#define OP_SeekEnd       129
#define OP_SorterInsert  130 /* synopsis: key=r[P2]                        */
#define OP_IdxInsert     131 /* synopsis: key=r[P2]                        */
#define OP_IdxDelete     132 /* synopsis: key=r[P2@P3]                     */
#define OP_DeferredSeek  133 /* synopsis: Move P3 to P1.rowid if needed    */
#define OP_IdxRowid      134 /* synopsis: r[P2]=rowid                      */
#define OP_FinishSeek    135
#define OP_Destroy       136
#define OP_Clear         137
#define OP_ResetSorter   138
................................................................................
SQLITE_PRIVATE void sqlite3VdbeAddParseSchemaOp(Vdbe*,int,char*);
SQLITE_PRIVATE void sqlite3VdbeChangeOpcode(Vdbe*, int addr, u8);
SQLITE_PRIVATE void sqlite3VdbeChangeP1(Vdbe*, int addr, int P1);
SQLITE_PRIVATE void sqlite3VdbeChangeP2(Vdbe*, int addr, int P2);
SQLITE_PRIVATE void sqlite3VdbeChangeP3(Vdbe*, int addr, int P3);
SQLITE_PRIVATE void sqlite3VdbeChangeP5(Vdbe*, u16 P5);
SQLITE_PRIVATE void sqlite3VdbeJumpHere(Vdbe*, int addr);

SQLITE_PRIVATE int sqlite3VdbeChangeToNoop(Vdbe*, int addr);
SQLITE_PRIVATE int sqlite3VdbeDeletePriorOpcode(Vdbe*, u8 op);
#ifdef SQLITE_DEBUG
SQLITE_PRIVATE   void sqlite3VdbeReleaseRegisters(Parse*,int addr, int n, u32 mask, int);
#else
# define sqlite3VdbeReleaseRegisters(P,A,N,M,F)
#endif
................................................................................
typedef int (*RecordCompare)(int,const void*,UnpackedRecord*);
SQLITE_PRIVATE RecordCompare sqlite3VdbeFindCompare(UnpackedRecord*);

SQLITE_PRIVATE void sqlite3VdbeLinkSubProgram(Vdbe *, SubProgram *);
SQLITE_PRIVATE int sqlite3VdbeHasSubProgram(Vdbe*);

SQLITE_PRIVATE int sqlite3NotPureFunc(sqlite3_context*);




/* Use SQLITE_ENABLE_COMMENTS to enable generation of extra comments on
** each VDBE opcode.
**
** Use the SQLITE_ENABLE_MODULE_COMMENTS macro to see some extra no-op
** comments in VDBE programs that show key decision points in the code
** generator.
................................................................................
);
SQLITE_PRIVATE int sqlite3PagerClose(Pager *pPager, sqlite3*);
SQLITE_PRIVATE int sqlite3PagerReadFileheader(Pager*, int, unsigned char*);

/* Functions used to configure a Pager object. */
SQLITE_PRIVATE void sqlite3PagerSetBusyHandler(Pager*, int(*)(void *), void *);
SQLITE_PRIVATE int sqlite3PagerSetPagesize(Pager*, u32*, int);
#ifdef SQLITE_HAS_CODEC
SQLITE_PRIVATE void sqlite3PagerAlignReserve(Pager*,Pager*);
#endif
SQLITE_PRIVATE int sqlite3PagerMaxPageCount(Pager*, int);
SQLITE_PRIVATE void sqlite3PagerSetCachesize(Pager*, int);
SQLITE_PRIVATE int sqlite3PagerSetSpillsize(Pager*, int);
SQLITE_PRIVATE void sqlite3PagerSetMmapLimit(Pager *, sqlite3_int64);
SQLITE_PRIVATE void sqlite3PagerShrink(Pager*);
SQLITE_PRIVATE void sqlite3PagerSetFlags(Pager*,unsigned);
SQLITE_PRIVATE int sqlite3PagerLockingMode(Pager *, int);
................................................................................
#ifndef SQLITE_OMIT_WAL
SQLITE_PRIVATE   int sqlite3PagerCheckpoint(Pager *pPager, sqlite3*, int, int*, int*);
SQLITE_PRIVATE   int sqlite3PagerWalSupported(Pager *pPager);
SQLITE_PRIVATE   int sqlite3PagerWalCallback(Pager *pPager);
SQLITE_PRIVATE   int sqlite3PagerOpenWal(Pager *pPager, int *pisOpen);
SQLITE_PRIVATE   int sqlite3PagerCloseWal(Pager *pPager, sqlite3*);
# ifdef SQLITE_ENABLE_SNAPSHOT
SQLITE_PRIVATE   int sqlite3PagerSnapshotGet(Pager *pPager, sqlite3_snapshot **ppSnapshot);
SQLITE_PRIVATE   int sqlite3PagerSnapshotOpen(Pager *pPager, sqlite3_snapshot *pSnapshot);
SQLITE_PRIVATE   int sqlite3PagerSnapshotRecover(Pager *pPager);
SQLITE_PRIVATE   int sqlite3PagerSnapshotCheck(Pager *pPager, sqlite3_snapshot *pSnapshot);
SQLITE_PRIVATE   void sqlite3PagerSnapshotUnlock(Pager *pPager);
# endif
#endif









#ifdef SQLITE_DIRECT_OVERFLOW_READ
SQLITE_PRIVATE   int sqlite3PagerDirectReadOk(Pager *pPager, Pgno pgno);
#endif

#ifdef SQLITE_ENABLE_ZIPVFS
SQLITE_PRIVATE   int sqlite3PagerWalFramesize(Pager *pPager);
................................................................................
SQLITE_PRIVATE sqlite3_file *sqlite3PagerJrnlFile(Pager*);
SQLITE_PRIVATE const char *sqlite3PagerJournalname(Pager*);
SQLITE_PRIVATE void *sqlite3PagerTempSpace(Pager*);
SQLITE_PRIVATE int sqlite3PagerIsMemdb(Pager*);
SQLITE_PRIVATE void sqlite3PagerCacheStat(Pager *, int, int, int *);
SQLITE_PRIVATE void sqlite3PagerClearCache(Pager*);
SQLITE_PRIVATE int sqlite3SectorSize(sqlite3_file *);
#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
SQLITE_PRIVATE void sqlite3PagerResetLockTimeout(Pager *pPager);
#else
# define sqlite3PagerResetLockTimeout(X)
#endif

/* Functions used to truncate the database file. */
SQLITE_PRIVATE void sqlite3PagerTruncateImage(Pager*,Pgno);

SQLITE_PRIVATE void sqlite3PagerRekey(DbPage*, Pgno, u16);

#if defined(SQLITE_HAS_CODEC) && !defined(SQLITE_OMIT_WAL)
SQLITE_PRIVATE void *sqlite3PagerCodec(DbPage *);
#endif

/* Functions to support testing and debugging. */
#if !defined(NDEBUG) || defined(SQLITE_TEST)
SQLITE_PRIVATE   Pgno sqlite3PagerPagenumber(DbPage*);
SQLITE_PRIVATE   int sqlite3PagerIswriteable(DbPage*);
#endif
#ifdef SQLITE_TEST
SQLITE_PRIVATE   int *sqlite3PagerStats(Pager*);
................................................................................
**
** DB_UnresetViews means that one or more views have column names that
** have been filled out.  If the schema changes, these column names might
** changes and so the view will need to be reset.
*/
#define DB_SchemaLoaded    0x0001  /* The schema has been loaded */
#define DB_UnresetViews    0x0002  /* Some views have defined column names */
#define DB_Empty           0x0004  /* The file is empty (length 0 bytes) */
#define DB_ResetWanted     0x0008  /* Reset the schema when nSchemaLock==0 */

/*
** The number of different kinds of things that can be limited
** using the sqlite3_limit() interface.
*/
#define SQLITE_N_LIMIT (SQLITE_LIMIT_WORKER_THREADS+1)
................................................................................

/*
** Each database connection is an instance of the following structure.
*/
struct sqlite3 {
  sqlite3_vfs *pVfs;            /* OS Interface */
  struct Vdbe *pVdbe;           /* List of active virtual machines */
  CollSeq *pDfltColl;           /* The default collating sequence (BINARY) */
  sqlite3_mutex *mutex;         /* Connection mutex */
  Db *aDb;                      /* All backends */
  int nDb;                      /* Number of backends currently in use */
  u32 mDbFlags;                 /* flags recording internal state */
  u64 flags;                    /* flags settable by pragmas. See below */
  i64 lastRowid;                /* ROWID of most recent insert (see above) */
  i64 szMmap;                   /* Default mmap_size setting */
................................................................................
  VTable *pDisconnect;          /* Disconnect these in next sqlite3_prepare() */
#endif
  Hash aFunc;                   /* Hash table of connection functions */
  Hash aCollSeq;                /* All collating sequences */
  BusyHandler busyHandler;      /* Busy callback */
  Db aDbStatic[2];              /* Static space for the 2 default backends */
  Savepoint *pSavepoint;        /* List of active savepoints */

  int busyTimeout;              /* Busy handler timeout, in msec */
  int nSavepoint;               /* Number of non-transaction savepoints */
  int nStatement;               /* Number of nested statement-transactions  */
  i64 nDeferredCons;            /* Net deferred constraints this transaction. */
  i64 nDeferredImmCons;         /* Net deferred immediate constraints */
  int *pnBytesFreed;            /* If not NULL, increment this in DbFree() */
#ifdef SQLITE_ENABLE_UNLOCK_NOTIFY
................................................................................
*/
#define DBFLAG_SchemaChange   0x0001  /* Uncommitted Hash table changes */
#define DBFLAG_PreferBuiltin  0x0002  /* Preference to built-in funcs */
#define DBFLAG_Vacuum         0x0004  /* Currently in a VACUUM */
#define DBFLAG_VacuumInto     0x0008  /* Currently running VACUUM INTO */
#define DBFLAG_SchemaKnownOk  0x0010  /* Schema is known to be valid */
#define DBFLAG_InternalFunc   0x0020  /* Allow use of internal functions */


/*
** Bits of the sqlite3.dbOptFlags field that are used by the
** sqlite3_test_control(SQLITE_TESTCTRL_OPTIMIZATIONS,...) interface to
** selectively disable various optimizations.
*/
#define SQLITE_QueryFlattener 0x0001   /* Query flattening */
................................................................................
#define SQLITE_FUNC_LIKE     0x0004 /* Candidate for the LIKE optimization */
#define SQLITE_FUNC_CASE     0x0008 /* Case-sensitive LIKE-type function */
#define SQLITE_FUNC_EPHEM    0x0010 /* Ephemeral.  Delete with VDBE */
#define SQLITE_FUNC_NEEDCOLL 0x0020 /* sqlite3GetFuncCollSeq() might be called*/
#define SQLITE_FUNC_LENGTH   0x0040 /* Built-in length() function */
#define SQLITE_FUNC_TYPEOF   0x0080 /* Built-in typeof() function */
#define SQLITE_FUNC_COUNT    0x0100 /* Built-in count(*) aggregate */
#define SQLITE_FUNC_COALESCE 0x0200 /* Built-in coalesce() or ifnull() */
#define SQLITE_FUNC_UNLIKELY 0x0400 /* Built-in unlikely() function */
#define SQLITE_FUNC_CONSTANT 0x0800 /* Constant inputs give a constant output */
#define SQLITE_FUNC_MINMAX   0x1000 /* True for min() and max() aggregates */
#define SQLITE_FUNC_SLOCHNG  0x2000 /* "Slow Change". Value constant during a
                                    ** single query - might change over time */
#define SQLITE_FUNC_TEST     0x4000 /* Built-in testing functions */
#define SQLITE_FUNC_OFFSET   0x8000 /* Built-in sqlite_offset() function */
................................................................................

/* Identifier numbers for each in-line function */
#define INLINEFUNC_coalesce             0
#define INLINEFUNC_implies_nonnull_row  1
#define INLINEFUNC_expr_implies_expr    2
#define INLINEFUNC_expr_compare         3      
#define INLINEFUNC_affinity             4

#define INLINEFUNC_unlikely            99  /* Default case */

/*
** The following three macros, FUNCTION(), LIKEFUNC() and AGGREGATE() are
** used to create the initializers for the FuncDef structures.
**
**   FUNCTION(zName, nArg, iArg, bNC, xFunc)
................................................................................
struct Column {
  char *zName;     /* Name of this column, \000, then the type */
  Expr *pDflt;     /* Default value or GENERATED ALWAYS AS value */
  char *zColl;     /* Collating sequence.  If NULL, use the default */
  u8 notNull;      /* An OE_ code for handling a NOT NULL constraint */
  char affinity;   /* One of the SQLITE_AFF_... values */
  u8 szEst;        /* Estimated size of value in this column. sizeof(INT)==1 */

  u16 colFlags;    /* Boolean properties.  See COLFLAG_ defines below */
};

/* Allowed values for Column.colFlags:
*/
#define COLFLAG_PRIMKEY   0x0001   /* Column is part of the primary key */
#define COLFLAG_HIDDEN    0x0002   /* A hidden column in a virtual table */
................................................................................
/*
** Test to see whether or not a table is a virtual table.  This is
** done as a macro so that it will be optimized out when virtual
** table support is omitted from the build.
*/
#ifndef SQLITE_OMIT_VIRTUALTABLE
#  define IsVirtual(X)      ((X)->nModuleArg)


#else
#  define IsVirtual(X)      0

#endif

/*
** Macros to determine if a column is hidden.  IsOrdinaryHiddenColumn()
** only works for non-virtual tables (ordinary tables and views) and is
** always false unless SQLITE_ENABLE_HIDDEN_COLUMNS is defined.  The
** IsHiddenColumn() macro is general purpose.
................................................................................
/*
** The datatype ynVar is a signed integer, either 16-bit or 32-bit.
** Usually it is 16-bits.  But if SQLITE_MAX_VARIABLE_NUMBER is greater
** than 32767 we have to make it 32-bit.  16-bit is preferred because
** it uses less memory in the Expr object, which is a big memory user
** in systems with lots of prepared statements.  And few applications
** need more than about 10 or 20 variables.  But some extreme users want
** to have prepared statements with over 32767 variables, and for them
** the option is available (at compile-time).
*/
#if SQLITE_MAX_VARIABLE_NUMBER<=32767
typedef i16 ynVar;
#else
typedef int ynVar;
#endif

/*
** Each node of an expression in the parse tree is an instance
................................................................................
struct Expr {
  u8 op;                 /* Operation performed by this node */
  char affExpr;          /* affinity, or RAISE type */
  u8 op2;                /* TK_REGISTER/TK_TRUTH: original value of Expr.op
                         ** TK_COLUMN: the value of p5 for OP_Column
                         ** TK_AGG_FUNCTION: nesting depth
                         ** TK_FUNCTION: NC_SelfRef flag if needs OP_PureFunc */



  u32 flags;             /* Various flags.  EP_* See below */
  union {
    char *zToken;          /* Token value. Zero terminated and dequoted */
    int iValue;            /* Non-negative integer value if EP_IntValue */
  } u;

  /* If the EP_TokenOnly flag is set in the Expr.flags mask, then no
................................................................................
#define EP_IntValue   0x000400 /* Integer value contained in u.iValue */
#define EP_xIsSelect  0x000800 /* x.pSelect is valid (otherwise x.pList is) */
#define EP_Skip       0x001000 /* Operator does not contribute to affinity */
#define EP_Reduced    0x002000 /* Expr struct EXPR_REDUCEDSIZE bytes only */
#define EP_TokenOnly  0x004000 /* Expr struct EXPR_TOKENONLYSIZE bytes only */
#define EP_Win        0x008000 /* Contains window functions */
#define EP_MemToken   0x010000 /* Need to sqlite3DbFree() Expr.zToken */
#define EP_NoReduce   0x020000 /* Cannot EXPRDUP_REDUCE this Expr */
#define EP_Unlikely   0x040000 /* unlikely() or likelihood() function */
#define EP_ConstFunc  0x080000 /* A SQLITE_FUNC_CONSTANT or _SLOCHNG function */
#define EP_CanBeNull  0x100000 /* Can be null despite NOT NULL constraint */
#define EP_Subquery   0x200000 /* Tree contains a TK_SELECT operator */
#define EP_Alias      0x400000 /* Is an alias for a result set column */
#define EP_Leaf       0x800000 /* Expr.pLeft, .pRight, .u.pSelect all NULL */
#define EP_WinFunc   0x1000000 /* TK_FUNCTION with Expr.y.pWin set */
#define EP_Subrtn    0x2000000 /* Uses Expr.y.sub. TK_IN, _SELECT, or _EXISTS */
#define EP_Quoted    0x4000000 /* TK_ID was originally quoted */
#define EP_Static    0x8000000 /* Held in memory not obtained from malloc() */
#define EP_IsTrue   0x10000000 /* Always has boolean value of TRUE */
#define EP_IsFalse  0x20000000 /* Always has boolean value of FALSE */
#define EP_FromDDL  0x40000000 /* Originates from sqlite_master */


/*
** The EP_Propagate mask is a set of properties that automatically propagate
** upwards into parent nodes.
*/
#define EP_Propagate (EP_Collate|EP_Subquery|EP_HasFunc)

................................................................................
#define ExprHasProperty(E,P)     (((E)->flags&(P))!=0)
#define ExprHasAllProperty(E,P)  (((E)->flags&(P))==(P))
#define ExprSetProperty(E,P)     (E)->flags|=(P)
#define ExprClearProperty(E,P)   (E)->flags&=~(P)
#define ExprAlwaysTrue(E)   (((E)->flags&(EP_FromJoin|EP_IsTrue))==EP_IsTrue)
#define ExprAlwaysFalse(E)  (((E)->flags&(EP_FromJoin|EP_IsFalse))==EP_IsFalse)







/* The ExprSetVVAProperty() macro is used for Verification, Validation,
** and Accreditation only.  It works like ExprSetProperty() during VVA
** processes but is a no-op for delivery.
*/
#ifdef SQLITE_DEBUG
# define ExprSetVVAProperty(E,P)  (E)->flags|=(P)


#else
# define ExprSetVVAProperty(E,P)


#endif

/*
** Macros to determine the number of bytes required by a normal Expr
** struct, an Expr struct with the EP_Reduced flag set in Expr.flags
** and an Expr struct with the EP_TokenOnly flag set.
*/
................................................................................
    struct IdxExprTrans *pIdxTrans;           /* Convert idxed expr to column */
    ExprList *pGroupBy;                       /* GROUP BY clause */
    Select *pSelect;                          /* HAVING to WHERE clause ctx */
    struct WindowRewrite *pRewrite;           /* Window rewrite context */
    struct WhereConst *pConst;                /* WHERE clause constants */
    struct RenameCtx *pRename;                /* RENAME COLUMN context */
    struct Table *pTab;                       /* Table of generated column */

  } u;
};

/* Forward declarations */
SQLITE_PRIVATE int sqlite3WalkExpr(Walker*, Expr*);
SQLITE_PRIVATE int sqlite3WalkExprList(Walker*, ExprList*);
SQLITE_PRIVATE int sqlite3WalkSelect(Walker*, Select*);
................................................................................
SQLITE_PRIVATE int sqlite3CantopenError(int);
#define SQLITE_CORRUPT_BKPT sqlite3CorruptError(__LINE__)
#define SQLITE_MISUSE_BKPT sqlite3MisuseError(__LINE__)
#define SQLITE_CANTOPEN_BKPT sqlite3CantopenError(__LINE__)
#ifdef SQLITE_DEBUG
SQLITE_PRIVATE   int sqlite3NomemError(int);
SQLITE_PRIVATE   int sqlite3IoerrnomemError(int);
SQLITE_PRIVATE   int sqlite3CorruptPgnoError(int,Pgno);
# define SQLITE_NOMEM_BKPT sqlite3NomemError(__LINE__)
# define SQLITE_IOERR_NOMEM_BKPT sqlite3IoerrnomemError(__LINE__)
# define SQLITE_CORRUPT_PGNO(P) sqlite3CorruptPgnoError(__LINE__,(P))
#else
# define SQLITE_NOMEM_BKPT SQLITE_NOMEM
# define SQLITE_IOERR_NOMEM_BKPT SQLITE_IOERR_NOMEM





# define SQLITE_CORRUPT_PGNO(P) sqlite3CorruptError(__LINE__)
#endif

/*
** FTS3 and FTS4 both require virtual table support
*/
#if defined(SQLITE_OMIT_VIRTUALTABLE)
................................................................................
SQLITE_PRIVATE void sqlite3AddCheckConstraint(Parse*, Expr*);
SQLITE_PRIVATE void sqlite3AddDefaultValue(Parse*,Expr*,const char*,const char*);
SQLITE_PRIVATE void sqlite3AddCollateType(Parse*, Token*);
SQLITE_PRIVATE void sqlite3AddGenerated(Parse*,Expr*,Token*);
SQLITE_PRIVATE void sqlite3EndTable(Parse*,Token*,Token*,u8,Select*);
SQLITE_PRIVATE int sqlite3ParseUri(const char*,const char*,unsigned int*,
                    sqlite3_vfs**,char**,char **);
#ifdef SQLITE_HAS_CODEC
SQLITE_PRIVATE   int sqlite3CodecQueryParameters(sqlite3*,const char*,const char*);
#else
# define sqlite3CodecQueryParameters(A,B,C) 0
#endif
SQLITE_PRIVATE Btree *sqlite3DbNameToBtree(sqlite3*,const char*);

#ifdef SQLITE_UNTESTABLE
# define sqlite3FaultSim(X) SQLITE_OK
#else
SQLITE_PRIVATE   int sqlite3FaultSim(int);
#endif
................................................................................
SQLITE_PRIVATE void sqlite3ExprCodeMove(Parse*, int, int, int);
SQLITE_PRIVATE void sqlite3ExprCode(Parse*, Expr*, int);
#ifndef SQLITE_OMIT_GENERATED_COLUMNS
SQLITE_PRIVATE void sqlite3ExprCodeGeneratedColumn(Parse*, Column*, int);
#endif
SQLITE_PRIVATE void sqlite3ExprCodeCopy(Parse*, Expr*, int);
SQLITE_PRIVATE void sqlite3ExprCodeFactorable(Parse*, Expr*, int);
SQLITE_PRIVATE int sqlite3ExprCodeAtInit(Parse*, Expr*, int);
SQLITE_PRIVATE int sqlite3ExprCodeTemp(Parse*, Expr*, int*);
SQLITE_PRIVATE int sqlite3ExprCodeTarget(Parse*, Expr*, int);
SQLITE_PRIVATE int sqlite3ExprCodeExprList(Parse*, ExprList*, int, int, u8);
#define SQLITE_ECEL_DUP      0x01  /* Deep, not shallow copies */
#define SQLITE_ECEL_FACTOR   0x02  /* Factor out constant terms */
#define SQLITE_ECEL_REF      0x04  /* Use ExprList.u.x.iOrderByCol */
#define SQLITE_ECEL_OMITREF  0x08  /* Omit if ExprList.u.x.iOrderByCol */
................................................................................
SQLITE_PRIVATE   int sqlite3AuthReadCol(Parse*, const char *, const char *, int);
#else
# define sqlite3AuthRead(a,b,c,d)
# define sqlite3AuthCheck(a,b,c,d,e)    SQLITE_OK
# define sqlite3AuthContextPush(a,b,c)
# define sqlite3AuthContextPop(a)  ((void)(a))
#endif

SQLITE_PRIVATE void sqlite3Attach(Parse*, Expr*, Expr*, Expr*);
SQLITE_PRIVATE void sqlite3Detach(Parse*, Expr*);
SQLITE_PRIVATE void sqlite3FixInit(DbFixer*, Parse*, int, const char*, const Token*);
SQLITE_PRIVATE int sqlite3FixSrcList(DbFixer*, SrcList*);
SQLITE_PRIVATE int sqlite3FixSelect(DbFixer*, Select*);
SQLITE_PRIVATE int sqlite3FixExpr(DbFixer*, Expr*);
SQLITE_PRIVATE int sqlite3FixExprList(DbFixer*, ExprList*);
................................................................................
/*
** The common case is for a varint to be a single byte.  They following
** macros handle the common case without a procedure call, but then call
** the procedure for larger varints.
*/
#define getVarint32(A,B)  \
  (u8)((*(A)<(u8)0x80)?((B)=(u32)*(A)),1:sqlite3GetVarint32((A),(u32 *)&(B)))


#define putVarint32(A,B)  \
  (u8)(((u32)(B)<(u32)0x80)?(*(A)=(unsigned char)(B)),1:\
  sqlite3PutVarint((A),(B)))
#define getVarint    sqlite3GetVarint
#define putVarint    sqlite3PutVarint


SQLITE_PRIVATE const char *sqlite3IndexAffinityStr(sqlite3*, Index*);
SQLITE_PRIVATE void sqlite3TableAffinity(Vdbe*, Table*, int);
SQLITE_PRIVATE char sqlite3CompareAffinity(Expr *pExpr, char aff2);
SQLITE_PRIVATE int sqlite3IndexAffinityOk(Expr *pExpr, char idx_affinity);
SQLITE_PRIVATE char sqlite3TableColumnAffinity(Table*,int);
SQLITE_PRIVATE char sqlite3ExprAffinity(Expr *pExpr);
SQLITE_PRIVATE int sqlite3Atoi64(const char*, i64*, int, u8);
SQLITE_PRIVATE int sqlite3DecOrHexToI64(const char*, i64*);
SQLITE_PRIVATE void sqlite3ErrorWithMsg(sqlite3*, int, const char*,...);
SQLITE_PRIVATE void sqlite3Error(sqlite3*,int);
SQLITE_PRIVATE void sqlite3SystemError(sqlite3*,int);
SQLITE_PRIVATE void *sqlite3HexToBlob(sqlite3*, const char *z, int n);
SQLITE_PRIVATE u8 sqlite3HexToInt(int h);
................................................................................
#endif

SQLITE_PRIVATE const char *sqlite3ErrStr(int);
SQLITE_PRIVATE int sqlite3ReadSchema(Parse *pParse);
SQLITE_PRIVATE CollSeq *sqlite3FindCollSeq(sqlite3*,u8 enc, const char*,int);
SQLITE_PRIVATE int sqlite3IsBinary(const CollSeq*);
SQLITE_PRIVATE CollSeq *sqlite3LocateCollSeq(Parse *pParse, const char*zName);

SQLITE_PRIVATE CollSeq *sqlite3ExprCollSeq(Parse *pParse, Expr *pExpr);
SQLITE_PRIVATE CollSeq *sqlite3ExprNNCollSeq(Parse *pParse, Expr *pExpr);
SQLITE_PRIVATE int sqlite3ExprCollSeqMatch(Parse*,Expr*,Expr*);
SQLITE_PRIVATE Expr *sqlite3ExprAddCollateToken(Parse *pParse, Expr*, const Token*, int);
SQLITE_PRIVATE Expr *sqlite3ExprAddCollateString(Parse*,Expr*,const char*);
SQLITE_PRIVATE Expr *sqlite3ExprSkipCollate(Expr*);
SQLITE_PRIVATE Expr *sqlite3ExprSkipCollateAndLikely(Expr*);
SQLITE_PRIVATE int sqlite3CheckCollSeq(Parse *, CollSeq *);
SQLITE_PRIVATE int sqlite3WritableSchema(sqlite3*);
SQLITE_PRIVATE int sqlite3CheckObjectName(Parse*, const char*,const char*,const char*);
................................................................................
SQLITE_PRIVATE void sqlite3SelectWrongNumTermsError(Parse *pParse, Select *p);
SQLITE_PRIVATE int sqlite3MatchEName(
  const struct ExprList_item*,
  const char*,
  const char*,
  const char*
);


SQLITE_PRIVATE int sqlite3ResolveExprNames(NameContext*, Expr*);
SQLITE_PRIVATE int sqlite3ResolveExprListNames(NameContext*, ExprList*);
SQLITE_PRIVATE void sqlite3ResolveSelectNames(Parse*, Select*, NameContext*);
SQLITE_PRIVATE int sqlite3ResolveSelfReference(Parse*,Table*,int,Expr*,ExprList*);
SQLITE_PRIVATE int sqlite3ResolveOrderGroupBy(Parse*, Select*, ExprList*, const char*);
SQLITE_PRIVATE void sqlite3ColumnDefault(Vdbe *, Table *, int, int);
SQLITE_PRIVATE void sqlite3AlterFinishAddColumn(Parse *, Token *);
................................................................................
SQLITE_PRIVATE void *sqlite3RenameTokenMap(Parse*, void*, Token*);
SQLITE_PRIVATE void sqlite3RenameTokenRemap(Parse*, void *pTo, void *pFrom);
SQLITE_PRIVATE void sqlite3RenameExprUnmap(Parse*, Expr*);
SQLITE_PRIVATE void sqlite3RenameExprlistUnmap(Parse*, ExprList*);
SQLITE_PRIVATE CollSeq *sqlite3GetCollSeq(Parse*, u8, CollSeq *, const char*);
SQLITE_PRIVATE char sqlite3AffinityType(const char*, Column*);
SQLITE_PRIVATE void sqlite3Analyze(Parse*, Token*, Token*);
SQLITE_PRIVATE int sqlite3InvokeBusyHandler(BusyHandler*, sqlite3_file*);
SQLITE_PRIVATE int sqlite3FindDb(sqlite3*, Token*);
SQLITE_PRIVATE int sqlite3FindDbName(sqlite3 *, const char *);
SQLITE_PRIVATE int sqlite3AnalysisLoad(sqlite3*,int iDB);
SQLITE_PRIVATE void sqlite3DeleteIndexSamples(sqlite3*,Index*);
SQLITE_PRIVATE void sqlite3DefaultRowEst(Index*);
SQLITE_PRIVATE void sqlite3RegisterLikeFunctions(sqlite3*, int);
SQLITE_PRIVATE int sqlite3IsLikeFunction(sqlite3*,Expr*,int*,char*);
................................................................................
     void(*)(void*)
   );
#  define sqlite3VtabInSync(db) ((db)->nVTrans>0 && (db)->aVTrans==0)
#endif
SQLITE_PRIVATE int sqlite3ReadOnlyShadowTables(sqlite3 *db);
#ifndef SQLITE_OMIT_VIRTUALTABLE
SQLITE_PRIVATE   int sqlite3ShadowTableName(sqlite3 *db, const char *zName);

#else
# define sqlite3ShadowTableName(A,B) 0

#endif
SQLITE_PRIVATE int sqlite3VtabEponymousTableInit(Parse*,Module*);
SQLITE_PRIVATE void sqlite3VtabEponymousTableClear(sqlite3*,Module*);
SQLITE_PRIVATE void sqlite3VtabMakeWritable(Parse*,Table*);
SQLITE_PRIVATE void sqlite3VtabBeginParse(Parse*, Token*, Token*, Token*, int);
SQLITE_PRIVATE void sqlite3VtabFinishParse(Parse*, Token*);
SQLITE_PRIVATE void sqlite3VtabArgInit(Parse*);
................................................................................
SQLITE_PRIVATE int sqlite3TransferBindings(sqlite3_stmt *, sqlite3_stmt *);
SQLITE_PRIVATE void sqlite3ParserReset(Parse*);
#ifdef SQLITE_ENABLE_NORMALIZE
SQLITE_PRIVATE char *sqlite3Normalize(Vdbe*, const char*);
#endif
SQLITE_PRIVATE int sqlite3Reprepare(Vdbe*);
SQLITE_PRIVATE void sqlite3ExprListCheckLength(Parse*, ExprList*, const char*);
SQLITE_PRIVATE CollSeq *sqlite3ExprCompareCollSeq(Parse*,Expr*);
SQLITE_PRIVATE CollSeq *sqlite3BinaryCompareCollSeq(Parse *, Expr *, Expr *);
SQLITE_PRIVATE int sqlite3TempInMemory(const sqlite3*);
SQLITE_PRIVATE const char *sqlite3JournalModename(int);
#ifndef SQLITE_OMIT_WAL
SQLITE_PRIVATE   int sqlite3Checkpoint(sqlite3*, int, int, int*, int*);
SQLITE_PRIVATE   int sqlite3WalDefaultHook(void*,sqlite3*,const char*,int);
#endif
#ifndef SQLITE_OMIT_CTE
................................................................................
**
** EVIDENCE-OF: R-38799-08373 URI filenames can be enabled or disabled
** using the SQLITE_USE_URI=1 or SQLITE_USE_URI=0 compile-time options.
**
** EVIDENCE-OF: R-43642-56306 By default, URI handling is globally
** disabled. The default value may be changed by compiling with the
** SQLITE_USE_URI symbol defined.
**
** URI filenames are enabled by default if SQLITE_HAS_CODEC is
** enabled.
*/
#ifndef SQLITE_USE_URI
# ifdef SQLITE_HAS_CODEC
#  define SQLITE_USE_URI 1
# else
#  define SQLITE_USE_URI 0
# endif
#endif

/* EVIDENCE-OF: R-38720-18127 The default setting is determined by the
** SQLITE_ALLOW_COVERING_INDEX_SCAN compile-time option, or is "on" if
** that compile-time option is omitted.
*/
#if !defined(SQLITE_ALLOW_COVERING_INDEX_SCAN)
................................................................................
#endif

/*
** VDBE_DISPLAY_P4 is true or false depending on whether or not the
** "explain" P4 display logic is enabled.
*/
#if !defined(SQLITE_OMIT_EXPLAIN) || !defined(NDEBUG) \
     || defined(VDBE_PROFILE) || defined(SQLITE_DEBUG)

# define VDBE_DISPLAY_P4 1
#else
# define VDBE_DISPLAY_P4 0
#endif

/*
** SQL is translated into a sequence of instructions to be
................................................................................
  int rcApp;              /* errcode set by sqlite3_result_error_code() */
  u32 nWrite;             /* Number of write operations that have occurred */
#endif
  u16 nResColumn;         /* Number of columns in one row of the result set */
  u8 errorAction;         /* Recovery action to do in case of an error */
  u8 minWriteFileFormat;  /* Minimum file format for writable database files */
  u8 prepFlags;           /* SQLITE_PREPARE_* flags */

  bft expired:2;          /* 1: recompile VM immediately  2: when convenient */
  bft explain:2;          /* True if EXPLAIN present on SQL command */
  bft doingRerun:1;       /* True if rerunning after an auto-reprepare */
  bft changeCntOn:1;      /* True to update the change-counter */
  bft runOnlyOnce:1;      /* Automatically expire on reset */
  bft usesStmtJournal:1;  /* True if uses a statement journal */
  bft readOnly:1;         /* True for statements that do not write */
  bft bIsReader:1;        /* True for statements that read */
  yDbMask btreeMask;      /* Bitmask of db->aDb[] entries referenced */
  yDbMask lockMask;       /* Subset of btreeMask that requires a lock */
................................................................................
SQLITE_PRIVATE u32 sqlite3VdbeSerialGet(const unsigned char*, u32, Mem*);
SQLITE_PRIVATE void sqlite3VdbeDeleteAuxData(sqlite3*, AuxData**, int, int);

int sqlite2BtreeKeyCompare(BtCursor *, const void *, int, int, int *);
SQLITE_PRIVATE int sqlite3VdbeIdxKeyCompare(sqlite3*,VdbeCursor*,UnpackedRecord*,int*);
SQLITE_PRIVATE int sqlite3VdbeIdxRowid(sqlite3*, BtCursor*, i64*);
SQLITE_PRIVATE int sqlite3VdbeExec(Vdbe*);







#ifndef SQLITE_OMIT_EXPLAIN
SQLITE_PRIVATE int sqlite3VdbeList(Vdbe*);
#endif
SQLITE_PRIVATE int sqlite3VdbeHalt(Vdbe*);
SQLITE_PRIVATE int sqlite3VdbeChangeEncoding(Mem *, int);
SQLITE_PRIVATE int sqlite3VdbeMemTooBig(Mem*);
SQLITE_PRIVATE int sqlite3VdbeMemCopy(Mem*, const Mem*);
SQLITE_PRIVATE void sqlite3VdbeMemShallowCopy(Mem*, const Mem*, int);
................................................................................
SQLITE_PRIVATE double sqlite3VdbeRealValue(Mem*);
SQLITE_PRIVATE int sqlite3VdbeBooleanValue(Mem*, int ifNull);
SQLITE_PRIVATE void sqlite3VdbeIntegerAffinity(Mem*);
SQLITE_PRIVATE int sqlite3VdbeMemRealify(Mem*);
SQLITE_PRIVATE int sqlite3VdbeMemNumerify(Mem*);
SQLITE_PRIVATE int sqlite3VdbeMemCast(Mem*,u8,u8);
SQLITE_PRIVATE int sqlite3VdbeMemFromBtree(BtCursor*,u32,u32,Mem*);

SQLITE_PRIVATE void sqlite3VdbeMemRelease(Mem *p);
SQLITE_PRIVATE int sqlite3VdbeMemFinalize(Mem*, FuncDef*);
#ifndef SQLITE_OMIT_WINDOWFUNC
SQLITE_PRIVATE int sqlite3VdbeMemAggValue(Mem*, Mem*, FuncDef*);
#endif
#ifndef SQLITE_OMIT_EXPLAIN
SQLITE_PRIVATE const char *sqlite3OpcodeName(int);
#endif
SQLITE_PRIVATE int sqlite3VdbeMemGrow(Mem *pMem, int n, int preserve);
SQLITE_PRIVATE int sqlite3VdbeMemClearAndResize(Mem *pMem, int n);
SQLITE_PRIVATE int sqlite3VdbeCloseStatement(Vdbe *, int);
#ifdef SQLITE_DEBUG
SQLITE_PRIVATE int sqlite3VdbeFrameIsValid(VdbeFrame*);
................................................................................
static const struct {
  u8 eType;           /* Transformation type code */
  u8 nName;           /* Length of th name */
  char *zName;        /* Name of the transformation */
  double rLimit;      /* Maximum NNN value for this transform */
  double rXform;      /* Constant used for this transform */
} aXformType[] = {
  { 0, 6, "second", 464269060800.0, 86400000.0/(24.0*60.0*60.0) },
  { 0, 6, "minute", 7737817680.0,   86400000.0/(24.0*60.0)      },
  { 0, 4, "hour",   128963628.0,    86400000.0/24.0             },
  { 0, 3, "day",    5373485.0,      86400000.0                  },
  { 1, 5, "month",  176546.0,       30.0*86400000.0             },
  { 2, 4, "year",   14713.0,        365.0*86400000.0            },
};

/*
** Process a modifier to a date-time stamp.  The modifiers are
** as follows:
**
**     NNN days
................................................................................
  assert( sqlite3GlobalConfig.mutex.xMutexInit );
  rc = sqlite3GlobalConfig.mutex.xMutexInit();

#ifdef SQLITE_DEBUG
  GLOBAL(int, mutexIsInit) = 1;
#endif


  return rc;
}

/*
** Shutdown the mutex system. This call frees resources allocated by
** sqlite3MutexInit().
*/
................................................................................
    return priorLimit;
  }
  if( mem0.hardLimit>0 && (n>mem0.hardLimit || n==0) ){
    n = mem0.hardLimit;
  }
  mem0.alarmThreshold = n;
  nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
  mem0.nearlyFull = (n>0 && n<=nUsed);
  sqlite3_mutex_leave(mem0.mutex);
  excess = sqlite3_memory_used() - n;
  if( excess>0 ) sqlite3_release_memory((int)(excess & 0x7fffffff));
  return priorLimit;
}
SQLITE_API void sqlite3_soft_heap_limit(int n){
  if( n<0 ) n = 0;
................................................................................

/*
** Return true if the heap is currently under memory pressure - in other
** words if the amount of heap used is close to the limit set by
** sqlite3_soft_heap_limit().
*/
SQLITE_PRIVATE int sqlite3HeapNearlyFull(void){
  return mem0.nearlyFull;
}

/*
** Deinitialize the memory allocation subsystem.
*/
SQLITE_PRIVATE void sqlite3MallocEnd(void){
  if( sqlite3GlobalConfig.m.xShutdown ){
................................................................................
  ** following xRoundup() call. */
  nFull = sqlite3GlobalConfig.m.xRoundup(n);

  sqlite3StatusHighwater(SQLITE_STATUS_MALLOC_SIZE, n);
  if( mem0.alarmThreshold>0 ){
    sqlite3_int64 nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
    if( nUsed >= mem0.alarmThreshold - nFull ){
      mem0.nearlyFull = 1;
      sqlite3MallocAlarm(nFull);
      if( mem0.hardLimit ){
        nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
        if( nUsed >= mem0.hardLimit - nFull ){
          *pp = 0;
          return;
        }
      }
    }else{
      mem0.nearlyFull = 0;
    }
  }
  p = sqlite3GlobalConfig.m.xMalloc(nFull);
#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
  if( p==0 && mem0.alarmThreshold>0 ){
    sqlite3MallocAlarm(nFull);
    p = sqlite3GlobalConfig.m.xMalloc(nFull);
................................................................................
    sqlite3StatusHighwater(SQLITE_STATUS_MALLOC_SIZE, (int)nBytes);
    nDiff = nNew - nOld;
    if( nDiff>0 && sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED) >= 
          mem0.alarmThreshold-nDiff ){
      sqlite3MallocAlarm(nDiff);
    }
    pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);

    if( pNew==0 && mem0.alarmThreshold>0 ){
      sqlite3MallocAlarm((int)nBytes);
      pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);
    }

    if( pNew ){
      nNew = sqlite3MallocSize(pNew);
      sqlite3StatusUp(SQLITE_STATUS_MEMORY_USED, nNew-nOld);
    }
    sqlite3_mutex_leave(mem0.mutex);
  }else{
    pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);
................................................................................
        memcpy(pNew, p, lookasideMallocSize(db, p));
        sqlite3DbFree(db, p);
      }
    }else{
      assert( sqlite3MemdebugHasType(p, (MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
      assert( sqlite3MemdebugNoType(p, (u8)~(MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
      sqlite3MemdebugSetType(p, MEMTYPE_HEAP);
      pNew = sqlite3_realloc64(p, n);
      if( !pNew ){
        sqlite3OomFault(db);
      }
      sqlite3MemdebugSetType(pNew,
            (db->lookaside.bDisable==0 ? MEMTYPE_LOOKASIDE : MEMTYPE_HEAP));
    }
  }
................................................................................
** temporarily disable the lookaside memory allocator and interrupt
** any running VDBEs.
*/
SQLITE_PRIVATE void sqlite3OomFault(sqlite3 *db){
  if( db->mallocFailed==0 && db->bBenignMalloc==0 ){
    db->mallocFailed = 1;
    if( db->nVdbeExec>0 ){
      db->u1.isInterrupted = 1;
    }
    DisableLookaside;
    if( db->pParse ){
      db->pParse->rc = SQLITE_NOMEM_BKPT;
    }
  }
}
................................................................................
**
** The memory allocator is not restarted if there are running
** VDBEs.
*/
SQLITE_PRIVATE void sqlite3OomClear(sqlite3 *db){
  if( db->mallocFailed && db->nVdbeExec==0 ){
    db->mallocFailed = 0;
    db->u1.isInterrupted = 0;
    assert( db->lookaside.bDisable>0 );
    EnableLookaside;
  }
}

/*
** Take actions at the end of an API call to indicate an OOM error
................................................................................
      return 0;
    }else{
      p->nAlloc = (int)szNew;
    }
    if( p->db ){
      zNew = sqlite3DbRealloc(p->db, zOld, p->nAlloc);
    }else{
      zNew = sqlite3_realloc64(zOld, p->nAlloc);
    }
    if( zNew ){
      assert( p->zText!=0 || p->nChar==0 );
      if( !isMalloced(p) && p->nChar>0 ) memcpy(zNew, p->zText, p->nChar);
      p->zText = zNew;
      p->nAlloc = sqlite3DbMallocSize(p->db, zNew);
      p->printfFlags |= SQLITE_PRINTF_MALLOCED;
................................................................................
** A version of printf() that understands %lld.  Used for debugging.
** The printf() built into some versions of windows does not understand %lld
** and segfaults if you give it a long long int.
*/
SQLITE_PRIVATE void sqlite3DebugPrintf(const char *zFormat, ...){
  va_list ap;
  StrAccum acc;
  char zBuf[500];
  sqlite3StrAccumInit(&acc, 0, zBuf, sizeof(zBuf), 0);
  va_start(ap,zFormat);
  sqlite3_str_vappendf(&acc, zFormat, ap);
  va_end(ap);
  sqlite3StrAccumFinish(&acc);
#ifdef SQLITE_OS_TRACE_PROC
  {
................................................................................
    sqlite3_str_appendf(&x, "{%d:*}", pItem->iCursor);
    if( pItem->zDatabase ){
      sqlite3_str_appendf(&x, " %s.%s", pItem->zDatabase, pItem->zName);
    }else if( pItem->zName ){
      sqlite3_str_appendf(&x, " %s", pItem->zName);
    }
    if( pItem->pTab ){
      sqlite3_str_appendf(&x, " tab=%Q nCol=%d ptr=%p",
           pItem->pTab->zName, pItem->pTab->nCol, pItem->pTab);
    }
    if( pItem->zAlias ){
      sqlite3_str_appendf(&x, " (AS %s)", pItem->zAlias);
    }
    if( pItem->fg.jointype & JT_LEFT ){
      sqlite3_str_appendf(&x, " LEFT-JOIN");
    }
................................................................................

/*
** Generate a human-readable explanation of an expression tree.
*/
SQLITE_PRIVATE void sqlite3TreeViewExpr(TreeView *pView, const Expr *pExpr, u8 moreToFollow){
  const char *zBinOp = 0;   /* Binary operator */
  const char *zUniOp = 0;   /* Unary operator */
  char zFlgs[60];
  pView = sqlite3TreeViewPush(pView, moreToFollow);
  if( pExpr==0 ){
    sqlite3TreeViewLine(pView, "nil");
    sqlite3TreeViewPop(pView);
    return;
  }
  if( pExpr->flags || pExpr->affExpr ){
    StrAccum x;
    sqlite3StrAccumInit(&x, 0, zFlgs, sizeof(zFlgs), 0);
    sqlite3_str_appendf(&x, " fg.af=%x.%c",
      pExpr->flags, pExpr->affExpr ? pExpr->affExpr : 'n');
    if( ExprHasProperty(pExpr, EP_FromJoin) ){
      sqlite3_str_appendf(&x, " iRJT=%d", pExpr->iRightJoinTable);
    }
    if( ExprHasProperty(pExpr, EP_FromDDL) ){
      sqlite3_str_appendf(&x, " DDL");



    }
    sqlite3StrAccumFinish(&x);
  }else{
    zFlgs[0] = 0;
  }
  switch( pExpr->op ){
    case TK_AGG_COLUMN: {
................................................................................
    case TK_BITAND:  zBinOp = "BITAND"; break;
    case TK_BITOR:   zBinOp = "BITOR";  break;
    case TK_SLASH:   zBinOp = "DIV";    break;
    case TK_LSHIFT:  zBinOp = "LSHIFT"; break;
    case TK_RSHIFT:  zBinOp = "RSHIFT"; break;
    case TK_CONCAT:  zBinOp = "CONCAT"; break;
    case TK_DOT:     zBinOp = "DOT";    break;


    case TK_UMINUS:  zUniOp = "UMINUS"; break;
    case TK_UPLUS:   zUniOp = "UPLUS";  break;
    case TK_BITNOT:  zUniOp = "BITNOT"; break;
    case TK_NOT:     zUniOp = "NOT";    break;
    case TK_ISNULL:  zUniOp = "ISNULL"; break;
    case TK_NOTNULL: zUniOp = "NOTNULL"; break;
................................................................................
    *zOut++ = (u8)(0x00D8 + (((c-0x10000)>>18)&0x03));              \
    *zOut++ = (u8)(((c>>10)&0x003F) + (((c-0x10000)>>10)&0x00C0));  \
    *zOut++ = (u8)(0x00DC + ((c>>8)&0x03));                         \
    *zOut++ = (u8)(c&0x00FF);                                       \
  }                                                                 \
}

#define READ_UTF16LE(zIn, TERM, c){                                   \
  c = (*zIn++);                                                       \
  c += ((*zIn++)<<8);                                                 \
  if( c>=0xD800 && c<0xE000 && TERM ){                                \
    int c2 = (*zIn++);                                                \
    c2 += ((*zIn++)<<8);                                              \
    c = (c2&0x03FF) + ((c&0x003F)<<10) + (((c&0x03C0)+0x0040)<<10);   \
  }                                                                   \
}

#define READ_UTF16BE(zIn, TERM, c){                                   \
  c = ((*zIn++)<<8);                                                  \
  c += (*zIn++);                                                      \
  if( c>=0xD800 && c<0xE000 && TERM ){                                \
    int c2 = ((*zIn++)<<8);                                           \
    c2 += (*zIn++);                                                   \
    c = (c2&0x03FF) + ((c&0x003F)<<10) + (((c&0x03C0)+0x0040)<<10);   \
  }                                                                   \
}

/*
** Translate a single UTF-8 character.  Return the unicode value.
**
** During translation, assume that the byte that zTerm points
** is a 0x00.
**
** Write a pointer to the next unread byte back into *pzNext.
................................................................................
    pMem->n = (int)(z - zOut);
    *z++ = 0;
  }else{
    assert( desiredEnc==SQLITE_UTF8 );
    if( pMem->enc==SQLITE_UTF16LE ){
      /* UTF-16 Little-endian -> UTF-8 */
      while( zIn<zTerm ){
        READ_UTF16LE(zIn, zIn<zTerm, c); 















        WRITE_UTF8(z, c);
      }
    }else{
      /* UTF-16 Big-endian -> UTF-8 */
      while( zIn<zTerm ){
        READ_UTF16BE(zIn, zIn<zTerm, c); 















        WRITE_UTF8(z, c);
      }
    }
    pMem->n = (int)(z - zOut);
  }
  *z = 0;
  assert( (pMem->n+(desiredEnc==SQLITE_UTF8?1:2))<=len );
................................................................................
** in pZ.  nChar must be non-negative.
*/
SQLITE_PRIVATE int sqlite3Utf16ByteLen(const void *zIn, int nChar){
  int c;
  unsigned char const *z = zIn;
  int n = 0;
  
  if( SQLITE_UTF16NATIVE==SQLITE_UTF16BE ){
    while( n<nChar ){
      READ_UTF16BE(z, 1, c);
      n++;
    }
  }else{
    while( n<nChar ){
      READ_UTF16LE(z, 1, c);

      n++;
    }
  }
  return (int)(z-(unsigned char const *)zIn);

}

#if defined(SQLITE_TEST)
/*
** This routine is called from the TCL test function "translate_selftest".
** It checks that the primitives for serializing and deserializing
** characters in each encoding are inverses of each other.
................................................................................
    z[0] = 0;
    z = zBuf;
    c = sqlite3Utf8Read((const u8**)&z);
    t = i;
    if( i>=0xD800 && i<=0xDFFF ) t = 0xFFFD;
    if( (i&0xFFFFFFFE)==0xFFFE ) t = 0xFFFD;
    assert( c==t );
    assert( (z-zBuf)==n );
  }
  for(i=0; i<0x00110000; i++){
    if( i>=0xD800 && i<0xE000 ) continue;
    z = zBuf;
    WRITE_UTF16LE(z, i);
    n = (int)(z-zBuf);
    assert( n>0 && n<=4 );
    z[0] = 0;
    z = zBuf;
    READ_UTF16LE(z, 1, c);
    assert( c==i );
    assert( (z-zBuf)==n );
  }
  for(i=0; i<0x00110000; i++){
    if( i>=0xD800 && i<0xE000 ) continue;
    z = zBuf;
    WRITE_UTF16BE(z, i);
    n = (int)(z-zBuf);
    assert( n>0 && n<=4 );
    z[0] = 0;
    z = zBuf;
    READ_UTF16BE(z, 1, c);
    assert( c==i );
    assert( (z-zBuf)==n );
  }
}
#endif /* SQLITE_TEST */
#endif /* SQLITE_OMIT_UTF16 */

/************** End of utf.c *************************************************/
................................................................................
    return 1;
  }
  a = (unsigned char *)zLeft;
  b = (unsigned char *)zRight;
  while( N-- > 0 && *a!=0 && UpperToLower[*a]==UpperToLower[*b]){ a++; b++; }
  return N<0 ? 0 : UpperToLower[*a] - UpperToLower[*b];
}














/*
** Compute 10 to the E-th power.  Examples:  E==1 results in 10.
** E==2 results in 100.  E==50 results in 1.0e50.
**
** This routine only works for values of E between 1 and 341.
*/
................................................................................
#endif
#ifdef SQLITE_EBCDIC
  h += 9*(1&~(h>>4));
#endif
  return (u8)(h & 0xf);
}

#if !defined(SQLITE_OMIT_BLOB_LITERAL) || defined(SQLITE_HAS_CODEC)
/*
** Convert a BLOB literal of the form "x'hhhhhh'" into its binary
** value.  Return a pointer to its binary value.  Space to hold the
** binary value has been obtained from malloc and must be freed by
** the calling routine.
*/
SQLITE_PRIVATE void *sqlite3HexToBlob(sqlite3 *db, const char *z, int n){
................................................................................
    for(i=0; i<n; i+=2){
      zBlob[i/2] = (sqlite3HexToInt(z[i])<<4) | sqlite3HexToInt(z[i+1]);
    }
    zBlob[i/2] = 0;
  }
  return zBlob;
}
#endif /* !SQLITE_OMIT_BLOB_LITERAL || SQLITE_HAS_CODEC */

/*
** Log an error that is an API call on a connection pointer that should
** not have been used.  The "type" of connection pointer is given as the
** argument.  The zType is a word like "NULL" or "closed" or "invalid".
*/
static void logBadConnection(const char *zType){
................................................................................
    /*  56 */ "Lt"               OpHelp("IF r[P3]<r[P1]"),
    /*  57 */ "Ge"               OpHelp("IF r[P3]>=r[P1]"),
    /*  58 */ "ElseNotEq"        OpHelp(""),
    /*  59 */ "DecrJumpZero"     OpHelp("if (--r[P1])==0 goto P2"),
    /*  60 */ "IncrVacuum"       OpHelp(""),
    /*  61 */ "VNext"            OpHelp(""),
    /*  62 */ "Init"             OpHelp("Start at P2"),
    /*  63 */ "PureFunc"         OpHelp("r[P3]=func(r[P2@P5])"),
    /*  64 */ "Function"         OpHelp("r[P3]=func(r[P2@P5])"),
    /*  65 */ "Return"           OpHelp(""),
    /*  66 */ "EndCoroutine"     OpHelp(""),
    /*  67 */ "HaltIfNull"       OpHelp("if r[P3]=null halt"),
    /*  68 */ "Halt"             OpHelp(""),
    /*  69 */ "Integer"          OpHelp("r[P2]=P1"),
    /*  70 */ "Int64"            OpHelp("r[P2]=P4"),
    /*  71 */ "String"           OpHelp("r[P2]='P4' (len=P1)"),
................................................................................
    /* 123 */ "ResetCount"       OpHelp(""),
    /* 124 */ "SorterCompare"    OpHelp("if key(P1)!=trim(r[P3],P4) goto P2"),
    /* 125 */ "SorterData"       OpHelp("r[P2]=data"),
    /* 126 */ "RowData"          OpHelp("r[P2]=data"),
    /* 127 */ "Rowid"            OpHelp("r[P2]=rowid"),
    /* 128 */ "NullRow"          OpHelp(""),
    /* 129 */ "SeekEnd"          OpHelp(""),
    /* 130 */ "SorterInsert"     OpHelp("key=r[P2]"),
    /* 131 */ "IdxInsert"        OpHelp("key=r[P2]"),
    /* 132 */ "IdxDelete"        OpHelp("key=r[P2@P3]"),
    /* 133 */ "DeferredSeek"     OpHelp("Move P3 to P1.rowid if needed"),
    /* 134 */ "IdxRowid"         OpHelp("r[P2]=rowid"),
    /* 135 */ "FinishSeek"       OpHelp(""),
    /* 136 */ "Destroy"          OpHelp(""),
    /* 137 */ "Clear"            OpHelp(""),
    /* 138 */ "ResetSorter"      OpHelp(""),
................................................................................
      break;
    }
    if( fd>=SQLITE_MINIMUM_FILE_DESCRIPTOR ) break;
    osClose(fd);
    sqlite3_log(SQLITE_WARNING, 
                "attempt to open \"%s\" as file descriptor %d", z, fd);
    fd = -1;
    if( osOpen("/dev/null", f, m)<0 ) break;
  }
  if( fd>=0 ){
    if( m!=0 ){
      struct stat statbuf;
      if( osFstat(fd, &statbuf)==0 
       && statbuf.st_size==0
       && (statbuf.st_mode&0777)!=m 
................................................................................
# define osSetPosixAdvisoryLock(h,x,t) osFcntl(h,F_SETLK,x)
#else
static int osSetPosixAdvisoryLock(
  int h,                /* The file descriptor on which to take the lock */
  struct flock *pLock,  /* The description of the lock */
  unixFile *pFile       /* Structure holding timeout value */
){

  int rc = osFcntl(h,F_SETLK,pLock);
  while( rc<0 && pFile->iBusyTimeout>0 ){
    /* On systems that support some kind of blocking file lock with a timeout,
    ** make appropriate changes here to invoke that blocking file lock.  On
    ** generic posix, however, there is no such API.  So we simply try the
    ** lock once every millisecond until either the timeout expires, or until
    ** the lock is obtained. */
    usleep(1000);
    rc = osFcntl(h,F_SETLK,pLock);
    pFile->iBusyTimeout--;
  }
  return rc;
}
#endif /* SQLITE_ENABLE_SETLK_TIMEOUT */


/*
................................................................................
  for(ii=(int)strlen(zDirname); ii>0 && zDirname[ii]!='/'; ii--);
  if( ii>0 ){
    zDirname[ii] = '\0';
  }else{
    if( zDirname[0]!='/' ) zDirname[0] = '.';
    zDirname[1] = 0;
  }
  fd = robust_open(zDirname, O_RDONLY|O_BINARY|O_NOFOLLOW, 0);
  if( fd>=0 ){
    OSTRACE(("OPENDIR %-3d %s\n", fd, zDirname));
  }
  *pFd = fd;
  if( fd>=0 ) return SQLITE_OK;
  return unixLogError(SQLITE_CANTOPEN_BKPT, "openDirectory", zDirname);
}
................................................................................
    }
    case SQLITE_FCNTL_HAS_MOVED: {
      *(int*)pArg = fileHasMoved(pFile);
      return SQLITE_OK;
    }
#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
    case SQLITE_FCNTL_LOCK_TIMEOUT: {

      pFile->iBusyTimeout = *(int*)pArg;

      return SQLITE_OK;
    }
#endif
#if SQLITE_MAX_MMAP_SIZE>0
    case SQLITE_FCNTL_MMAP_SIZE: {
      i64 newLimit = *(i64*)pArg;
      int rc = SQLITE_OK;
................................................................................
  /* Shared locks never span more than one byte */
  assert( n==1 || lockType!=F_RDLCK );

  /* Locks are within range */
  assert( n>=1 && n<=SQLITE_SHM_NLOCK );

  if( pShmNode->hShm>=0 ){

    /* Initialize the locking parameters */
    f.l_type = lockType;
    f.l_whence = SEEK_SET;
    f.l_start = ofst;
    f.l_len = n;
    rc = osSetPosixAdvisoryLock(pShmNode->hShm, &f, pFile);




    rc = (rc!=(-1)) ? SQLITE_OK : SQLITE_BUSY;


  }

  /* Update the global lock state and do debug tracing */
#ifdef SQLITE_DEBUG
  { u16 mask;
  OSTRACE(("SHM-LOCK "));
  mask = ofst>31 ? 0xffff : (1<<(ofst+n)) - (1<<ofst);
................................................................................
  assert( flags==(SQLITE_SHM_LOCK | SQLITE_SHM_SHARED)
       || flags==(SQLITE_SHM_LOCK | SQLITE_SHM_EXCLUSIVE)
       || flags==(SQLITE_SHM_UNLOCK | SQLITE_SHM_SHARED)
       || flags==(SQLITE_SHM_UNLOCK | SQLITE_SHM_EXCLUSIVE) );
  assert( n==1 || (flags & SQLITE_SHM_EXCLUSIVE)!=0 );
  assert( pShmNode->hShm>=0 || pDbFd->pInode->bProcessLock==1 );
  assert( pShmNode->hShm<0 || pDbFd->pInode->bProcessLock==0 );




















  mask = (1<<(ofst+n)) - (1<<ofst);
  assert( n>1 || mask==(1<<ofst) );
  sqlite3_mutex_enter(pShmNode->pShmMutex);
  if( flags & SQLITE_SHM_UNLOCK ){
    u16 allMask = 0; /* Mask of locks held by siblings */

................................................................................
    pFile->ctrlFlags |= mask;
  }
}

/* Forward references to VFS helper methods used for temporary files */
static int winGetTempname(sqlite3_vfs *, char **);
static int winIsDir(const void *);

static BOOL winIsDriveLetterAndColon(const char *);

/*
** Control and query of the open file handle.
*/
static int winFileControl(sqlite3_file *id, int op, void *pArg){
  winFile *pFile = (winFile*)id;
................................................................................
      assert(!"Invalid flags argument");
  }
  *pResOut = rc;
  OSTRACE(("ACCESS name=%s, pResOut=%p, *pResOut=%d, rc=SQLITE_OK\n",
           zFilename, pResOut, *pResOut));
  return SQLITE_OK;
}












/*
** Returns non-zero if the specified path name starts with a drive letter
** followed by a colon character.
*/
static BOOL winIsDriveLetterAndColon(
  const char *zPathname
................................................................................
){
#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && !defined(__CYGWIN__)
  DWORD nByte;
  void *zConverted;
  char *zOut;
#endif

  /* If this path name begins with "/X:", where "X" is any alphabetic
  ** character, discard the initial "/" from the pathname.
  */
  if( zRelative[0]=='/' && winIsDriveLetterAndColon(zRelative+1) ){

    zRelative++;
  }

#if defined(__CYGWIN__)
  SimulateIOError( return SQLITE_ERROR );
  UNUSED_PARAMETER(nFull);
  assert( nFull>=pVfs->mxPathname );
................................................................................
    return SQLITE_FULL;
  }
  if( newSz>p->szMax ){
    return SQLITE_FULL;
  }
  newSz *= 2;
  if( newSz>p->szMax ) newSz = p->szMax;
  pNew = sqlite3_realloc64(p->aData, newSz);
  if( pNew==0 ) return SQLITE_NOMEM;
  p->aData = pNew;
  p->szAlloc = newSz;
  return SQLITE_OK;
}

/*
................................................................................
  sqlite3RowSetClear(pArg);
  sqlite3DbFree(((RowSet*)pArg)->db, pArg);
}

/*
** Allocate a new RowSetEntry object that is associated with the
** given RowSet.  Return a pointer to the new and completely uninitialized
** objected.
**
** In an OOM situation, the RowSet.db->mallocFailed flag is set and this
** routine returns NULL.
*/
static struct RowSetEntry *rowSetEntryAlloc(RowSet *p){
  assert( p!=0 );
  if( p->nFresh==0 ){  /*OPTIMIZATION-IF-FALSE*/
................................................................................
  ** To save unnecessary work, only do this when the batch number changes.
  */
  if( iBatch!=pRowSet->iBatch ){  /*OPTIMIZATION-IF-FALSE*/
    p = pRowSet->pEntry;
    if( p ){
      struct RowSetEntry **ppPrevTree = &pRowSet->pForest;
      if( (pRowSet->rsFlags & ROWSET_SORTED)==0 ){ /*OPTIMIZATION-IF-FALSE*/
        /* Only sort the current set of entiries if they need it */
        p = rowSetEntrySort(p);
      }
      for(pTree = pRowSet->pForest; pTree; pTree=pTree->pRight){
        ppPrevTree = &pTree->pRight;
        if( pTree->pLeft==0 ){
          pTree->pLeft = rowSetListToTree(p);
          break;
................................................................................
** stored in each frame (i.e. the db page-size when the WAL was created).
*/
SQLITE_PRIVATE int sqlite3WalFramesize(Wal *pWal);
#endif

/* Return the sqlite3_file object for the WAL file */
SQLITE_PRIVATE sqlite3_file *sqlite3WalFile(Wal *pWal);






#endif /* ifndef SQLITE_OMIT_WAL */
#endif /* SQLITE_WAL_H */

/************** End of wal.h *************************************************/
/************** Continuing where we left off in pager.c **********************/

................................................................................
** PagerSharedLock() for more detail.
**
** Pager.eLock may only be set to UNKNOWN_LOCK when the pager is in 
** PAGER_OPEN state.
*/
#define UNKNOWN_LOCK                (EXCLUSIVE_LOCK+1)

/*
** A macro used for invoking the codec if there is one
*/
#ifdef SQLITE_HAS_CODEC
# define CODEC1(P,D,N,X,E) \
    if( P->xCodec && P->xCodec(P->pCodec,D,N,X)==0 ){ E; }
# define CODEC2(P,D,N,X,E,O) \
    if( P->xCodec==0 ){ O=(char*)D; }else \
    if( (O=(char*)(P->xCodec(P->pCodec,D,N,X)))==0 ){ E; }
#else
# define CODEC1(P,D,N,X,E)   /* NO-OP */
# define CODEC2(P,D,N,X,E,O) O=(char*)D
#endif

/*
** The maximum allowed sector size. 64KiB. If the xSectorsize() method 
** returns a value larger than this, then MAX_SECTOR_SIZE is used instead.
** This could conceivably cause corruption following a power failure on
** such a system. This is currently an undocumented limit.
*/
#define MAX_SECTOR_SIZE 0x10000
................................................................................
  void *pBusyHandlerArg;      /* Context argument for xBusyHandler */
  int aStat[4];               /* Total cache hits, misses, writes, spills */
#ifdef SQLITE_TEST
  int nRead;                  /* Database pages read */
#endif
  void (*xReiniter)(DbPage*); /* Call this routine when reloading pages */
  int (*xGet)(Pager*,Pgno,DbPage**,int); /* Routine to fetch a patch */
#ifdef SQLITE_HAS_CODEC
  void *(*xCodec)(void*,void*,Pgno,int); /* Routine for en/decoding data */
  void (*xCodecSizeChng)(void*,int,int); /* Notify of page size changes */
  void (*xCodecFree)(void*);             /* Destructor for the codec */
  void *pCodec;               /* First argument to xCodec... methods */
#endif
  char *pTmpSpace;            /* Pager.pageSize bytes of space for tmp use */
  PCache *pPCache;            /* Pointer to page cache object */
#ifndef SQLITE_OMIT_WAL
  Wal *pWal;                  /* Write-ahead log used by "journal_mode=wal" */
  char *zWal;                 /* File name for write-ahead log */
#endif
};
................................................................................
**   * the database file is open,
**   * there are no dirty pages in the cache, and
**   * the desired page is not currently in the wal file.
*/
SQLITE_PRIVATE int sqlite3PagerDirectReadOk(Pager *pPager, Pgno pgno){
  if( pPager->fd->pMethods==0 ) return 0;
  if( sqlite3PCacheIsDirty(pPager->pPCache) ) return 0;
#ifdef SQLITE_HAS_CODEC
  if( pPager->xCodec!=0 ) return 0;
#endif
#ifndef SQLITE_OMIT_WAL
  if( pPager->pWal ){
    u32 iRead = 0;
    int rc;
    rc = sqlite3WalFindFrame(pPager->pWal, pgno, &iRead);
    return (rc==SQLITE_OK && iRead==0);
  }
................................................................................
** Set the Pager.xGet method for the appropriate routine used to fetch
** content from the pager.
*/
static void setGetterMethod(Pager *pPager){
  if( pPager->errCode ){
    pPager->xGet = getPageError;
#if SQLITE_MAX_MMAP_SIZE>0
  }else if( USEFETCH(pPager)
#ifdef SQLITE_HAS_CODEC
   && pPager->xCodec==0
#endif
  ){
    pPager->xGet = getPageMMap;
#endif /* SQLITE_MAX_MMAP_SIZE>0 */
  }else{
    pPager->xGet = getPageNormal;
  }
}

................................................................................
  while( i>0 ){
    cksum += aData[i];
    i -= 200;
  }
  return cksum;
}

/*
** Report the current page size and number of reserved bytes back
** to the codec.
*/
#ifdef SQLITE_HAS_CODEC
static void pagerReportSize(Pager *pPager){
  if( pPager->xCodecSizeChng ){
    pPager->xCodecSizeChng(pPager->pCodec, pPager->pageSize,
                           (int)pPager->nReserve);
  }
}
#else
# define pagerReportSize(X)     /* No-op if we do not support a codec */
#endif

#ifdef SQLITE_HAS_CODEC
/*
** Make sure the number of reserved bits is the same in the destination
** pager as it is in the source.  This comes up when a VACUUM changes the
** number of reserved bits to the "optimal" amount.
*/
SQLITE_PRIVATE void sqlite3PagerAlignReserve(Pager *pDest, Pager *pSrc){
  if( pDest->nReserve!=pSrc->nReserve ){
    pDest->nReserve = pSrc->nReserve;
    pagerReportSize(pDest);
  }
}
#endif

/*
** Read a single page from either the journal file (if isMainJrnl==1) or
** from the sub-journal (if isMainJrnl==0) and playback that page.
** The page begins at offset *pOffset into the file. The *pOffset
** value is increased to the start of the next page in the journal.
**
** The main rollback journal uses checksums - the statement journal does 
................................................................................
  int rc;
  PgHdr *pPg;                   /* An existing page in the cache */
  Pgno pgno;                    /* The page number of a page in journal */
  u32 cksum;                    /* Checksum used for sanity checking */
  char *aData;                  /* Temporary storage for the page */
  sqlite3_file *jfd;            /* The file descriptor for the journal file */
  int isSynced;                 /* True if journal page is synced */
#ifdef SQLITE_HAS_CODEC
  /* The jrnlEnc flag is true if Journal pages should be passed through
  ** the codec.  It is false for pure in-memory journals. */
  const int jrnlEnc = (isMainJrnl || pPager->subjInMemory==0);
#endif

  assert( (isMainJrnl&~1)==0 );      /* isMainJrnl is 0 or 1 */
  assert( (isSavepnt&~1)==0 );       /* isSavepnt is 0 or 1 */
  assert( isMainJrnl || pDone );     /* pDone always used on sub-journals */
  assert( isSavepnt || pDone==0 );   /* pDone never used on non-savepoint */

  aData = pPager->pTmpSpace;
................................................................................
    return rc;
  }

  /* When playing back page 1, restore the nReserve setting
  */
  if( pgno==1 && pPager->nReserve!=((u8*)aData)[20] ){
    pPager->nReserve = ((u8*)aData)[20];
    pagerReportSize(pPager);
  }

  /* If the pager is in CACHEMOD state, then there must be a copy of this
  ** page in the pager cache. In this case just update the pager cache,
  ** not the database file. The page is left marked dirty in this case.
  **
  ** An exception to the above rule: If the database is in no-sync mode
................................................................................

    /* Write the data read from the journal back into the database file.
    ** This is usually safe even for an encrypted database - as the data
    ** was encrypted before it was written to the journal file. The exception
    ** is if the data was just read from an in-memory sub-journal. In that
    ** case it must be encrypted here before it is copied into the database
    ** file.  */
#ifdef SQLITE_HAS_CODEC
    if( !jrnlEnc ){
      CODEC2(pPager, aData, pgno, 7, rc=SQLITE_NOMEM_BKPT, aData);
      rc = sqlite3OsWrite(pPager->fd, (u8 *)aData, pPager->pageSize, ofst);
      CODEC1(pPager, aData, pgno, 3, rc=SQLITE_NOMEM_BKPT);
    }else
#endif
    rc = sqlite3OsWrite(pPager->fd, (u8 *)aData, pPager->pageSize, ofst);

    if( pgno>pPager->dbFileSize ){
      pPager->dbFileSize = pgno;
    }
    if( pPager->pBackup ){
#ifdef SQLITE_HAS_CODEC
      if( jrnlEnc ){
        CODEC1(pPager, aData, pgno, 3, rc=SQLITE_NOMEM_BKPT);
        sqlite3BackupUpdate(pPager->pBackup, pgno, (u8*)aData);
        CODEC2(pPager, aData, pgno, 7, rc=SQLITE_NOMEM_BKPT,aData);
      }else
#endif
      sqlite3BackupUpdate(pPager->pBackup, pgno, (u8*)aData);
    }
  }else if( !isMainJrnl && pPg==0 ){
    /* If this is a rollback of a savepoint and data was not written to
    ** the database and the page is not in-memory, there is a potential
    ** problem. When the page is next fetched by the b-tree layer, it 
    ** will be read from the database file, which may or may not be 
................................................................................
    pager_set_pagehash(pPg);

    /* If this was page 1, then restore the value of Pager.dbFileVers.
    ** Do this before any decoding. */
    if( pgno==1 ){
      memcpy(&pPager->dbFileVers, &((u8*)pData)[24],sizeof(pPager->dbFileVers));
    }

    /* Decode the page just read from disk */
#if SQLITE_HAS_CODEC
    if( jrnlEnc ){ CODEC1(pPager, pData, pPg->pgno, 3, rc=SQLITE_NOMEM_BKPT); }
#endif
    sqlite3PcacheRelease(pPg);
  }
  return rc;
}

/*
** Parameter zMaster is the name of a master journal file. A single journal
................................................................................
    if( rc!=SQLITE_OK ){
      goto delmaster_out;
    }
    if( exists ){
      /* One of the journals pointed to by the master journal exists.
      ** Open it and check if it points at the master journal. If
      ** so, return without deleting the master journal file.



      */
      int c;
      int flags = (SQLITE_OPEN_READONLY|SQLITE_OPEN_MAIN_JOURNAL);
      rc = sqlite3OsOpen(pVfs, zJournal, pJournal, flags, 0);
      if( rc!=SQLITE_OK ){
        goto delmaster_out;
      }

      rc = readMasterJournal(pJournal, zMasterPtr, nMasterPtr);
      sqlite3OsClose(pJournal);
................................................................................
      */
      memset(pPager->dbFileVers, 0xff, sizeof(pPager->dbFileVers));
    }else{
      u8 *dbFileVers = &((u8*)pPg->pData)[24];
      memcpy(&pPager->dbFileVers, dbFileVers, sizeof(pPager->dbFileVers));
    }
  }
  CODEC1(pPager, pPg->pData, pPg->pgno, 3, rc = SQLITE_NOMEM_BKPT);

  PAGER_INCR(sqlite3_pager_readdb_count);
  PAGER_INCR(pPager->nRead);
  IOTRACE(("PGIN %p %d\n", pPager, pPg->pgno));
  PAGERTRACE(("FETCH %d page %d hash(%08x)\n",
               PAGERID(pPager), pPg->pgno, pager_pagehash(pPg)));

  return rc;
................................................................................
  }

  *pPageSize = pPager->pageSize;
  if( rc==SQLITE_OK ){
    if( nReserve<0 ) nReserve = pPager->nReserve;
    assert( nReserve>=0 && nReserve<1000 );
    pPager->nReserve = (i16)nReserve;
    pagerReportSize(pPager);
    pagerFixMaplimit(pPager);
  }
  return rc;
}

/*
** Return a pointer to the "temporary page" buffer held internally
................................................................................
  enable_simulated_io_errors();
  PAGERTRACE(("CLOSE %d\n", PAGERID(pPager)));
  IOTRACE(("CLOSE %p\n", pPager))
  sqlite3OsClose(pPager->jfd);
  sqlite3OsClose(pPager->fd);
  sqlite3PageFree(pTmp);
  sqlite3PcacheClose(pPager->pPCache);

#ifdef SQLITE_HAS_CODEC
  if( pPager->xCodecFree ) pPager->xCodecFree(pPager->pCodec);
#endif

  assert( !pPager->aSavepoint && !pPager->pInJournal );
  assert( !isOpen(pPager->jfd) && !isOpen(pPager->sjfd) );

  sqlite3_free(pPager);
  return SQLITE_OK;
}

................................................................................
    if( pgno<=pPager->dbSize && 0==(pList->flags&PGHDR_DONT_WRITE) ){
      i64 offset = (pgno-1)*(i64)pPager->pageSize;   /* Offset to write */
      char *pData;                                   /* Data to write */    

      assert( (pList->flags&PGHDR_NEED_SYNC)==0 );
      if( pList->pgno==1 ) pager_write_changecounter(pList);

      /* Encode the database */
      CODEC2(pPager, pList->pData, pgno, 6, return SQLITE_NOMEM_BKPT, pData);

      /* Write out the page data. */
      rc = sqlite3OsWrite(pPager->fd, pData, pPager->pageSize, offset);

      /* If page 1 was just written, update Pager.dbFileVers to match
      ** the value now stored in the database file. If writing this 
      ** page caused the database file to grow, update dbFileSize. 
................................................................................

    /* If the sub-journal was opened successfully (or was already open),
    ** write the journal record into the file.  */
    if( rc==SQLITE_OK ){
      void *pData = pPg->pData;
      i64 offset = (i64)pPager->nSubRec*(4+pPager->pageSize);
      char *pData2;

#if SQLITE_HAS_CODEC   
      if( !pPager->subjInMemory ){
        CODEC2(pPager, pData, pPg->pgno, 7, return SQLITE_NOMEM_BKPT, pData2);
      }else
#endif
      pData2 = pData;
      PAGERTRACE(("STMT-JOURNAL %d page %d\n", PAGERID(pPager), pPg->pgno));
      rc = write32bits(pPager->sjfd, offset, pPg->pgno);
      if( rc==SQLITE_OK ){
        rc = sqlite3OsWrite(pPager->sjfd, pData2, pPager->pageSize, offset+4);
      }
    }
................................................................................
  ** file name. The layout in memory is as follows:
  **
  **     Pager object                    (sizeof(Pager) bytes)
  **     PCache object                   (sqlite3PcacheSize() bytes)
  **     Database file handle            (pVfs->szOsFile bytes)
  **     Sub-journal file handle         (journalFileSize bytes)
  **     Main journal file handle        (journalFileSize bytes)
  **     \0\1\0 journal prefix           (3 bytes)
  **     Journal filename                (nPathname+8+1 bytes)
  **     \2\0 WAL prefix                 (2 bytes)
  **     WAL filename                    (nPathname+4+1 bytes)
  **     \3\0 database prefix            (2 bytes)
  **     Database file name              (nPathname+1 bytes)
  **     URI query parameters            (nUriByte bytes)


  **     \0\0 terminator                 (2 bytes)



























  */
  pPtr = (u8 *)sqlite3MallocZero(
    ROUND8(sizeof(*pPager)) +            /* Pager structure */
    ROUND8(pcacheSize) +                 /* PCache object */
    ROUND8(pVfs->szOsFile) +             /* The main db file */
    journalFileSize * 2 +                /* The two journal files */

    3 +                                  /* Journal prefix */


    nPathname + 8 + 1 +                  /* Journal filename */
#ifndef SQLITE_OMIT_WAL
    2 +                                  /* WAL prefix */
    nPathname + 4 + 1 +                  /* WAL filename */
#endif
    2 +                                  /* Database prefix */
    nPathname + 1 +                      /* database filename */
    nUriByte +                           /* query parameters */
    2                                    /* Terminator */
  );
  assert( EIGHT_BYTE_ALIGNMENT(SQLITE_INT_TO_PTR(journalFileSize)) );
  if( !pPtr ){
    sqlite3DbFree(0, zPathname);
    return SQLITE_NOMEM_BKPT;
  }
  pPager = (Pager*)pPtr;                  pPtr += ROUND8(sizeof(*pPager));
  pPager->pPCache = (PCache*)pPtr;        pPtr += ROUND8(pcacheSize);
  pPager->fd = (sqlite3_file*)pPtr;       pPtr += ROUND8(pVfs->szOsFile);
  pPager->sjfd = (sqlite3_file*)pPtr;     pPtr += journalFileSize;
  pPager->jfd =  (sqlite3_file*)pPtr;     pPtr += journalFileSize;
  assert( EIGHT_BYTE_ALIGNMENT(pPager->jfd) );















  /* Fill in Pager.zJournal */
  pPtr[1] = '\001';                       pPtr += 3;
  if( nPathname>0 ){
    pPager->zJournal = (char*)pPtr;
    memcpy(pPtr, zPathname, nPathname);   pPtr += nPathname;
    memcpy(pPtr, "-journal",8);           pPtr += 8 + 1;
#ifdef SQLITE_ENABLE_8_3_NAMES
    sqlite3FileSuffix3(zFilename,pPager->zJournal);
    pPtr = (u8*)(pPager->zJournal + sqlite3Strlen30(pPager->zJournal)+1);
#endif
  }else{
    pPager->zJournal = 0;
    pPtr++;
  }

#ifndef SQLITE_OMIT_WAL
  /* Fill in Pager.zWal */
  pPtr[0] = '\002'; pPtr[1] = 0;          pPtr += 2;
  if( nPathname>0 ){
    pPager->zWal = (char*)pPtr;
    memcpy(pPtr, zPathname, nPathname);   pPtr += nPathname;
    memcpy(pPtr, "-wal", 4);              pPtr += 4 + 1;
#ifdef SQLITE_ENABLE_8_3_NAMES
    sqlite3FileSuffix3(zFilename, pPager->zWal);
    pPtr = (u8*)(pPager->zWal + sqlite3Strlen30(pPager->zWal)+1);
#endif
  }else{
    pPager->zWal = 0;
    pPtr++;
  }
#endif

  /* Fill in the Pager.zFilename and pPager.zQueryParam fields */
  pPtr[0] = '\003'; pPtr[1] = 0;          pPtr += 2;
  pPager->zFilename = (char*)pPtr;
  memcpy(pPtr, zPathname, nPathname);     pPtr += nPathname + 1;
  if( zUri ){
    memcpy(pPtr, zUri, nUriByte);      /* pPtr += nUriByte; // not needed */
  }
  /* Double-zero terminator implied by the sqlite3MallocZero */

  if( nPathname ) sqlite3DbFree(0, zPathname);
  pPager->pVfs = pVfs;
  pPager->vfsFlags = vfsFlags;

  /* Open the pager file.
  */
  if( zFilename && zFilename[0] ){
................................................................................
  /* memset(pPager->aHash, 0, sizeof(pPager->aHash)); */
  /* pPager->szMmap = SQLITE_DEFAULT_MMAP_SIZE // will be set by btree.c */

  *ppPager = pPager;
  return SQLITE_OK;
}
















/*
** This function is called after transitioning from PAGER_UNLOCK to
** PAGER_SHARED state. It tests if there is a hot journal present in
** the file-system for the given pager. A hot journal is one that 
** needs to be played back. According to this function, a hot-journal
................................................................................
  ** flag was specified by the caller. And so long as the db is not a 
  ** temporary or in-memory database.  */
  const int bMmapOk = (pgno>1
   && (pPager->eState==PAGER_READER || (flags & PAGER_GET_READONLY))
  );

  assert( USEFETCH(pPager) );
#ifdef SQLITE_HAS_CODEC
  assert( pPager->xCodec==0 );
#endif

  /* Optimization note:  Adding the "pgno<=1" term before "pgno==0" here
  ** allows the compiler optimizer to reuse the results of the "pgno>1"
  ** test in the previous statement, and avoid testing pgno==0 in the
  ** common case where pgno is large. */
  if( pgno<=1 && pgno==0 ){
    return SQLITE_CORRUPT_BKPT;
................................................................................
}
SQLITE_PRIVATE void sqlite3PagerUnrefPageOne(DbPage *pPg){
  Pager *pPager;
  assert( pPg!=0 );
  assert( pPg->pgno==1 );
  assert( (pPg->flags & PGHDR_MMAP)==0 ); /* Page1 is never memory mapped */
  pPager = pPg->pPager;
  sqlite3PagerResetLockTimeout(pPager);
  sqlite3PcacheRelease(pPg);
  pagerUnlockIfUnused(pPager);
}

/*
** This function is called at the start of every write transaction.
** There must already be a RESERVED or EXCLUSIVE lock on the database 
................................................................................

  /* We should never write to the journal file the page that
  ** contains the database locks.  The following assert verifies
  ** that we do not. */
  assert( pPg->pgno!=PAGER_MJ_PGNO(pPager) );

  assert( pPager->journalHdr<=pPager->journalOff );
  CODEC2(pPager, pPg->pData, pPg->pgno, 7, return SQLITE_NOMEM_BKPT, pData2);
  cksum = pager_cksum(pPager, (u8*)pData2);

  /* Even if an IO or diskfull error occurs while journalling the
  ** page in the block above, set the need-sync flag for the page.
  ** Otherwise, when the transaction is rolled back, the logic in
  ** playback_one_page() will think that the page needs to be restored
  ** in the database file. And if an IO error occurs while doing so,
................................................................................
      /* Actually do the update of the change counter */
      pager_write_changecounter(pPgHdr);

      /* If running in direct mode, write the contents of page 1 to the file. */
      if( DIRECT_MODE ){
        const void *zBuf;
        assert( pPager->dbFileSize>0 );
        CODEC2(pPager, pPgHdr->pData, 1, 6, rc=SQLITE_NOMEM_BKPT, zBuf);
        if( rc==SQLITE_OK ){
          rc = sqlite3OsWrite(pPager->fd, zBuf, pPager->pageSize, 0);
          pPager->aStat[PAGER_STAT_WRITE]++;
        }
        if( rc==SQLITE_OK ){
          /* Update the pager's copy of the change-counter. Otherwise, the
          ** next time a read transaction is opened the cache will be
................................................................................
** shared cache, it uses nullIfMemDb==0 so that in-memory databases can
** participate in shared-cache.
**
** The return value to this routine is always safe to use with
** sqlite3_uri_parameter() and sqlite3_filename_database() and friends.
*/
SQLITE_PRIVATE const char *sqlite3PagerFilename(const Pager *pPager, int nullIfMemDb){
  static const char zFake[] = { 0x00, 0x01, 0x00, 0x00, 0x00 };
  return (nullIfMemDb && pPager->memDb) ? &zFake[3] : pPager->zFilename;
}

/*
** Return the VFS structure for the pager.
*/
SQLITE_PRIVATE sqlite3_vfs *sqlite3PagerVfs(Pager *pPager){
  return pPager->pVfs;
................................................................................
** with the pager.  This might return NULL if the file has
** not yet been opened.
*/
SQLITE_PRIVATE sqlite3_file *sqlite3PagerFile(Pager *pPager){
  return pPager->fd;
}

#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
/*
** Reset the lock timeout for pager.
*/
SQLITE_PRIVATE void sqlite3PagerResetLockTimeout(Pager *pPager){
  int x = 0;
  sqlite3OsFileControl(pPager->fd, SQLITE_FCNTL_LOCK_TIMEOUT, &x);
}
#endif

/*
** Return the file handle for the journal file (if it exists).
** This will be either the rollback journal or the WAL file.
*/
SQLITE_PRIVATE sqlite3_file *sqlite3PagerJrnlFile(Pager *pPager){
#if SQLITE_OMIT_WAL
  return pPager->jfd;
................................................................................
/*
** Return the full pathname of the journal file.
*/
SQLITE_PRIVATE const char *sqlite3PagerJournalname(Pager *pPager){
  return pPager->zJournal;
}

#ifdef SQLITE_HAS_CODEC
/*
** Set or retrieve the codec for this pager
*/
SQLITE_PRIVATE void sqlite3PagerSetCodec(
  Pager *pPager,
  void *(*xCodec)(void*,void*,Pgno,int),
  void (*xCodecSizeChng)(void*,int,int),
  void (*xCodecFree)(void*),
  void *pCodec
){
  if( pPager->xCodecFree ){
    pPager->xCodecFree(pPager->pCodec);
  }else{
    pager_reset(pPager);
  }
  pPager->xCodec = pPager->memDb ? 0 : xCodec;
  pPager->xCodecSizeChng = xCodecSizeChng;
  pPager->xCodecFree = xCodecFree;
  pPager->pCodec = pCodec;
  setGetterMethod(pPager);
  pagerReportSize(pPager);
}
SQLITE_PRIVATE void *sqlite3PagerGetCodec(Pager *pPager){
  return pPager->pCodec;
}

/*
** This function is called by the wal module when writing page content
** into the log file.
**
** This function returns a pointer to a buffer containing the encrypted
** page content. If a malloc fails, this function may return NULL.
*/
SQLITE_PRIVATE void *sqlite3PagerCodec(PgHdr *pPg){
  void *aData = 0;
  CODEC2(pPg->pPager, pPg->pData, pPg->pgno, 6, return 0, aData);
  return aData;
}

/*
** Return the current pager state
*/
SQLITE_PRIVATE int sqlite3PagerState(Pager *pPager){
  return pPager->eState;
}
#endif /* SQLITE_HAS_CODEC */

#ifndef SQLITE_OMIT_AUTOVACUUM
/*
** Move the page pPg to location pgno in the file.
**
** There must be no references to the page previously located at
** pgno (which we call pPgOld) though that page is allowed to be
** in cache.  If the page previously located at pgno is not already
................................................................................
  if( pPager->pWal ){
    rc = sqlite3WalCheckpoint(pPager->pWal, db, eMode,
        (eMode==SQLITE_CHECKPOINT_PASSIVE ? 0 : pPager->xBusyHandler),
        pPager->pBusyHandlerArg,
        pPager->walSyncFlags, pPager->pageSize, (u8 *)pPager->pTmpSpace,
        pnLog, pnCkpt
    );
    sqlite3PagerResetLockTimeout(pPager);
  }
  return rc;
}

SQLITE_PRIVATE int sqlite3PagerWalCallback(Pager *pPager){
  return sqlite3WalCallback(pPager->pWal);
}
................................................................................
      pagerFixMaplimit(pPager);
      if( rc && !pPager->exclusiveMode ) pagerUnlockDb(pPager, SHARED_LOCK);
    }
  }
  return rc;
}



























#ifdef SQLITE_ENABLE_SNAPSHOT
/*
** If this is a WAL database, obtain a snapshot handle for the snapshot
** currently open. Otherwise, return an error.
*/
SQLITE_PRIVATE int sqlite3PagerSnapshotGet(Pager *pPager, sqlite3_snapshot **ppSnapshot){
................................................................................
}

/*
** If this is a WAL database, store a pointer to pSnapshot. Next time a
** read transaction is opened, attempt to read from the snapshot it 
** identifies. If this is not a WAL database, return an error.
*/
SQLITE_PRIVATE int sqlite3PagerSnapshotOpen(Pager *pPager, sqlite3_snapshot *pSnapshot){



  int rc = SQLITE_OK;
  if( pPager->pWal ){
    sqlite3WalSnapshotOpen(pPager->pWal, pSnapshot);
  }else{
    rc = SQLITE_ERROR;
  }
  return rc;
................................................................................
#if defined(SQLITE_TEST) && defined(SQLITE_DEBUG)
SQLITE_PRIVATE int sqlite3WalTrace = 0;
# define WALTRACE(X)  if(sqlite3WalTrace) sqlite3DebugPrintf X
#else
# define WALTRACE(X)
#endif

/*
** WAL mode depends on atomic aligned 32-bit loads and stores in a few
** places.  The following macros try to make this explicit.
*/
#if GCC_VESRION>=5004000
# define AtomicLoad(PTR)       __atomic_load_n((PTR),__ATOMIC_RELAXED)
# define AtomicStore(PTR,VAL)  __atomic_store_n((PTR),(VAL),__ATOMIC_RELAXED)
#else
# define AtomicLoad(PTR)       (*(PTR))
# define AtomicStore(PTR,VAL)  (*(PTR) = (VAL))
#endif

/*
** The maximum (and only) versions of the wal and wal-index formats
** that may be interpreted by this version of SQLite.
**
** If a client begins recovering a WAL file and finds that (a) the checksum
** values in the wal-header are correct and (b) the version field is not
** WAL_MAX_VERSION, recovery fails and SQLite returns SQLITE_CANTOPEN.
................................................................................
  u32 nCkpt;                 /* Checkpoint sequence counter in the wal-header */
#ifdef SQLITE_DEBUG
  u8 lockError;              /* True if a locking error has occurred */
#endif
#ifdef SQLITE_ENABLE_SNAPSHOT
  WalIndexHdr *pSnapshot;    /* Start transaction here if not NULL */
#endif



};

/*
** Candidate values for Wal.exclusiveMode.
*/
#define WAL_NORMAL_MODE     0
#define WAL_EXCLUSIVE_MODE  1     
................................................................................
){
  int rc = SQLITE_OK;

  /* Enlarge the pWal->apWiData[] array if required */
  if( pWal->nWiData<=iPage ){
    sqlite3_int64 nByte = sizeof(u32*)*(iPage+1);
    volatile u32 **apNew;
    apNew = (volatile u32 **)sqlite3_realloc64((void *)pWal->apWiData, nByte);
    if( !apNew ){
      *ppPage = 0;
      return SQLITE_NOMEM_BKPT;
    }
    memset((void*)&apNew[pWal->nWiData], 0,
           sizeof(u32*)*(iPage+1-pWal->nWiData));
    pWal->apWiData = apNew;
................................................................................
static int walLockShared(Wal *pWal, int lockIdx){
  int rc;
  if( pWal->exclusiveMode ) return SQLITE_OK;
  rc = sqlite3OsShmLock(pWal->pDbFd, lockIdx, 1,
                        SQLITE_SHM_LOCK | SQLITE_SHM_SHARED);
  WALTRACE(("WAL%p: acquire SHARED-%s %s\n", pWal,
            walLockName(lockIdx), rc ? "failed" : "ok"));
  VVA_ONLY( pWal->lockError = (u8)(rc!=SQLITE_OK && rc!=SQLITE_BUSY); )
  return rc;
}
static void walUnlockShared(Wal *pWal, int lockIdx){
  if( pWal->exclusiveMode ) return;
  (void)sqlite3OsShmLock(pWal->pDbFd, lockIdx, 1,
                         SQLITE_SHM_UNLOCK | SQLITE_SHM_SHARED);
  WALTRACE(("WAL%p: release SHARED-%s\n", pWal, walLockName(lockIdx)));
................................................................................
static int walLockExclusive(Wal *pWal, int lockIdx, int n){
  int rc;
  if( pWal->exclusiveMode ) return SQLITE_OK;
  rc = sqlite3OsShmLock(pWal->pDbFd, lockIdx, n,
                        SQLITE_SHM_LOCK | SQLITE_SHM_EXCLUSIVE);
  WALTRACE(("WAL%p: acquire EXCLUSIVE-%s cnt=%d %s\n", pWal,
            walLockName(lockIdx), n, rc ? "failed" : "ok"));
  VVA_ONLY( pWal->lockError = (u8)(rc!=SQLITE_OK && rc!=SQLITE_BUSY); )
  return rc;
}
static void walUnlockExclusive(Wal *pWal, int lockIdx, int n){
  if( pWal->exclusiveMode ) return;
  (void)sqlite3OsShmLock(pWal->pDbFd, lockIdx, n,
                         SQLITE_SHM_UNLOCK | SQLITE_SHM_EXCLUSIVE);
  WALTRACE(("WAL%p: release EXCLUSIVE-%s cnt=%d\n", pWal,
................................................................................
  if( rc!=SQLITE_OK ){
    walIteratorFree(p);
    p = 0;
  }
  *pp = p;
  return rc;
}




















































































/*
** Attempt to obtain the exclusive WAL lock defined by parameters lockIdx and
** n. If the attempt fails and parameter xBusy is not NULL, then it is a
** busy-handler function. Invoke it and retry the lock until either the
** lock is successfully obtained or the busy-handler returns 0.
*/
................................................................................
  int lockIdx,                    /* Offset of first byte to lock */
  int n                           /* Number of bytes to lock */
){
  int rc;
  do {
    rc = walLockExclusive(pWal, lockIdx, n);
  }while( xBusy && rc==SQLITE_BUSY && xBusy(pBusyArg) );






  return rc;
}

/*
** The cache of the wal-index header must be valid to call this function.
** Return the page-size in bytes used by the database.
*/
................................................................................
  int i;                          /* Loop counter */
  u32 *aSalt = pWal->hdr.aSalt;   /* Big-endian salt values */
  pWal->nCkpt++;
  pWal->hdr.mxFrame = 0;
  sqlite3Put4byte((u8*)&aSalt[0], 1 + sqlite3Get4byte((u8*)&aSalt[0]));
  memcpy(&pWal->hdr.aSalt[1], &salt1, 4);
  walIndexWriteHdr(pWal);
  pInfo->nBackfill = 0;
  pInfo->nBackfillAttempted = 0;
  pInfo->aReadMark[1] = 0;
  for(i=2; i<WAL_NREADER; i++) pInfo->aReadMark[i] = READMARK_NOT_USED;
  assert( pInfo->aReadMark[0]==0 );
}

/*
................................................................................

      /* If the database may grow as a result of this checkpoint, hint
      ** about the eventual size of the db file to the VFS layer.
      */
      if( rc==SQLITE_OK ){
        i64 nReq = ((i64)mxPage * szPage);
        i64 nSize;                    /* Current size of database file */

        rc = sqlite3OsFileSize(pWal->pDbFd, &nSize);
        if( rc==SQLITE_OK && nSize<nReq ){
          sqlite3OsFileControlHint(pWal->pDbFd, SQLITE_FCNTL_SIZE_HINT, &nReq);
        }
      }


      /* Iterate through the contents of the WAL, copying data to the db file */
      while( rc==SQLITE_OK && 0==walIteratorNext(pIter, &iDbpage, &iFrame) ){
        i64 iOffset;
        assert( walFramePgno(pWal, iFrame)==iDbpage );
        if( db->u1.isInterrupted ){
          rc = db->mallocFailed ? SQLITE_NOMEM_BKPT : SQLITE_INTERRUPT;
          break;
        }
        if( iFrame<=nBackfill || iFrame>mxSafeFrame || iDbpage>mxPage ){
          continue;
        }
        iOffset = walFrameOffset(iFrame, szPage) + WAL_FRAME_HDRSIZE;
................................................................................
        rc = sqlite3OsRead(pWal->pWalFd, zBuf, szPage, iOffset);
        if( rc!=SQLITE_OK ) break;
        iOffset = (iDbpage-1)*(i64)szPage;
        testcase( IS_BIG_INT(iOffset) );
        rc = sqlite3OsWrite(pWal->pDbFd, zBuf, szPage, iOffset);
        if( rc!=SQLITE_OK ) break;
      }


      /* If work was actually accomplished... */
      if( rc==SQLITE_OK ){
        if( mxSafeFrame==walIndexHdr(pWal)->mxFrame ){
          i64 szDb = pWal->hdr.nPage*(i64)szPage;
          testcase( IS_BIG_INT(szDb) );
          rc = sqlite3OsTruncate(pWal->pDbFd, szDb);
          if( rc==SQLITE_OK ){
            rc = sqlite3OsSync(pWal->pDbFd, CKPT_SYNC_FLAGS(sync_flags));
          }
        }
        if( rc==SQLITE_OK ){
          rc = sqlite3OsFileControl(pWal->pDbFd, SQLITE_FCNTL_CKPT_DONE, 0);
          if( rc==SQLITE_NOTFOUND ) rc = SQLITE_OK;
        }
        if( rc==SQLITE_OK ){
          pInfo->nBackfill = mxSafeFrame;
        }
      }

      /* Release the reader lock held while backfilling */
      walUnlockExclusive(pWal, WAL_READ_LOCK(0), 1);
    }

................................................................................
  ** being modified by another thread or process.
  */
  badHdr = (page0 ? walIndexTryHdr(pWal, pChanged) : 1);

  /* If the first attempt failed, it might have been due to a race
  ** with a writer.  So get a WRITE lock and try again.
  */
  assert( badHdr==0 || pWal->writeLock==0 );
  if( badHdr ){
    if( pWal->bShmUnreliable==0 && (pWal->readOnly & WAL_SHM_RDONLY) ){
      if( SQLITE_OK==(rc = walLockShared(pWal, WAL_WRITE_LOCK)) ){
        walUnlockShared(pWal, WAL_WRITE_LOCK);
        rc = SQLITE_READONLY_RECOVERY;
      }


    }else if( SQLITE_OK==(rc = walLockExclusive(pWal, WAL_WRITE_LOCK, 1)) ){
      pWal->writeLock = 1;
      if( SQLITE_OK==(rc = walIndexPage(pWal, 0, &page0)) ){
        badHdr = walIndexTryHdr(pWal, pChanged);
        if( badHdr ){
          /* If the wal-index header is still malformed even while holding
          ** a WRITE lock, it can only mean that the header is corrupted and
          ** needs to be reconstructed.  So run recovery to do exactly that.
          */
          rc = walIndexRecover(pWal);
          *pChanged = 1;
        }
      }

      pWal->writeLock = 0;
      walUnlockExclusive(pWal, WAL_WRITE_LOCK, 1);


    }
  }

  /* If the header is read successfully, check the version number to make
  ** sure the wal-index was not constructed with some future format that
  ** this version of SQLite cannot understand.
  */
................................................................................
      return walBeginShmUnreliable(pWal, pChanged);
    }
  }

  assert( pWal->nWiData>0 );
  assert( pWal->apWiData[0]!=0 );
  pInfo = walCkptInfo(pWal);
  if( !useWal && pInfo->nBackfill==pWal->hdr.mxFrame
#ifdef SQLITE_ENABLE_SNAPSHOT
   && (pWal->pSnapshot==0 || pWal->hdr.mxFrame==0)
#endif
  ){
    /* The WAL has been completely backfilled (or it is empty).
    ** and can be safely ignored.
    */
................................................................................
  }
  if( (pWal->readOnly & WAL_SHM_RDONLY)==0
   && (mxReadMark<mxFrame || mxI==0)
  ){
    for(i=1; i<WAL_NREADER; i++){
      rc = walLockExclusive(pWal, WAL_READ_LOCK(i), 1);
      if( rc==SQLITE_OK ){
        mxReadMark = AtomicStore(pInfo->aReadMark+i,mxFrame);

        mxI = i;
        walUnlockExclusive(pWal, WAL_READ_LOCK(i), 1);
        break;
      }else if( rc!=SQLITE_BUSY ){
        return rc;
      }
    }
................................................................................
    if( rc==SQLITE_OK ){
      void *pBuf1 = sqlite3_malloc(szPage);
      void *pBuf2 = sqlite3_malloc(szPage);
      if( pBuf1==0 || pBuf2==0 ){
        rc = SQLITE_NOMEM;
      }else{
        u32 i = pInfo->nBackfillAttempted;
        for(i=pInfo->nBackfillAttempted; i>pInfo->nBackfill; i--){
          WalHashLoc sLoc;          /* Hash table location */
          u32 pgno;                 /* Page number in db file */
          i64 iDbOff;               /* Offset of db file entry */
          i64 iWalOff;              /* Offset of wal file entry */

          rc = walHashGet(pWal, walFramePage(i), &sLoc);
          if( rc!=SQLITE_OK ) break;
................................................................................
** Pager layer will use this to know that its cache is stale and
** needs to be flushed.
*/
SQLITE_PRIVATE int sqlite3WalBeginReadTransaction(Wal *pWal, int *pChanged){
  int rc;                         /* Return code */
  int cnt = 0;                    /* Number of TryBeginRead attempts */



#ifdef SQLITE_ENABLE_SNAPSHOT
  int bChanged = 0;
  WalIndexHdr *pSnapshot = pWal->pSnapshot;

  if( pSnapshot && memcmp(pSnapshot, &pWal->hdr, sizeof(WalIndexHdr))!=0 ){
    bChanged = 1;


















  }
#endif

  do{
    rc = walTryBeginRead(pWal, pChanged, 0, ++cnt);
  }while( rc==WAL_RETRY );
  testcase( (rc&0xff)==SQLITE_BUSY );
................................................................................
      **         checkpoint need not have completed for this to cause problems.
      */
      volatile WalCkptInfo *pInfo = walCkptInfo(pWal);

      assert( pWal->readLock>0 || pWal->hdr.mxFrame==0 );
      assert( pInfo->aReadMark[pWal->readLock]<=pSnapshot->mxFrame );

      /* It is possible that there is a checkpointer thread running 
      ** concurrent with this code. If this is the case, it may be that the
      ** checkpointer has already determined that it will checkpoint 
      ** snapshot X, where X is later in the wal file than pSnapshot, but 
      ** has not yet set the pInfo->nBackfillAttempted variable to indicate 
      ** its intent. To avoid the race condition this leads to, ensure that
      ** there is no checkpointer process by taking a shared CKPT lock 
      ** before checking pInfo->nBackfillAttempted.  
      **
      ** TODO: Does the aReadMark[] lock prevent a checkpointer from doing
      **       this already?
      */
      rc = walLockShared(pWal, WAL_CKPT_LOCK);

      if( rc==SQLITE_OK ){
        /* Check that the wal file has not been wrapped. Assuming that it has
        ** not, also check that no checkpointer has attempted to checkpoint any
        ** frames beyond pSnapshot->mxFrame. If either of these conditions are
        ** true, return SQLITE_ERROR_SNAPSHOT. Otherwise, overwrite pWal->hdr
        ** with *pSnapshot and set *pChanged as appropriate for opening the
        ** snapshot.  */
        if( !memcmp(pSnapshot->aSalt, pWal->hdr.aSalt, sizeof(pWal->hdr.aSalt))
         && pSnapshot->mxFrame>=pInfo->nBackfillAttempted
        ){
          assert( pWal->readLock>0 );
          memcpy(&pWal->hdr, pSnapshot, sizeof(WalIndexHdr));
          *pChanged = bChanged;
        }else{
          rc = SQLITE_ERROR_SNAPSHOT;
        }

        /* Release the shared CKPT lock obtained above. */
        walUnlockShared(pWal, WAL_CKPT_LOCK);






        pWal->minFrame = 1;
      }


      if( rc!=SQLITE_OK ){
        sqlite3WalEndReadTransaction(pWal);
      }
    }
  }







#endif
  return rc;
}

/*
** Finish with a read transaction.  All this does is release the
** read-lock.
................................................................................
** thread to write as doing so would cause a fork.  So this routine
** returns SQLITE_BUSY in that case and no write transaction is started.
**
** There can only be a single writer active at a time.
*/
SQLITE_PRIVATE int sqlite3WalBeginWriteTransaction(Wal *pWal){
  int rc;











  /* Cannot start a write transaction without first holding a read
  ** transaction. */
  assert( pWal->readLock>=0 );
  assert( pWal->writeLock==0 && pWal->iReCksum==0 );

  if( pWal->readOnly ){
................................................................................
  PgHdr *pPage,               /* The page of the frame to be written */
  int nTruncate,              /* The commit flag.  Usually 0.  >0 for commit */
  sqlite3_int64 iOffset       /* Byte offset at which to write */
){
  int rc;                         /* Result code from subfunctions */
  void *pData;                    /* Data actually written */
  u8 aFrame[WAL_FRAME_HDRSIZE];   /* Buffer to assemble frame-header in */
#if defined(SQLITE_HAS_CODEC)
  if( (pData = sqlite3PagerCodec(pPage))==0 ) return SQLITE_NOMEM_BKPT;
#else
  pData = pPage->pData;
#endif
  walEncodeFrame(p->pWal, pPage->pgno, nTruncate, pData, aFrame);
  rc = walWriteToLog(p, aFrame, sizeof(aFrame), iOffset);
  if( rc ) return rc;
  /* Write the page data */
  rc = walWriteToLog(p, pData, p->szPage, iOffset+sizeof(aFrame));
  return rc;
}
................................................................................
      assert( rc==SQLITE_OK || iWrite==0 );
      if( iWrite>=iFirst ){
        i64 iOff = walFrameOffset(iWrite, szPage) + WAL_FRAME_HDRSIZE;
        void *pData;
        if( pWal->iReCksum==0 || iWrite<pWal->iReCksum ){
          pWal->iReCksum = iWrite;
        }
#if defined(SQLITE_HAS_CODEC)
        if( (pData = sqlite3PagerCodec(p))==0 ) return SQLITE_NOMEM;
#else
        pData = p->pData;
#endif
        rc = sqlite3OsWrite(pWal->pWalFd, pData, szPage, iOff);
        if( rc ) return rc;
        p->flags &= ~PGHDR_WAL_APPEND;
        continue;
      }
    }

................................................................................

  /* EVIDENCE-OF: R-62920-47450 The busy-handler callback is never invoked
  ** in the SQLITE_CHECKPOINT_PASSIVE mode. */
  assert( eMode!=SQLITE_CHECKPOINT_PASSIVE || xBusy==0 );

  if( pWal->readOnly ) return SQLITE_READONLY;
  WALTRACE(("WAL%p: checkpoint begins\n", pWal));






  /* IMPLEMENTATION-OF: R-62028-47212 All calls obtain an exclusive 
  ** "checkpoint" lock on the database file. */
  rc = walLockExclusive(pWal, WAL_CKPT_LOCK, 1);
  if( rc ){
    /* EVIDENCE-OF: R-10421-19736 If any other process is running a
    ** checkpoint operation at the same time, the lock cannot be obtained and
    ** SQLITE_BUSY is returned.
    ** EVIDENCE-OF: R-53820-33897 Even if there is a busy-handler configured,
    ** it will not be invoked in this case.
    */

    testcase( rc==SQLITE_BUSY );
    testcase( xBusy!=0 );
    return rc;
  }


  pWal->ckptLock = 1;

  /* IMPLEMENTATION-OF: R-59782-36818 The SQLITE_CHECKPOINT_FULL, RESTART and
  ** TRUNCATE modes also obtain the exclusive "writer" lock on the database
  ** file.
  **
  ** EVIDENCE-OF: R-60642-04082 If the writer lock cannot be obtained
  ** immediately, and a busy-handler is configured, it is invoked and the
  ** writer lock retried until either the busy-handler returns 0 or the
  ** lock is successfully obtained.
  */
  if( eMode!=SQLITE_CHECKPOINT_PASSIVE ){
    rc = walBusyLock(pWal, xBusy, pBusyArg, WAL_WRITE_LOCK, 1);
    if( rc==SQLITE_OK ){
      pWal->writeLock = 1;
    }else if( rc==SQLITE_BUSY ){
      eMode2 = SQLITE_CHECKPOINT_PASSIVE;
      xBusy2 = 0;
      rc = SQLITE_OK;
    }
  }



  /* Read the wal-index header. */
  if( rc==SQLITE_OK ){

    rc = walIndexReadHdr(pWal, &isChanged);

    if( isChanged && pWal->pDbFd->pMethods->iVersion>=3 ){
      sqlite3OsUnfetch(pWal->pDbFd, 0, 0);
    }
  }

  /* Copy data from the log to the database file. */
  if( rc==SQLITE_OK ){
................................................................................
    ** performed, then the pager-cache associated with pWal is now
    ** out of date. So zero the cached wal-index header to ensure that
    ** next time the pager opens a snapshot on this database it knows that
    ** the cache needs to be reset.
    */
    memset(&pWal->hdr, 0, sizeof(WalIndexHdr));
  }




  /* Release the locks. */
  sqlite3WalEndWriteTransaction(pWal);

  walUnlockExclusive(pWal, WAL_CKPT_LOCK, 1);
  pWal->ckptLock = 0;

  WALTRACE(("WAL%p: checkpoint %s\n", pWal, rc ? "failed" : "ok"));



  return (rc==SQLITE_OK && eMode!=eMode2 ? SQLITE_BUSY : rc);
}

/* Return the value to pass to a sqlite3_wal_hook callback, the
** number of frames in the WAL at the point of the last commit since
** sqlite3WalCallback() was called.  If no commits have occurred since
** the last call, then return 0.
................................................................................
  }

  return rc;
}

/* Try to open on pSnapshot when the next read-transaction starts
*/
SQLITE_PRIVATE void sqlite3WalSnapshotOpen(Wal *pWal, sqlite3_snapshot *pSnapshot){



  pWal->pSnapshot = (WalIndexHdr*)pSnapshot;
}

/* 
** Return a +ve value if snapshot p1 is newer than p2. A -ve value if
** p1 is older than p2 and zero if p1 and p2 are the same snapshot.
*/
................................................................................
#ifndef SQLITE_OMIT_AUTOVACUUM
  u8 autoVacuum;        /* True if auto-vacuum is enabled */
  u8 incrVacuum;        /* True if incr-vacuum is enabled */
  u8 bDoTruncate;       /* True to truncate db on commit */
#endif
  u8 inTransaction;     /* Transaction state */
  u8 max1bytePayload;   /* Maximum first byte of cell for a 1-byte payload */
#ifdef SQLITE_HAS_CODEC
  u8 optimalReserve;    /* Desired amount of reserved space per page */
#endif
  u16 btsFlags;         /* Boolean parameters.  See BTS_* macros below */
  u16 maxLocal;         /* Maximum local payload in non-LEAFDATA tables */
  u16 minLocal;         /* Minimum local payload in non-LEAFDATA tables */
  u16 maxLeaf;          /* Maximum local payload in a LEAFDATA table */
  u16 minLeaf;          /* Minimum local payload in a LEAFDATA table */
  u32 pageSize;         /* Total number of bytes on a page */
  u32 usableSize;       /* Number of usable bytes on each page */
................................................................................
**
** This function is called when a free-list leaf page is removed from the
** free-list for reuse. It returns false if it is safe to retrieve the
** page from the pager layer with the 'no-content' flag set. True otherwise.
*/
static int btreeGetHasContent(BtShared *pBt, Pgno pgno){
  Bitvec *p = pBt->pHasContent;
  return (p && (pgno>sqlite3BitvecSize(p) || sqlite3BitvecTest(p, pgno)));
}

/*
** Clear (destroy) the BtShared.pHasContent bitvec. This should be
** invoked at the conclusion of each write-transaction.
*/
static void btreeClearHasContent(BtShared *pBt){
................................................................................
      if( iFree2>usableSize-4 ) return SQLITE_CORRUPT_PAGE(pPage);
      if( 0==iFree2 || (data[iFree2]==0 && data[iFree2+1]==0) ){
        u8 *pEnd = &data[cellOffset + nCell*2];
        u8 *pAddr;
        int sz2 = 0;
        int sz = get2byte(&data[iFree+2]);
        int top = get2byte(&data[hdr+5]);
        if( NEVER(top>=iFree) ){
          return SQLITE_CORRUPT_PAGE(pPage);
        }
        if( iFree2 ){
          if( iFree+sz>iFree2 ) return SQLITE_CORRUPT_PAGE(pPage);
          sz2 = get2byte(&data[iFree2+2]);
          if( iFree2+sz2 > usableSize ) return SQLITE_CORRUPT_PAGE(pPage);
          memmove(&data[iFree+sz+sz2], &data[iFree+sz], iFree2-(iFree+sz));
................................................................................
  }
  x = get2byte(&data[hdr+5]);
  if( iStart<=x ){
    /* The new freeblock is at the beginning of the cell content area,
    ** so just extend the cell content area rather than create another
    ** freelist entry */
    if( iStart<x ) return SQLITE_CORRUPT_PAGE(pPage);
    if( NEVER(iPtr!=hdr+1) ) return SQLITE_CORRUPT_PAGE(pPage);
    put2byte(&data[hdr+1], iFreeBlk);
    put2byte(&data[hdr+5], iEnd);
  }else{
    /* Insert the new freeblock into the freelist */
    put2byte(&data[iPtr], iStart);
  }
  if( pPage->pBt->btsFlags & BTS_FAST_SECURE ){
................................................................................
/*
** Invoke the busy handler for a btree.
*/
static int btreeInvokeBusyHandler(void *pArg){
  BtShared *pBt = (BtShared*)pArg;
  assert( pBt->db );
  assert( sqlite3_mutex_held(pBt->db->mutex) );
  return sqlite3InvokeBusyHandler(&pBt->db->busyHandler,
                                  sqlite3PagerFile(pBt->pPager));
}

/*
** Open a database file.
** 
** zFilename is the name of the database file.  If zFilename is NULL
** then an ephemeral database is created.  The ephemeral database might
................................................................................
** bytes per page is left unchanged.
**
** If the iFix!=0 then the BTS_PAGESIZE_FIXED flag is set so that the page size
** and autovacuum mode can no longer be changed.
*/
SQLITE_PRIVATE int sqlite3BtreeSetPageSize(Btree *p, int pageSize, int nReserve, int iFix){
  int rc = SQLITE_OK;

  BtShared *pBt = p->pBt;
  assert( nReserve>=-1 && nReserve<=255 );
  sqlite3BtreeEnter(p);
#if SQLITE_HAS_CODEC
  if( nReserve>pBt->optimalReserve ) pBt->optimalReserve = (u8)nReserve;
#endif

  if( pBt->btsFlags & BTS_PAGESIZE_FIXED ){
    sqlite3BtreeLeave(p);
    return SQLITE_READONLY;
  }
  if( nReserve<0 ){
    nReserve = pBt->pageSize - pBt->usableSize;
  }
  assert( nReserve>=0 && nReserve<=255 );
  if( pageSize>=512 && pageSize<=SQLITE_MAX_PAGE_SIZE &&
        ((pageSize-1)&pageSize)==0 ){
    assert( (pageSize & 7)==0 );
    assert( !pBt->pCursor );
    pBt->pageSize = (u32)pageSize;
    freeTempSpace(pBt);
................................................................................
}

/*
** Return the number of bytes of space at the end of every page that
** are intentually left unused.  This is the "reserved" space that is
** sometimes used by extensions.
**
** If SQLITE_HAS_MUTEX is defined then the number returned is the
** greater of the current reserved space and the maximum requested
** reserve space.
*/
SQLITE_PRIVATE int sqlite3BtreeGetOptimalReserve(Btree *p){
  int n;
  sqlite3BtreeEnter(p);

  n = sqlite3BtreeGetReserveNoMutex(p);
#ifdef SQLITE_HAS_CODEC
  if( n<p->pBt->optimalReserve ) n = p->pBt->optimalReserve;
#endif
  sqlite3BtreeLeave(p);
  return n;
}


/*
** Set the maximum page count for a database if mxPage is positive.
** No changes are made if mxPage is 0 or negative.
** Regardless of the value of mxPage, return the maximum page count.
................................................................................
** One or the other of the two processes must give way or there can be
** no progress.  By returning SQLITE_BUSY and not invoking the busy callback
** when A already has a read lock, we encourage A to give up and let B
** proceed.
*/
SQLITE_PRIVATE int sqlite3BtreeBeginTrans(Btree *p, int wrflag, int *pSchemaVersion){
  BtShared *pBt = p->pBt;

  int rc = SQLITE_OK;

  sqlite3BtreeEnter(p);
  btreeIntegrity(p);

  /* If the btree is already in a write-transaction, or it
  ** is already in a read-transaction and a read-transaction
................................................................................
  */
  if( p->inTrans==TRANS_WRITE || (p->inTrans==TRANS_READ && !wrflag) ){
    goto trans_begun;
  }
  assert( pBt->inTransaction==TRANS_WRITE || IfNotOmitAV(pBt->bDoTruncate)==0 );

  if( (p->db->flags & SQLITE_ResetDatabase) 
   && sqlite3PagerIsreadonly(pBt->pPager)==0 
  ){
    pBt->btsFlags &= ~BTS_READ_ONLY;
  }

  /* Write transactions are not possible on a read-only database */
  if( (pBt->btsFlags & BTS_READ_ONLY)!=0 && wrflag ){
    rc = SQLITE_READONLY;
................................................................................
  ** on page 1, the transaction cannot be opened. */
  rc = querySharedCacheTableLock(p, MASTER_ROOT, READ_LOCK);
  if( SQLITE_OK!=rc ) goto trans_begun;

  pBt->btsFlags &= ~BTS_INITIALLY_EMPTY;
  if( pBt->nPage==0 ) pBt->btsFlags |= BTS_INITIALLY_EMPTY;
  do {












    /* Call lockBtree() until either pBt->pPage1 is populated or
    ** lockBtree() returns something other than SQLITE_OK. lockBtree()
    ** may return SQLITE_OK but leave pBt->pPage1 set to 0 if after
    ** reading page 1 it discovers that the page-size of the database 
    ** file is not pBt->pageSize. In this case lockBtree() will update
    ** pBt->pageSize to the page-size of the file on disk.
    */
    while( pBt->pPage1==0 && SQLITE_OK==(rc = lockBtree(pBt)) );

    if( rc==SQLITE_OK && wrflag ){
      if( (pBt->btsFlags & BTS_READ_ONLY)!=0 ){
        rc = SQLITE_READONLY;
      }else{
        rc = sqlite3PagerBegin(pBt->pPager,wrflag>1,sqlite3TempInMemory(p->db));
        if( rc==SQLITE_OK ){
          rc = newDatabase(pBt);
        }else if( rc==SQLITE_BUSY_SNAPSHOT && pBt->inTransaction==TRANS_NONE ){
          /* if there was no transaction opened when this function was
          ** called and SQLITE_BUSY_SNAPSHOT is returned, change the error
          ** code to SQLITE_BUSY. */
          rc = SQLITE_BUSY;
        }
      }
    }
  
    if( rc!=SQLITE_OK ){

      unlockBtreeIfUnused(pBt);
    }
  }while( (rc&0xFF)==SQLITE_BUSY && pBt->inTransaction==TRANS_NONE &&
          btreeInvokeBusyHandler(pBt) );
  sqlite3PagerResetLockTimeout(pBt->pPager);




  if( rc==SQLITE_OK ){
    if( p->inTrans==TRANS_NONE ){
      pBt->nTransaction++;
#ifndef SQLITE_OMIT_SHARED_CACHE
      if( p->sharable ){
        assert( p->lock.pBtree==p && p->lock.iTable==1 );
................................................................................
      *pSchemaVersion = get4byte(&pBt->pPage1->aData[40]);
    }
    if( wrflag ){
      /* This call makes sure that the pager has the correct number of
      ** open savepoints. If the second parameter is greater than 0 and
      ** the sub-journal is not already open, then it will be opened here.
      */
      rc = sqlite3PagerOpenSavepoint(pBt->pPager, p->db->nSavepoint);
    }
  }

  btreeIntegrity(p);
  sqlite3BtreeLeave(p);
  return rc;
}
................................................................................
  memcpy(pTmp, aData, pPg->pBt->usableSize);
#endif

  /* Remove cells from the start and end of the page */
  assert( nCell>=0 );
  if( iOld<iNew ){
    int nShift = pageFreeArray(pPg, iOld, iNew-iOld, pCArray);
    if( nShift>nCell ) return SQLITE_CORRUPT_BKPT;
    memmove(pPg->aCellIdx, &pPg->aCellIdx[nShift*2], nCell*2);
    nCell -= nShift;
  }
  if( iNewEnd < iOldEnd ){
    int nTail = pageFreeArray(pPg, iNewEnd, iOldEnd - iNewEnd, pCArray);
    assert( nCell>=nTail );
    nCell -= nTail;
................................................................................
    }
#endif
  }
  sqlite3BtreeLeave(p);
  return rc;
}

#ifndef SQLITE_OMIT_BTREECOUNT
/*
** The first argument, pCur, is a cursor opened on some b-tree. Count the
** number of entries in the b-tree and write the result to *pnEntry.
**
** SQLITE_OK is returned if the operation is successfully executed. 
** Otherwise, if an error is encountered (i.e. an IO error or database
** corruption) an SQLite error code is returned.
................................................................................
    *pnEntry = 0;
    return SQLITE_OK;
  }

  /* Unless an error occurs, the following loop runs one iteration for each
  ** page in the B-Tree structure (not including overflow pages). 
  */
  while( rc==SQLITE_OK && !db->u1.isInterrupted ){
    int iIdx;                          /* Index of child node in parent */
    MemPage *pPage;                    /* Current page of the b-tree */

    /* If this is a leaf page or the tree is not an int-key tree, then 
    ** this page contains countable entries. Increment the entry counter
    ** accordingly.
    */
................................................................................
      rc = moveToChild(pCur, get4byte(findCell(pPage, iIdx)));
    }
  }

  /* An error has occurred. Return an error code. */
  return rc;
}
#endif

/*
** Return the pager associated with a BTree.  This routine is used for
** testing and debugging only.
*/
SQLITE_PRIVATE Pager *sqlite3BtreePager(Btree *p){
  return p->pBt->pPager;
................................................................................
    checkAppendMsg(pCheck, "invalid page number %d", iPage);
    return 1;
  }
  if( getPageReferenced(pCheck, iPage) ){
    checkAppendMsg(pCheck, "2nd reference to page %d", iPage);
    return 1;
  }
  if( pCheck->db->u1.isInterrupted ) return 1;
  setPageReferenced(pCheck, iPage);
  return 0;
}

#ifndef SQLITE_OMIT_AUTOVACUUM
/*
** Check that the entry in the pointer-map for page iChild maps to 
................................................................................

/*
** Attempt to set the page size of the destination to match the page size
** of the source.
*/
static int setDestPgsz(sqlite3_backup *p){
  int rc;
  rc = sqlite3BtreeSetPageSize(p->pDest,sqlite3BtreeGetPageSize(p->pSrc),-1,0);
  return rc;
}

/*
** Check that there is no open read-transaction on the b-tree passed as the
** second argument. If there is not, return SQLITE_OK. Otherwise, if there
** is an open read-transaction, return SQLITE_ERROR and leave an error 
................................................................................
  int bUpdate                     /* True for an update, false otherwise */
){
  Pager * const pDestPager = sqlite3BtreePager(p->pDest);
  const int nSrcPgsz = sqlite3BtreeGetPageSize(p->pSrc);
  int nDestPgsz = sqlite3BtreeGetPageSize(p->pDest);
  const int nCopy = MIN(nSrcPgsz, nDestPgsz);
  const i64 iEnd = (i64)iSrcPg*(i64)nSrcPgsz;
#ifdef SQLITE_HAS_CODEC
  /* Use BtreeGetReserveNoMutex() for the source b-tree, as although it is
  ** guaranteed that the shared-mutex is held by this thread, handle
  ** p->pSrc may not actually be the owner.  */
  int nSrcReserve = sqlite3BtreeGetReserveNoMutex(p->pSrc);
  int nDestReserve = sqlite3BtreeGetOptimalReserve(p->pDest);
#endif
  int rc = SQLITE_OK;
  i64 iOff;

  assert( sqlite3BtreeGetReserveNoMutex(p->pSrc)>=0 );
  assert( p->bDestLocked );
  assert( !isFatalError(p->rc) );
  assert( iSrcPg!=PENDING_BYTE_PAGE(p->pSrc->pBt) );
................................................................................
  /* Catch the case where the destination is an in-memory database and the
  ** page sizes of the source and destination differ. 
  */
  if( nSrcPgsz!=nDestPgsz && sqlite3PagerIsMemdb(pDestPager) ){
    rc = SQLITE_READONLY;
  }

#ifdef SQLITE_HAS_CODEC
  /* Backup is not possible if the page size of the destination is changing
  ** and a codec is in use.
  */
  if( nSrcPgsz!=nDestPgsz && sqlite3PagerGetCodec(pDestPager)!=0 ){
    rc = SQLITE_READONLY;
  }

  /* Backup is not possible if the number of bytes of reserve space differ
  ** between source and destination.  If there is a difference, try to
  ** fix the destination to agree with the source.  If that is not possible,
  ** then the backup cannot proceed.
  */
  if( nSrcReserve!=nDestReserve ){
    u32 newPgsz = nSrcPgsz;
    rc = sqlite3PagerSetPagesize(pDestPager, &newPgsz, nSrcReserve);
    if( rc==SQLITE_OK && newPgsz!=(u32)nSrcPgsz ) rc = SQLITE_READONLY;
  }
#endif

  /* This loop runs once for each destination page spanned by the source 
  ** page. For each iteration, variable iOff is set to the byte offset
  ** of the destination page.
  */
  for(iOff=iEnd-(i64)nSrcPgsz; rc==SQLITE_OK && iOff<iEnd; iOff+=nDestPgsz){
    DbPage *pDestPg = 0;
    Pgno iDest = (Pgno)(iOff/nDestPgsz)+1;
................................................................................
  */
  memset(&b, 0, sizeof(b));
  b.pSrcDb = pFrom->db;
  b.pSrc = pFrom;
  b.pDest = pTo;
  b.iNext = 1;

#ifdef SQLITE_HAS_CODEC
  sqlite3PagerAlignReserve(sqlite3BtreePager(pTo), sqlite3BtreePager(pFrom));
#endif

  /* 0x7FFFFFFF is the hard limit for the number of pages in a database
  ** file. By passing this as the number of pages to copy to
  ** sqlite3_backup_step(), we can guarantee that the copy finishes 
  ** within a single call (unless an error occurs). The assert() statement
  ** checks this assumption - (p->rc) should be set to either SQLITE_DONE 
  ** or an error code.  */
  sqlite3_backup_step(&b, 0x7FFFFFFF);
................................................................................
  for(i=1, pX=pVdbe->aMem+1; i<pVdbe->nMem; i++, pX++){
    if( pX->pScopyFrom==pMem ){
      u16 mFlags;
      if( pVdbe->db->flags & SQLITE_VdbeTrace ){
        sqlite3DebugPrintf("Invalidate R[%d] due to change in R[%d]\n",
          (int)(pX - pVdbe->aMem), (int)(pMem - pVdbe->aMem));
      }
      /* If pX is marked as a shallow copy of pMem, then verify that
      ** no significant changes have been made to pX since the OP_SCopy.
      ** A significant change would indicated a missed call to this
      ** function for pX.  Minor changes, such as adding or removing a
      ** dual type, are allowed, as long as the underlying value is the
      ** same. */
      mFlags = pMem->flags & pX->flags & pX->mScopyFlags;
      assert( (mFlags&(MEM_Int|MEM_IntReal))==0 || pMem->u.i==pX->u.i );
      /* assert( (mFlags&MEM_Real)==0 || pMem->u.r==pX->u.r ); */
      /*                                          ^^           */
      /*       Cannot reliably compare doubles for equality    */
      assert( (mFlags&MEM_Str)==0  || (pMem->n==pX->n && pMem->z==pX->z) );
      assert( (mFlags&MEM_Blob)==0  || sqlite3BlobCompare(pMem,pX)==0 );
      
      /* pMem is the register that is changing.  But also mark pX as
      ** undefined so that we can quickly detect the shallow-copy error */
      pX->flags = MEM_Undefined;
      pX->pScopyFrom = 0;
    }
  }
................................................................................
** pMem->zMalloc space will be allocated if necessary.  The calling routine
** is responsible for making sure that the pMem object is eventually
** destroyed.
**
** If this routine fails for any reason (malloc returns NULL or unable
** to read from the disk) then the pMem is left in an inconsistent state.
*/
static SQLITE_NOINLINE int vdbeMemFromBtreeResize(
  BtCursor *pCur,   /* Cursor pointing at record to retrieve. */
  u32 offset,       /* Offset from the start of data to return bytes from. */
  u32 amt,          /* Number of bytes to return. */
  Mem *pMem         /* OUT: Return data in this Mem structure. */
){
  int rc;
  pMem->flags = MEM_Null;
................................................................................
      pMem->n = (int)amt;
    }else{
      sqlite3VdbeMemRelease(pMem);
    }
  }
  return rc;
}
SQLITE_PRIVATE int sqlite3VdbeMemFromBtree(
  BtCursor *pCur,   /* Cursor pointing at record to retrieve. */
  u32 offset,       /* Offset from the start of data to return bytes from. */
  u32 amt,          /* Number of bytes to return. */
  Mem *pMem         /* OUT: Return data in this Mem structure. */
){
  char *zData;        /* Data from the btree layer */
  u32 available = 0;  /* Number of bytes available on the local btree page */
  int rc = SQLITE_OK; /* Return code */

  assert( sqlite3BtreeCursorIsValid(pCur) );
  assert( !VdbeMemDynamic(pMem) );

  /* Note: the calls to BtreeKeyFetch() and DataFetch() below assert() 
  ** that both the BtShared and database handle mutexes are held. */
  assert( !sqlite3VdbeMemIsRowSet(pMem) );
  zData = (char *)sqlite3BtreePayloadFetch(pCur, &available);
  assert( zData!=0 );

  if( offset+amt<=available ){
    pMem->z = &zData[offset];
    pMem->flags = MEM_Blob|MEM_Ephem;
    pMem->n = (int)amt;
  }else{
    rc = vdbeMemFromBtreeResize(pCur, offset, amt, pMem);
  }

  return rc;
}

/*
** The pVal argument is known to be a value other than NULL.
................................................................................
SQLITE_PRIVATE void sqlite3ExplainBreakpoint(const char *z1, const char *z2){
  (void)z1;
  (void)z2;
}
#endif

/*
** Add a new OP_ opcode.
**
** If the bPush flag is true, then make this opcode the parent for
** subsequent Explains until sqlite3VdbeExplainPop() is called.
*/
SQLITE_PRIVATE void sqlite3VdbeExplain(Parse *pParse, u8 bPush, const char *zFmt, ...){
#ifndef SQLITE_DEBUG
  /* Always include the OP_Explain opcodes if SQLITE_DEBUG is defined.
................................................................................
** Change the P2 operand of instruction addr so that it points to
** the address of the next instruction to be coded.
*/
SQLITE_PRIVATE void sqlite3VdbeJumpHere(Vdbe *p, int addr){
  sqlite3VdbeChangeP2(p, addr, p->nOp);
}






























/*
** If the input FuncDef structure is ephemeral, then free it.  If
** the FuncDef is not ephermal, then do nothing.
*/
static void freeEphemeralFunction(sqlite3 *db, FuncDef *pDef){
  if( (pDef->funcFlags & SQLITE_FUNC_EPHEM)!=0 ){
................................................................................
** Some translation occurs:
**
**       "PX"      ->  "r[X]"
**       "PX@PY"   ->  "r[X..X+Y-1]"  or "r[x]" if y is 0 or 1
**       "PX@PY+1" ->  "r[X..X+Y]"    or "r[x]" if y is 0
**       "PY..PY"  ->  "r[X..Y]"      or "r[x]" if y<=x
*/
static int displayComment(

  const Op *pOp,     /* The opcode to be commented */
  const char *zP4,   /* Previously obtained value for P4 */
  char *zTemp,       /* Write result here */
  int nTemp          /* Space available in zTemp[] */
){
  const char *zOpName;
  const char *zSynopsis;
  int nOpName;
  int ii, jj;
  char zAlt[50];



  zOpName = sqlite3OpcodeName(pOp->opcode);
  nOpName = sqlite3Strlen30(zOpName);
  if( zOpName[nOpName+1] ){
    int seenCom = 0;
    char c;
    zSynopsis = zOpName += nOpName + 1;
    if( strncmp(zSynopsis,"IF ",3)==0 ){
................................................................................
      if( pOp->p5 & SQLITE_STOREP2 ){
        sqlite3_snprintf(sizeof(zAlt), zAlt, "r[P2] = (%s)", zSynopsis+3);
      }else{
        sqlite3_snprintf(sizeof(zAlt), zAlt, "if %s goto P2", zSynopsis+3);
      }
      zSynopsis = zAlt;
    }
    for(ii=jj=0; jj<nTemp-1 && (c = zSynopsis[ii])!=0; ii++){
      if( c=='P' ){
        c = zSynopsis[++ii];
        if( c=='4' ){
          sqlite3_snprintf(nTemp-jj, zTemp+jj, "%s", zP4);
        }else if( c=='X' ){
          sqlite3_snprintf(nTemp-jj, zTemp+jj, "%s", pOp->zComment);
          seenCom = 1;
        }else{
          int v1 = translateP(c, pOp);
          int v2;
          sqlite3_snprintf(nTemp-jj, zTemp+jj, "%d", v1);
          if( strncmp(zSynopsis+ii+1, "@P", 2)==0 ){
            ii += 3;
            jj += sqlite3Strlen30(zTemp+jj);
            v2 = translateP(zSynopsis[ii], pOp);
            if( strncmp(zSynopsis+ii+1,"+1",2)==0 ){
              ii += 2;
              v2++;
            }
            if( v2>1 ){


              sqlite3_snprintf(nTemp-jj, zTemp+jj, "..%d", v1+v2-1);
            }














          }else if( strncmp(zSynopsis+ii+1, "..P3", 4)==0 && pOp->p3==0 ){
            ii += 4;
          }
        }
        jj += sqlite3Strlen30(zTemp+jj);

      }else{
        zTemp[jj++] = c;

      }
    }
    if( !seenCom && jj<nTemp-5 && pOp->zComment ){
      sqlite3_snprintf(nTemp-jj, zTemp+jj, "; %s", pOp->zComment);
      jj += sqlite3Strlen30(zTemp+jj);
    }
    if( jj<nTemp ) zTemp[jj] = 0;
  }else if( pOp->zComment ){
    sqlite3_snprintf(nTemp, zTemp, "%s", pOp->zComment);
    jj = sqlite3Strlen30(zTemp);
  }else{
    zTemp[0] = 0;
    jj = 0;
  }
  return jj;


}


#endif /* SQLITE_DEBUG */

#if VDBE_DISPLAY_P4 && defined(SQLITE_ENABLE_CURSOR_HINTS)
/*
** Translate the P4.pExpr value for an OP_CursorHint opcode into text
** that can be displayed in the P4 column of EXPLAIN output.
*/
static void displayP4Expr(StrAccum *p, Expr *pExpr){
................................................................................


#if VDBE_DISPLAY_P4
/*
** Compute a string that describes the P4 parameter for an opcode.
** Use zTemp for any required temporary buffer space.
*/
static char *displayP4(Op *pOp, char *zTemp, int nTemp){
  char *zP4 = zTemp;
  StrAccum x;
  assert( nTemp>=20 );

  sqlite3StrAccumInit(&x, 0, zTemp, nTemp, 0);
  switch( pOp->p4type ){
    case P4_KEYINFO: {
      int j;
      KeyInfo *pKeyInfo = pOp->p4.pKeyInfo;
      assert( pKeyInfo->aSortFlags!=0 );
      sqlite3_str_appendf(&x, "k(%d", pKeyInfo->nKeyField);
      for(j=0; j<pKeyInfo->nKeyField; j++){
................................................................................
#ifdef SQLITE_ENABLE_CURSOR_HINTS
    case P4_EXPR: {
      displayP4Expr(&x, pOp->p4.pExpr);
      break;
    }
#endif
    case P4_COLLSEQ: {

      CollSeq *pColl = pOp->p4.pColl;

      sqlite3_str_appendf(&x, "(%.20s)", pColl->zName);

      break;
    }
    case P4_FUNCDEF: {
      FuncDef *pDef = pOp->p4.pFunc;
      sqlite3_str_appendf(&x, "%s(%d)", pDef->zName, pDef->nArg);
      break;
    }
................................................................................
#endif
    case P4_INTARRAY: {
      int i;
      int *ai = pOp->p4.ai;
      int n = ai[0];   /* The first element of an INTARRAY is always the
                       ** count of the number of elements to follow */
      for(i=1; i<=n; i++){
        sqlite3_str_appendf(&x, ",%d", ai[i]);
      }
      zTemp[0] = '[';
      sqlite3_str_append(&x, "]", 1);
      break;
    }
    case P4_SUBPROGRAM: {
      sqlite3_str_appendf(&x, "program");
      break;
    }
    case P4_DYNBLOB:
    case P4_ADVANCE: {
      zTemp[0] = 0;
      break;
    }
    case P4_TABLE: {
      sqlite3_str_appendf(&x, "%s", pOp->p4.pTab->zName);
      break;
    }
    default: {
      zP4 = pOp->p4.z;
      if( zP4==0 ){
        zP4 = zTemp;
        zTemp[0] = 0;
      }
    }



  }
  sqlite3StrAccumFinish(&x);
  assert( zP4!=0 );
  return zP4;
}
#endif /* VDBE_DISPLAY_P4 */

/*
** Declare to the Vdbe that the BTree object at db->aDb[i] is used.
**
** The prepared statements need to know in advance the complete set of
................................................................................

#if defined(VDBE_PROFILE) || defined(SQLITE_DEBUG)
/*
** Print a single opcode.  This routine is used for debugging only.
*/
SQLITE_PRIVATE void sqlite3VdbePrintOp(FILE *pOut, int pc, VdbeOp *pOp){
  char *zP4;
  char zPtr[50];
  char zCom[100];
  static const char *zFormat1 = "%4d %-13s %4d %4d %4d %-13s %.2X %s\n";
  if( pOut==0 ) pOut = stdout;
  zP4 = displayP4(pOp, zPtr, sizeof(zPtr));


#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
  displayComment(pOp, zP4, zCom, sizeof(zCom));

#else
  zCom[0] = 0;
#endif
  /* NB:  The sqlite3OpcodeName() function is implemented by code created
  ** by the mkopcodeh.awk and mkopcodec.awk scripts which extract the
  ** information from the vdbe.c source text */
  fprintf(pOut, zFormat1, pc, 
      sqlite3OpcodeName(pOp->opcode), pOp->p1, pOp->p2, pOp->p3, zP4, pOp->p5,

      zCom
  );
  fflush(pOut);



}
#endif

/*
** Initialize an array of N Mem element.
*/
static void initMemArray(Mem *p, int N, sqlite3 *db, u16 flags){
................................................................................
SQLITE_PRIVATE void sqlite3VdbeFrameMemDel(void *pArg){
  VdbeFrame *pFrame = (VdbeFrame*)pArg;
  assert( sqlite3VdbeFrameIsValid(pFrame) );
  pFrame->pParent = pFrame->v->pDelFrame;
  pFrame->v->pDelFrame = pFrame;
}





















































































































/*
** Delete a VdbeFrame object and its contents. VdbeFrame objects are
** allocated by the OP_Program opcode in sqlite3VdbeExec().
*/
SQLITE_PRIVATE void sqlite3VdbeFrameDelete(VdbeFrame *p){
  int i;
................................................................................
**
** When p->explain==1, first the main program is listed, then each of
** the trigger subprograms are listed one by one.
*/
SQLITE_PRIVATE int sqlite3VdbeList(
  Vdbe *p                   /* The VDBE */
){
  int nRow;                            /* Stop when row count reaches this */
  int nSub = 0;                        /* Number of sub-vdbes seen so far */
  SubProgram **apSub = 0;              /* Array of sub-vdbes */
  Mem *pSub = 0;                       /* Memory cell hold array of subprogs */
  sqlite3 *db = p->db;                 /* The database connection */
  int i;                               /* Loop counter */
  int rc = SQLITE_OK;                  /* Return code */
  Mem *pMem = &p->aMem[1];             /* First Mem of result set */
  int bListSubprogs = (p->explain==1 || (db->flags & SQLITE_TriggerEQP)!=0);
  Op *pOp = 0;


  assert( p->explain );
  assert( p->magic==VDBE_MAGIC_RUN );
  assert( p->rc==SQLITE_OK || p->rc==SQLITE_BUSY || p->rc==SQLITE_NOMEM );

  /* Even though this opcode does not use dynamic strings for
  ** the result, result columns may become dynamic if the user calls
................................................................................
  if( p->rc==SQLITE_NOMEM ){
    /* This happens if a malloc() inside a call to sqlite3_column_text() or
    ** sqlite3_column_text16() failed.  */
    sqlite3OomFault(db);
    return SQLITE_ERROR;
  }

  /* When the number of output rows reaches nRow, that means the
  ** listing has finished and sqlite3_step() should return SQLITE_DONE.
  ** nRow is the sum of the number of rows in the main program, plus
  ** the sum of the number of rows in all trigger subprograms encountered
  ** so far.  The nRow value will increase as new trigger subprograms are
  ** encountered, but p->pc will eventually catch up to nRow.
  */
  nRow = p->nOp;
  if( bListSubprogs ){
    /* The first 8 memory cells are used for the result set.  So we will
    ** commandeer the 9th cell to use as storage for an array of pointers
    ** to trigger subprograms.  The VDBE is guaranteed to have at least 9
    ** cells.  */
    assert( p->nMem>9 );
    pSub = &p->aMem[9];
    if( pSub->flags&MEM_Blob ){
      /* On the first call to sqlite3_step(), pSub will hold a NULL.  It is
      ** initialized to a BLOB by the P4_SUBPROGRAM processing logic below */
      nSub = pSub->n/sizeof(Vdbe*);
      apSub = (SubProgram **)pSub->z;
    }
    for(i=0; i<nSub; i++){
      nRow += apSub[i]->nOp;
    }
  }

  while(1){  /* Loop exits via break */
    i = p->pc++;
    if( i>=nRow ){
      p->rc = SQLITE_OK;
      rc = SQLITE_DONE;
      break;
    }
    if( i<p->nOp ){
      /* The output line number is small enough that we are still in the
      ** main program. */
      pOp = &p->aOp[i];
    }else{
      /* We are currently listing subprograms.  Figure out which one and
      ** pick up the appropriate opcode. */
      int j;
      i -= p->nOp;
      assert( apSub!=0 );
      assert( nSub>0 );
      for(j=0; i>=apSub[j]->nOp; j++){
        i -= apSub[j]->nOp;
        assert( i<apSub[j]->nOp || j+1<nSub );
      }
      pOp = &apSub[j]->aOp[i];
    }

    /* When an OP_Program opcode is encounter (the only opcode that has
    ** a P4_SUBPROGRAM argument), expand the size of the array of subprograms
    ** kept in p->aMem[9].z to hold the new program - assuming this subprogram
    ** has not already been seen.
    */
    if( bListSubprogs && pOp->p4type==P4_SUBPROGRAM ){
      int nByte = (nSub+1)*sizeof(SubProgram*);
      int j;
      for(j=0; j<nSub; j++){
        if( apSub[j]==pOp->p4.pProgram ) break;
      }
      if( j==nSub ){
        p->rc = sqlite3VdbeMemGrow(pSub, nByte, nSub!=0);
        if( p->rc!=SQLITE_OK ){
          rc = SQLITE_ERROR;
          break;
        }
        apSub = (SubProgram **)pSub->z;
        apSub[nSub++] = pOp->p4.pProgram;
        pSub->flags |= MEM_Blob;
        pSub->n = nSub*sizeof(SubProgram*);
        nRow += pOp->p4.pProgram->nOp;
      }


    }
    if( p->explain<2 ) break;
    if( pOp->opcode==OP_Explain ) break;
    if( pOp->opcode==OP_Init && p->pc>1 ) break;
  }

  if( rc==SQLITE_OK ){

    if( db->u1.isInterrupted ){
      p->rc = SQLITE_INTERRUPT;
      rc = SQLITE_ERROR;
      sqlite3VdbeError(p, sqlite3ErrStr(p->rc));
    }else{
      char *zP4;

      if( p->explain==1 ){
        pMem->flags = MEM_Int;
        pMem->u.i = i;                                /* Program counter */
        pMem++;
    
        pMem->flags = MEM_Static|MEM_Str|MEM_Term;







        pMem->z = (char*)sqlite3OpcodeName(pOp->opcode); /* Opcode */
        assert( pMem->z!=0 );
        pMem->n = sqlite3Strlen30(pMem->z);
        pMem->enc = SQLITE_UTF8;
        pMem++;
      }







      pMem->flags = MEM_Int;
      pMem->u.i = pOp->p1;                          /* P1 */
      pMem++;



      pMem->flags = MEM_Int;
      pMem->u.i = pOp->p2;                          /* P2 */
      pMem++;

      pMem->flags = MEM_Int;
      pMem->u.i = pOp->p3;                          /* P3 */
      pMem++;

      if( sqlite3VdbeMemClearAndResize(pMem, 100) ){ /* P4 */
        assert( p->db->mallocFailed );
        return SQLITE_ERROR;
      }
      pMem->flags = MEM_Str|MEM_Term;
      zP4 = displayP4(pOp, pMem->z, pMem->szMalloc);
      if( zP4!=pMem->z ){
        pMem->n = 0;
        sqlite3VdbeMemSetStr(pMem, zP4, -1, SQLITE_UTF8, 0);
      }else{
        assert( pMem->z!=0 );
        pMem->n = sqlite3Strlen30(pMem->z);
        pMem->enc = SQLITE_UTF8;
      }
      pMem++;

      if( p->explain==1 ){
        if( sqlite3VdbeMemClearAndResize(pMem, 4) ){
          assert( p->db->mallocFailed );
          return SQLITE_ERROR;



        }
        pMem->flags = MEM_Str|MEM_Term;
        pMem->n = 2;
        sqlite3_snprintf(3, pMem->z, "%.2x", pOp->p5);   /* P5 */
        pMem->enc = SQLITE_UTF8;
        pMem++;
    
#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
        if( sqlite3VdbeMemClearAndResize(pMem, 500) ){

          assert( p->db->mallocFailed );
          return SQLITE_ERROR;
        }
        pMem->flags = MEM_Str|MEM_Term;
        pMem->n = displayComment(pOp, zP4, pMem->z, 500);
        pMem->enc = SQLITE_UTF8;
#else
        pMem->flags = MEM_Null;                       /* Comment */
#endif
      }

      p->nResColumn = 8 - 4*(p->explain-1);
      p->pResultSet = &p->aMem[1];
      p->rc = SQLITE_OK;
      rc = SQLITE_ROW;

    }
  }
  return rc;
}
#endif /* SQLITE_OMIT_EXPLAIN */

#ifdef SQLITE_DEBUG
................................................................................
  if( pParse->explain ){
    static const char * const azColName[] = {
       "addr", "opcode", "p1", "p2", "p3", "p4", "p5", "comment",
       "id", "parent", "notused", "detail"
    };
    int iFirst, mx, i;
    if( nMem<10 ) nMem = 10;

    if( pParse->explain==2 ){
      sqlite3VdbeSetNumCols(p, 4);
      iFirst = 8;
      mx = 12;
    }else{
      sqlite3VdbeSetNumCols(p, 8);
      iFirst = 0;
................................................................................
      p->anExec = allocSpace(&x, p->anExec, p->nOp*sizeof(i64));
#endif
    }
  }

  p->pVList = pParse->pVList;
  pParse->pVList =  0;
  p->explain = pParse->explain;
  if( db->mallocFailed ){
    p->nVar = 0;
    p->nCursor = 0;
    p->nMem = 0;
  }else{
    p->nCursor = nCursor;
    p->nVar = (ynVar)nVar;
................................................................................
    i64 offset = 0;
    int res;
    int retryCount = 0;
    int nMainFile;

    /* Select a master journal file name */
    nMainFile = sqlite3Strlen30(zMainFile);
    zMaster = sqlite3MPrintf(db, "%s-mjXXXXXX9XXz%c%c", zMainFile, 0, 0);
    if( zMaster==0 ) return SQLITE_NOMEM_BKPT;

    do {
      u32 iRandom;
      if( retryCount ){
        if( retryCount>100 ){
          sqlite3_log(SQLITE_FULL, "MJ delete: %s", zMaster);
          sqlite3OsDelete(pVfs, zMaster, 0);
          break;
................................................................................
      /* Open the master journal. */
      rc = sqlite3OsOpenMalloc(pVfs, zMaster, &pMaster, 
          SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE|
          SQLITE_OPEN_EXCLUSIVE|SQLITE_OPEN_MASTER_JOURNAL, 0
      );
    }
    if( rc!=SQLITE_OK ){
      sqlite3DbFree(db, zMaster);
      return rc;
    }
 
    /* Write the name of each database file in the transaction into the new
    ** master journal file. If an error occurs at this point close
    ** and delete the master journal file. All the individual journal files
    ** still have 'null' as the master journal pointer, so they will roll
................................................................................
        }
        assert( zFile[0]!=0 );
        rc = sqlite3OsWrite(pMaster, zFile, sqlite3Strlen30(zFile)+1, offset);
        offset += sqlite3Strlen30(zFile)+1;
        if( rc!=SQLITE_OK ){
          sqlite3OsCloseFree(pMaster);
          sqlite3OsDelete(pVfs, zMaster, 0);
          sqlite3DbFree(db, zMaster);
          return rc;
        }
      }
    }

    /* Sync the master journal file. If the IOCAP_SEQUENTIAL device
    ** flag is set this is not required.
    */
    if( 0==(sqlite3OsDeviceCharacteristics(pMaster)&SQLITE_IOCAP_SEQUENTIAL)
     && SQLITE_OK!=(rc = sqlite3OsSync(pMaster, SQLITE_SYNC_NORMAL))
    ){
      sqlite3OsCloseFree(pMaster);
      sqlite3OsDelete(pVfs, zMaster, 0);
      sqlite3DbFree(db, zMaster);
      return rc;
    }

    /* Sync all the db files involved in the transaction. The same call
    ** sets the master journal pointer in each individual journal. If
    ** an error occurs here, do not delete the master journal file.
    **
................................................................................
      if( pBt ){
        rc = sqlite3BtreeCommitPhaseOne(pBt, zMaster);
      }
    }
    sqlite3OsCloseFree(pMaster);
    assert( rc!=SQLITE_BUSY );
    if( rc!=SQLITE_OK ){
      sqlite3DbFree(db, zMaster);
      return rc;
    }

    /* Delete the master journal file. This commits the transaction. After
    ** doing this the directory is synced again before any individual
    ** transaction files are deleted.
    */
    rc = sqlite3OsDelete(pVfs, zMaster, 1);
    sqlite3DbFree(db, zMaster);
    zMaster = 0;
    if( rc ){
      return rc;
    }

    /* All files and directories have already been synced, so the following
    ** calls to sqlite3BtreeCommitPhaseTwo() are only closing files and
................................................................................
** not been deleted out from under the cursor, then this routine is a no-op.
*/
SQLITE_PRIVATE int sqlite3VdbeCursorMoveto(VdbeCursor **pp, int *piCol){
  VdbeCursor *p = *pp;
  assert( p->eCurType==CURTYPE_BTREE || p->eCurType==CURTYPE_PSEUDO );
  if( p->deferredMoveto ){
    int iMap;
    if( p->aAltMap && (iMap = p->aAltMap[1+*piCol])>0 ){
      *pp = p->pAltCursor;
      *piCol = iMap - 1;
      return SQLITE_OK;
    }
    return sqlite3VdbeFinishMoveto(p);
  }
  if( sqlite3BtreeCursorHasMoved(p->uc.pCursor) ){
................................................................................
          rc = sqlite3IntFloatCompare(mem1.u.i, pRhs->u.r);
        }
      }
    }

    /* RHS is a string */
    else if( pRhs->flags & MEM_Str ){
      getVarint32(&aKey1[idx1], serial_type);
      testcase( serial_type==12 );
      if( serial_type<12 ){
        rc = -1;
      }else if( !(serial_type & 0x01) ){
        rc = +1;
      }else{
        mem1.n = (serial_type - 12) / 2;
................................................................................
        }
      }
    }

    /* RHS is a blob */
    else if( pRhs->flags & MEM_Blob ){
      assert( (pRhs->flags & MEM_Zero)==0 || pRhs->n==0 );
      getVarint32(&aKey1[idx1], serial_type);
      testcase( serial_type==12 );
      if( serial_type<12 || (serial_type & 0x01) ){
        rc = -1;
      }else{
        int nStr = (serial_type - 12) / 2;
        testcase( (d1+nStr)==(unsigned)nKey1 );
        testcase( (d1+nStr+1)==(unsigned)nKey1 );
................................................................................
){
  const u8 *aKey1 = (const u8*)pKey1;
  int serial_type;
  int res;

  assert( pPKey2->aMem[0].flags & MEM_Str );
  vdbeAssertFieldCountWithinLimits(nKey1, pKey1, pPKey2->pKeyInfo);


  getVarint32(&aKey1[1], serial_type);

  if( serial_type<12 ){
    res = pPKey2->r1;      /* (pKey1/nKey1) is a number or a null */
  }else if( !(serial_type & 0x01) ){ 
    res = pPKey2->r2;      /* (pKey1/nKey1) is a blob */
  }else{
    int nCmp;
    int nStr;
................................................................................
  */
  assert( sqlite3BtreeCursorIsValid(pCur) );
  nCellKey = sqlite3BtreePayloadSize(pCur);
  assert( (nCellKey & SQLITE_MAX_U32)==(u64)nCellKey );

  /* Read in the complete content of the index entry */
  sqlite3VdbeMemInit(&m, db, 0);
  rc = sqlite3VdbeMemFromBtree(pCur, 0, (u32)nCellKey, &m);
  if( rc ){
    return rc;
  }

  /* The index entry must begin with a header size */
  (void)getVarint32((u8*)m.z, szHdr);
  testcase( szHdr==3 );
  testcase( szHdr==m.n );
  testcase( szHdr>0x7fffffff );
  assert( m.n>=0 );
  if( unlikely(szHdr<3 || szHdr>(unsigned)m.n) ){
    goto idx_rowid_corruption;
  }

  /* The last field of the index should be an integer - the ROWID.
  ** Verify that the last entry really is an integer. */
  (void)getVarint32((u8*)&m.z[szHdr-1], typeRowid);
  testcase( typeRowid==1 );
  testcase( typeRowid==2 );
  testcase( typeRowid==3 );
  testcase( typeRowid==4 );
  testcase( typeRowid==5 );
  testcase( typeRowid==6 );
  testcase( typeRowid==8 );
................................................................................
  /* nCellKey will always be between 0 and 0xffffffff because of the way
  ** that btreeParseCellPtr() and sqlite3GetVarint32() are implemented */
  if( nCellKey<=0 || nCellKey>0x7fffffff ){
    *res = 0;
    return SQLITE_CORRUPT_BKPT;
  }
  sqlite3VdbeMemInit(&m, db, 0);
  rc = sqlite3VdbeMemFromBtree(pCur, 0, (u32)nCellKey, &m);
  if( rc ){
    return rc;
  }
  *res = sqlite3VdbeRecordCompareWithSkip(m.n, m.z, pUnpacked, 0);
  sqlite3VdbeMemRelease(&m);
  return SQLITE_OK;
}
................................................................................
  }
  if( p->pc<0 ){
    /* If there are no other statements currently running, then
    ** reset the interrupt flag.  This prevents a call to sqlite3_interrupt
    ** from interrupting a statement that has not yet started.
    */
    if( db->nVdbeActive==0 ){
      db->u1.isInterrupted = 0;
    }

    assert( db->nVdbeWrite>0 || db->autoCommit==0 
        || (db->nDeferredCons==0 && db->nDeferredImmCons==0)
    );

#ifndef SQLITE_OMIT_TRACE
................................................................................
  sqlite3VdbeMemRelease(pVar);
  pVar->flags = MEM_Null;
  p->db->errCode = SQLITE_OK;

  /* If the bit corresponding to this variable in Vdbe.expmask is set, then 
  ** binding a new value to this variable invalidates the current query plan.
  **
  ** IMPLEMENTATION-OF: R-48440-37595 If the specific value bound to host
  ** parameter in the WHERE clause might influence the choice of query plan
  ** for a statement, then the statement will be automatically recompiled,
  ** as if there had been a schema change, on the first sqlite3_step() call
  ** following any change to the bindings of that parameter.
  */
  assert( (p->prepFlags & SQLITE_PREPARE_SAVESQL)!=0 || p->expmask==0 );
  if( p->expmask!=0 && (p->expmask & (i>=31 ? 0x80000000 : (u32)1<<i))!=0 ){
................................................................................
    }
    sqlite3_str_appendf(pStr,"]");
    if( f & MEM_Zero ){
      sqlite3_str_appendf(pStr, "+%dz",pMem->u.nZero);
    }
  }else if( f & MEM_Str ){
    int j;
    int c;
    if( f & MEM_Dyn ){
      c = 'z';
      assert( (f & (MEM_Static|MEM_Ephem))==0 );
    }else if( f & MEM_Static ){
      c = 't';
      assert( (f & (MEM_Dyn|MEM_Ephem))==0 );
    }else if( f & MEM_Ephem ){
................................................................................
      c = 'e';
      assert( (f & (MEM_Static|MEM_Dyn))==0 );
    }else{
      c = 's';
    }
    sqlite3_str_appendf(pStr, " %c%d[", c, pMem->n);
    for(j=0; j<25 && j<pMem->n; j++){
      u8 c = pMem->z[j];
      sqlite3_str_appendchar(pStr, 1, (c>=0x20&&c<=0x7f) ? c : '.');
    }
    sqlite3_str_appendf(pStr, "]%s", encnames[pMem->enc]);
  }
}
#endif

................................................................................
  }
  assert( p->rc==SQLITE_OK || (p->rc&0xff)==SQLITE_BUSY );
  assert( p->bIsReader || p->readOnly!=0 );
  p->iCurrentTime = 0;
  assert( p->explain==0 );
  p->pResultSet = 0;
  db->busyHandler.nBusy = 0;
  if( db->u1.isInterrupted ) goto abort_due_to_interrupt;
  sqlite3VdbeIOTraceSql(p);
#ifdef SQLITE_DEBUG
  sqlite3BeginBenignMalloc();
  if( p->pc==0
   && (p->db->flags & (SQLITE_VdbeListing|SQLITE_VdbeEQP|SQLITE_VdbeTrace))!=0
  ){
    int i;
................................................................................
  **
  ** This code uses unstructured "goto" statements and does not look clean.
  ** But that is not due to sloppy coding habits. The code is written this
  ** way for performance, to avoid having to run the interrupt and progress
  ** checks on every opcode.  This helps sqlite3_step() to run about 1.5%
  ** faster according to "valgrind --tool=cachegrind" */
check_for_interrupt:
  if( db->u1.isInterrupted ) goto abort_due_to_interrupt;
#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
  /* Call the progress callback if it is configured and the required number
  ** of VDBE ops have been executed (either since this invocation of
  ** sqlite3VdbeExec() or since last time the progress callback was called).
  ** If the progress callback returns non-zero, exit the virtual machine with
  ** a return code SQLITE_ABORT.
  */
................................................................................
  i64 nByte;          /* Total size of the output string or blob */
  u16 flags1;         /* Initial flags for P1 */
  u16 flags2;         /* Initial flags for P2 */

  pIn1 = &aMem[pOp->p1];
  pIn2 = &aMem[pOp->p2];
  pOut = &aMem[pOp->p3];
  testcase( pIn1==pIn2 );
  testcase( pOut==pIn2 );
  assert( pIn1!=pOut );
  flags1 = pIn1->flags;
  testcase( flags1 & MEM_Null );
  testcase( pIn2->flags & MEM_Null );
  if( (flags1 | pIn2->flags) & MEM_Null ){
    sqlite3VdbeMemSetNull(pOut);
................................................................................
  }else{
    /* Neither operand is NULL.  Do a comparison. */
    affinity = pOp->p5 & SQLITE_AFF_MASK;
    if( affinity>=SQLITE_AFF_NUMERIC ){
      if( (flags1 | flags3)&MEM_Str ){
        if( (flags1 & (MEM_Int|MEM_IntReal|MEM_Real|MEM_Str))==MEM_Str ){
          applyNumericAffinity(pIn1,0);
          testcase( flags3!=pIn3->flags );
          flags3 = pIn3->flags;
        }
        if( (flags3 & (MEM_Int|MEM_IntReal|MEM_Real|MEM_Str))==MEM_Str ){
          applyNumericAffinity(pIn3,0);
        }
      }
      /* Handle the common case of integer comparison here, as an
................................................................................
      if( (flags1 & MEM_Str)==0 && (flags1&(MEM_Int|MEM_Real|MEM_IntReal))!=0 ){
        testcase( pIn1->flags & MEM_Int );
        testcase( pIn1->flags & MEM_Real );
        testcase( pIn1->flags & MEM_IntReal );
        sqlite3VdbeMemStringify(pIn1, encoding, 1);
        testcase( (flags1&MEM_Dyn) != (pIn1->flags&MEM_Dyn) );
        flags1 = (pIn1->flags & ~MEM_TypeMask) | (flags1 & MEM_TypeMask);
        if( pIn1==pIn3 ) flags3 = flags1 | MEM_Str;
      }
      if( (flags3 & MEM_Str)==0 && (flags3&(MEM_Int|MEM_Real|MEM_IntReal))!=0 ){
        testcase( pIn3->flags & MEM_Int );
        testcase( pIn3->flags & MEM_Real );
        testcase( pIn3->flags & MEM_IntReal );
        sqlite3VdbeMemStringify(pIn3, encoding, 1);
        testcase( (flags3&MEM_Dyn) != (pIn3->flags&MEM_Dyn) );
................................................................................
    /* If there is more header available for parsing in the record, try
    ** to extract additional fields up through the p2+1-th field 
    */
    if( pC->iHdrOffset<aOffset[0] ){
      /* Make sure zData points to enough of the record to cover the header. */
      if( pC->aRow==0 ){
        memset(&sMem, 0, sizeof(sMem));
        rc = sqlite3VdbeMemFromBtree(pC->uc.pCursor, 0, aOffset[0], &sMem);
        if( rc!=SQLITE_OK ) goto abort_due_to_error;
        zData = (u8*)sMem.z;
      }else{
        zData = pC->aRow;
      }
  
      /* Fill in pC->aType[i] and aOffset[i] values through the p2-th field. */
................................................................................
  assert( nByte==(int)(zPayload - (u8*)pOut->z) );

  assert( pOp->p3>0 && pOp->p3<=(p->nMem+1 - p->nCursor) );
  REGISTER_TRACE(pOp->p3, pOut);
  break;
}

/* Opcode: Count P1 P2 * * *
** Synopsis: r[P2]=count()
**
** Store the number of entries (an integer value) in the table or index 
** opened by cursor P1 in register P2




*/
#ifndef SQLITE_OMIT_BTREECOUNT
case OP_Count: {         /* out2 */
  i64 nEntry;
  BtCursor *pCrsr;

  assert( p->apCsr[pOp->p1]->eCurType==CURTYPE_BTREE );
  pCrsr = p->apCsr[pOp->p1]->uc.pCursor;
  assert( pCrsr );



  nEntry = 0;  /* Not needed.  Only used to silence a warning. */
  rc = sqlite3BtreeCount(db, pCrsr, &nEntry);
  if( rc ) goto abort_due_to_error;

  pOut = out2Prerelease(p, pOp);
  pOut->u.i = nEntry;
  goto check_for_interrupt;
}
#endif

/* Opcode: Savepoint P1 * * P4 *
**
** Open, release or rollback the savepoint named by parameter P4, depending
** on the value of P1. To open a new savepoint set P1==0 (SAVEPOINT_BEGIN).
** To release (commit) an existing savepoint set P1==1 (SAVEPOINT_RELEASE).
** To rollback an existing savepoint set P1==2 (SAVEPOINT_ROLLBACK).
................................................................................
** values need not be contiguous but all P1 values should be small integers.
** It is an error for P1 to be negative.
**
** Allowed P5 bits:
** <ul>
** <li>  <b>0x02 OPFLAG_SEEKEQ</b>: This cursor will only be used for
**       equality lookups (implemented as a pair of opcodes OP_SeekGE/OP_IdxGT
**       of OP_SeekLE/OP_IdxGT)
** </ul>
**
** The P4 value may be either an integer (P4_INT32) or a pointer to
** a KeyInfo structure (P4_KEYINFO). If it is a pointer to a KeyInfo 
** object, then table being opened must be an [index b-tree] where the
** KeyInfo object defines the content and collating 
** sequence of that index b-tree. Otherwise, if P4 is an integer 
................................................................................
** be the same as every other ReopenIdx or OpenRead for the same cursor
** number.
**
** Allowed P5 bits:
** <ul>
** <li>  <b>0x02 OPFLAG_SEEKEQ</b>: This cursor will only be used for
**       equality lookups (implemented as a pair of opcodes OP_SeekGE/OP_IdxGT
**       of OP_SeekLE/OP_IdxGT)
** </ul>
**
** See also: OP_OpenRead, OP_OpenWrite
*/
/* Opcode: OpenWrite P1 P2 P3 P4 P5
** Synopsis: root=P2 iDb=P3
**
................................................................................
** value, then the table being opened must be a [table b-tree] with a
** number of columns no less than the value of P4.
**
** Allowed P5 bits:
** <ul>
** <li>  <b>0x02 OPFLAG_SEEKEQ</b>: This cursor will only be used for
**       equality lookups (implemented as a pair of opcodes OP_SeekGE/OP_IdxGT
**       of OP_SeekLE/OP_IdxGT)
** <li>  <b>0x08 OPFLAG_FORDELETE</b>: This cursor is used only to seek
**       and subsequently delete entries in an index btree.  This is a
**       hint to the storage engine that the storage engine is allowed to
**       ignore.  The hint is not used by the official SQLite b*tree storage
**       engine, but is used by COMDB2.
** <li>  <b>0x10 OPFLAG_P2ISREG</b>: Use the content of register P2
**       as the root page, not the value of P2 itself.
................................................................................
  ** since moved into the btree layer.  */  
  pCur->isTable = pOp->p4type!=P4_KEYINFO;

open_cursor_set_hints:
  assert( OPFLAG_BULKCSR==BTREE_BULKLOAD );
  assert( OPFLAG_SEEKEQ==BTREE_SEEK_EQ );
  testcase( pOp->p5 & OPFLAG_BULKCSR );
#ifdef SQLITE_ENABLE_CURSOR_HINTS
  testcase( pOp->p2 & OPFLAG_SEEKEQ );
#endif
  sqlite3BtreeCursorHintFlags(pCur->uc.pCursor,
                               (pOp->p5 & (OPFLAG_BULKCSR|OPFLAG_SEEKEQ)));
  if( rc ) goto abort_due_to_error;
  break;
}

/* Opcode: OpenDup P1 P2 * * *
................................................................................
** that are used as an unpacked index key. 
**
** Reposition cursor P1 so that  it points to the smallest entry that 
** is greater than or equal to the key value. If there are no records 
** greater than or equal to the key and P2 is not zero, then jump to P2.
**
** If the cursor P1 was opened using the OPFLAG_SEEKEQ flag, then this
** opcode will always land on a record that equally equals the key, or
** else jump immediately to P2.  When the cursor is OPFLAG_SEEKEQ, this
** opcode must be followed by an IdxLE opcode with the same arguments.
** The IdxLE opcode will be skipped if this opcode succeeds, but the
** IdxLE opcode will be used on subsequent loop iterations.


**
** This opcode leaves the cursor configured to move in forward order,
** from the beginning toward the end.  In other words, the cursor is
** configured to use Next, not Prev.
**
** See also: Found, NotFound, SeekLt, SeekGt, SeekLe
*/
................................................................................
** Synopsis: key=r[P3@P4]
**
** If cursor P1 refers to an SQL table (B-Tree that uses integer keys), 
** use the value in register P3 as a key. If cursor P1 refers 
** to an SQL index, then P3 is the first in an array of P4 registers 
** that are used as an unpacked index key. 
**
** Reposition cursor P1 so that  it points to the smallest entry that 
** is greater than the key value. If there are no records greater than 
** the key and P2 is not zero, then jump to P2.
**
** This opcode leaves the cursor configured to move in forward order,
** from the beginning toward the end.  In other words, the cursor is
** configured to use Next, not Prev.
**
................................................................................
** less than or equal to the key and P2 is not zero, then jump to P2.
**
** This opcode leaves the cursor configured to move in reverse order,
** from the end toward the beginning.  In other words, the cursor is
** configured to use Prev, not Next.
**
** If the cursor P1 was opened using the OPFLAG_SEEKEQ flag, then this
** opcode will always land on a record that equally equals the key, or
** else jump immediately to P2.  When the cursor is OPFLAG_SEEKEQ, this
** opcode must be followed by an IdxGE opcode with the same arguments.
** The IdxGE opcode will be skipped if this opcode succeeds, but the
** IdxGE opcode will be used on subsequent loop iterations.


**
** See also: Found, NotFound, SeekGt, SeekGe, SeekLt
*/
case OP_SeekLT:         /* jump, in3, group */
case OP_SeekLE:         /* jump, in3, group */
case OP_SeekGE:         /* jump, in3, group */
case OP_SeekGT: {       /* jump, in3, group */
................................................................................
  pC->seekOp = pOp->opcode;
#endif

  pC->deferredMoveto = 0;
  pC->cacheStatus = CACHE_STALE;
  if( pC->isTable ){
    u16 flags3, newType;
    /* The BTREE_SEEK_EQ flag is only set on index cursors */
    assert( sqlite3BtreeCursorHasHint(pC->uc.pCursor, BTREE_SEEK_EQ)==0
              || CORRUPT_DB );

    /* The input value in P3 might be of any type: integer, real, string,
    ** blob, or NULL.  But it needs to be an integer before we can do
    ** the seek, so convert it. */
    pIn3 = &aMem[pOp->p3];
................................................................................
    }
    rc = sqlite3BtreeMovetoUnpacked(pC->uc.pCursor, 0, (u64)iKey, 0, &res);
    pC->movetoTarget = iKey;  /* Used by OP_Delete */
    if( rc!=SQLITE_OK ){
      goto abort_due_to_error;
    }
  }else{
    /* For a cursor with the BTREE_SEEK_EQ hint, only the OP_SeekGE and
    ** OP_SeekLE opcodes are allowed, and these must be immediately followed
    ** by an OP_IdxGT or OP_IdxLT opcode, respectively, with the same key.

    */
    if( sqlite3BtreeCursorHasHint(pC->uc.pCursor, BTREE_SEEK_EQ) ){
      eqOnly = 1;
      assert( pOp->opcode==OP_SeekGE || pOp->opcode==OP_SeekLE );
      assert( pOp[1].opcode==OP_IdxLT || pOp[1].opcode==OP_IdxGT );


      assert( pOp[1].p1==pOp[0].p1 );
      assert( pOp[1].p2==pOp[0].p2 );
      assert( pOp[1].p3==pOp[0].p3 );
      assert( pOp[1].p4.i==pOp[0].p4.i );
    }

    nField = pOp->p4.i;
................................................................................
#endif

  n = sqlite3BtreePayloadSize(pCrsr);
  if( n>(u32)db->aLimit[SQLITE_LIMIT_LENGTH] ){
    goto too_big;
  }
  testcase( n==0 );
  rc = sqlite3VdbeMemFromBtree(pCrsr, 0, n, pOut);
  if( rc ) goto abort_due_to_error;
  if( !pOp->p3 ) Deephemeralize(pOut);
  UPDATE_MAX_BLOBSIZE(pOut);
  REGISTER_TRACE(pOp->p2, pOut);
  break;
}

................................................................................
** the OPFLAG_USESEEKRESULT flag must only be set if there have been no prior
** seeks on the cursor or if the most recent seek used a key equivalent
** to P2. 
**
** This instruction only works for indices.  The equivalent instruction
** for tables is OP_Insert.
*/
/* Opcode: SorterInsert P1 P2 * * *
** Synopsis: key=r[P2]
**
** Register P2 holds an SQL index key made using the
** MakeRecord instructions.  This opcode writes that key
** into the sorter P1.  Data for the entry is nil.
*/
case OP_SorterInsert:       /* in2 */
case OP_IdxInsert: {        /* in2 */
  VdbeCursor *pC;
  BtreePayload x;

  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  pC = p->apCsr[pOp->p1];
  sqlite3VdbeIncrWriteCounter(p, pC);
  assert( pC!=0 );
  assert( isSorter(pC)==(pOp->opcode==OP_SorterInsert) );
  pIn2 = &aMem[pOp->p2];
  assert( pIn2->flags & MEM_Blob );
  if( pOp->p5 & OPFLAG_NCHANGE ) p->nChange++;
  assert( pC->eCurType==CURTYPE_BTREE || pOp->opcode==OP_SorterInsert );
  assert( pC->isTable==0 );
  rc = ExpandBlob(pIn2);
  if( rc ) goto abort_due_to_error;
  if( pOp->opcode==OP_SorterInsert ){
    rc = sqlite3VdbeSorterWrite(pC, pIn2);
  }else{
    x.nKey = pIn2->n;
    x.pKey = pIn2->z;
    x.aMem = aMem + pOp->p3;
    x.nMem = (u16)pOp->p4.i;
    rc = sqlite3BtreeInsert(pC->uc.pCursor, &x,
         (pOp->p5 & (OPFLAG_APPEND|OPFLAG_SAVEPOSITION)), 
        ((pOp->p5 & OPFLAG_USESEEKRESULT) ? pC->seekResult : 0)
        );
    assert( pC->deferredMoveto==0 );
    pC->cacheStatus = CACHE_STALE;


  }






















  if( rc) goto abort_due_to_error;
  break;
}

/* Opcode: IdxDelete P1 P2 P3 * *
** Synopsis: key=r[P2@P3]
**
** The content of P3 registers starting at register P2 form
** an unpacked index key. This opcode removes that entry from the 
** index opened by cursor P1.







*/
case OP_IdxDelete: {
  VdbeCursor *pC;
  BtCursor *pCrsr;
  int res;
  UnpackedRecord r;

................................................................................
  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  pC = p->apCsr[pOp->p1];
  assert( pC!=0 );
  assert( pC->eCurType==CURTYPE_BTREE );
  sqlite3VdbeIncrWriteCounter(p, pC);
  pCrsr = pC->uc.pCursor;
  assert( pCrsr!=0 );
  assert( pOp->p5==0 );
  r.pKeyInfo = pC->pKeyInfo;
  r.nField = (u16)pOp->p3;
  r.default_rc = 0;
  r.aMem = &aMem[pOp->p2];
  rc = sqlite3BtreeMovetoUnpacked(pCrsr, &r, 0, 0, &res);
  if( rc ) goto abort_due_to_error;
  if( res==0 ){
    rc = sqlite3BtreeDelete(pCrsr, BTREE_AUXDELETE);
    if( rc ) goto abort_due_to_error;



  }
  assert( pC->deferredMoveto==0 );
  pC->cacheStatus = CACHE_STALE;
  pC->seekResult = 0;
  break;
}

................................................................................
#ifdef SQLITE_DEBUG
  /* Verify that second and subsequent executions of the same trigger do not
  ** try to reuse register values from the first use. */
  {
    int i;
    for(i=0; i<p->nMem; i++){
      aMem[i].pScopyFrom = 0;  /* Prevent false-positive AboutToChange() errs */
      aMem[i].flags |= MEM_Undefined; /* Cause a fault if this reg is reused */
    }
  }
#endif
  pOp = &aOp[-1];
  goto check_for_interrupt;
}

................................................................................
  }
  pOut->u.i = sqlite3BtreeMaxPageCount(pBt, newMax);
  break;
}
#endif

/* Opcode: Function P1 P2 P3 P4 *
** Synopsis: r[P3]=func(r[P2@P5])
**
** Invoke a user function (P4 is a pointer to an sqlite3_context object that
** contains a pointer to the function to be run) with arguments taken
** from register P2 and successors.  The number of arguments is in
** the sqlite3_context object that P4 points to.
** The result of the function is stored
** in register P3.  Register P3 must not be one of the function inputs.
................................................................................
** whether meta data associated with a user function argument using the
** sqlite3_set_auxdata() API may be safely retained until the next
** invocation of this opcode.
**
** See also: AggStep, AggFinal, PureFunc
*/
/* Opcode: PureFunc P1 P2 P3 P4 *
** Synopsis: r[P3]=func(r[P2@P5])
**
** Invoke a user function (P4 is a pointer to an sqlite3_context object that
** contains a pointer to the function to be run) with arguments taken
** from register P2 and successors.  The number of arguments is in
** the sqlite3_context object that P4 points to.
** The result of the function is stored
** in register P3.  Register P3 must not be one of the function inputs.
................................................................................
  rc = SQLITE_NOMEM_BKPT;
  goto abort_due_to_error;

  /* Jump to here if the sqlite3_interrupt() API sets the interrupt
  ** flag.
  */
abort_due_to_interrupt:
  assert( db->u1.isInterrupted );
  rc = db->mallocFailed ? SQLITE_NOMEM_BKPT : SQLITE_INTERRUPT;
  p->rc = rc;
  sqlite3VdbeError(p, "%s", sqlite3ErrStr(rc));
  goto abort_due_to_error;
}


................................................................................
  const u8 * const v1 = &p1[ p1[0] ];   /* Pointer to value 1 */
  const u8 * const v2 = &p2[ p2[0] ];   /* Pointer to value 2 */

  int n1;
  int n2;
  int res;

  getVarint32(&p1[1], n1);
  getVarint32(&p2[1], n2);
  res = memcmp(v1, v2, (MIN(n1, n2) - 13)/2);
  if( res==0 ){
    res = n1 - n2;
  }

  if( res==0 ){
    if( pTask->pSorter->pKeyInfo->nKeyField>1 ){
................................................................................
  int bFlush;                     /* True to flush contents of memory to PMA */
  int nReq;                       /* Bytes of memory required */
  int nPMA;                       /* Bytes of PMA space required */
  int t;                          /* serial type of first record field */

  assert( pCsr->eCurType==CURTYPE_SORTER );
  pSorter = pCsr->uc.pSorter;
  getVarint32((const u8*)&pVal->z[1], t);
  if( t>0 && t<10 && t!=7 ){
    pSorter->typeMask &= SORTER_TYPE_INTEGER;
  }else if( t>10 && (t & 0x01) ){
    pSorter->typeMask &= SORTER_TYPE_TEXT;
  }else{
    pSorter->typeMask = 0;
  }
................................................................................
  }

  *pRes = sqlite3VdbeRecordCompare(pVal->n, pVal->z, r2);
  return SQLITE_OK;
}

/************** End of vdbesort.c ********************************************/











































































































































































































































































































































































































































/************** Begin file memjournal.c **************************************/
/*
** 2008 October 7
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
................................................................................
*/
SQLITE_PRIVATE int sqlite3WalkSelectFrom(Walker *pWalker, Select *p){
  SrcList *pSrc;
  int i;
  struct SrcList_item *pItem;

  pSrc = p->pSrc;
  assert( pSrc!=0 );
  for(i=pSrc->nSrc, pItem=pSrc->a; i>0; i--, pItem++){
    if( pItem->pSelect && sqlite3WalkSelect(pWalker, pItem->pSelect) ){
      return WRC_Abort;
    }
    if( pItem->fg.isTabFunc
     && sqlite3WalkExprList(pWalker, pItem->u1.pFuncArg)
    ){
      return WRC_Abort;

    }
  }
  return WRC_Continue;
} 

/*
** Call sqlite3WalkExpr() for every expression in Select statement p.
................................................................................
  const struct ExprList_item *pItem,
  const char *zCol,
  const char *zTab,
  const char *zDb
){
  int n;
  const char *zSpan;
  if( NEVER(pItem->eEName!=ENAME_TAB) ) return 0;
  zSpan = pItem->zEName;
  for(n=0; ALWAYS(zSpan[n]) && zSpan[n]!='.'; n++){}
  if( zDb && (sqlite3StrNICmp(zSpan, zDb, n)!=0 || zDb[n]!=0) ){
    return 0;
  }
  zSpan += n+1;
  for(n=0; ALWAYS(zSpan[n]) && zSpan[n]!='.'; n++){}
................................................................................
    }
    return (db->flags & SQLITE_DqsDDL)!=0;
  }else{
    /* Currently parsing a DML statement */
    return (db->flags & SQLITE_DqsDML)!=0;
  }
}


























/*
** Given the name of a column of the form X.Y.Z or Y.Z or just Z, look up
** that name in the set of source tables in pSrcList and make the pExpr 
** expression node refer back to that source column.  The following changes
** are made to pExpr:
**
................................................................................
      for(i=0; i<db->nDb; i++){
        assert( db->aDb[i].zDbSName );
        if( sqlite3StrICmp(db->aDb[i].zDbSName,zDb)==0 ){
          pSchema = db->aDb[i].pSchema;
          break;
        }
      }






    }
  }

  /* Start at the inner-most context and move outward until a match is found */
  assert( pNC && cnt==0 );
  do{
    ExprList *pEList;
    SrcList *pSrcList = pNC->pSrcList;

    if( pSrcList ){
      for(i=0, pItem=pSrcList->a; i<pSrcList->nSrc; i++, pItem++){

        pTab = pItem->pTab;
        assert( pTab!=0 && pTab->zName!=0 );
        assert( pTab->nCol>0 );
        if( pItem->pSelect && (pItem->pSelect->selFlags & SF_NestedFrom)!=0 ){
          int hit = 0;
          pEList = pItem->pSelect->pEList;
          for(j=0; j<pEList->nExpr; j++){
................................................................................
          if( IN_RENAME_OBJECT && pItem->zAlias ){
            sqlite3RenameTokenRemap(pParse, 0, (void*)&pExpr->y.pTab);
          }
        }
        if( 0==(cntTab++) ){
          pMatch = pItem;
        }

        for(j=0, pCol=pTab->aCol; j<pTab->nCol; j++, pCol++){
          if( sqlite3StrICmp(pCol->zName, zCol)==0 ){
            /* If there has been exactly one prior match and this match
            ** is for the right-hand table of a NATURAL JOIN or is in a 
            ** USING clause, then skip this match.
            */
            if( cnt==1 ){
              if( pItem->fg.jointype & JT_NATURAL ) continue;
              if( nameInUsingClause(pItem->pUsing, zCol) ) continue;
................................................................................
          pExpr->iTable = 2;
        }
      }
#endif /* SQLITE_OMIT_UPSERT */

      if( pTab ){ 
        int iCol;

        pSchema = pTab->pSchema;
        cntTab++;
        for(iCol=0, pCol=pTab->aCol; iCol<pTab->nCol; iCol++, pCol++){
          if( sqlite3StrICmp(pCol->zName, zCol)==0 ){
            if( iCol==pTab->iPKey ){
              iCol = -1;
            }
            break;
          }
        }
        if( iCol>=pTab->nCol && sqlite3IsRowid(zCol) && VisibleRowid(pTab) ){
................................................................................
  ** avoid setting bits beyond the maximum column number of the table.
  ** (See ticket [b92e5e8ec2cdbaa1]).
  **
  ** If a generated column is referenced, set bits for every column
  ** of the table.
  */
  if( pExpr->iColumn>=0 && pMatch!=0 ){
    int n = pExpr->iColumn;
    Table *pExTab = pExpr->y.pTab;
    assert( pExTab!=0 );
    assert( pMatch->iCursor==pExpr->iTable );
    if( (pExTab->tabFlags & TF_HasGenerated)!=0
     && (pExTab->aCol[n].colFlags & COLFLAG_GENERATED)!=0 
    ){
      testcase( pExTab->nCol==BMS-1 );
      testcase( pExTab->nCol==BMS );
      pMatch->colUsed = pExTab->nCol>=BMS ? ALLBITS : MASKBIT(pExTab->nCol)-1;
    }else{
      testcase( n==BMS-1 );
      testcase( n==BMS );
      if( n>=BMS ) n = BMS-1;
      pMatch->colUsed |= ((Bitmask)1)<<n;
    }
  }

  /* Clean up and return
  */
  sqlite3ExprDelete(db, pExpr->pLeft);
  pExpr->pLeft = 0;
  sqlite3ExprDelete(db, pExpr->pRight);
................................................................................
          /* For the purposes of the EP_ConstFunc flag, date and time
          ** functions and other functions that change slowly are considered
          ** constant because they are constant for the duration of one query.
          ** This allows them to be factored out of inner loops. */
          ExprSetProperty(pExpr,EP_ConstFunc);
        }
        if( (pDef->funcFlags & SQLITE_FUNC_CONSTANT)==0 ){

          /* Date/time functions that use 'now', and other functions like
          ** sqlite_version() that might change over time cannot be used
          ** in an index. */



          sqlite3ResolveNotValid(pParse, pNC, "non-deterministic functions",
                                 NC_SelfRef, 0);

        }else{
          assert( (NC_SelfRef & 0xff)==NC_SelfRef ); /* Must fit in 8 bits */
          pExpr->op2 = pNC->ncFlags & NC_SelfRef;
          if( pNC->ncFlags & NC_FromDDL ) ExprSetProperty(pExpr, EP_FromDDL);
        }
        if( (pDef->funcFlags & SQLITE_FUNC_INTERNAL)!=0
         && pParse->nested==0
................................................................................
    }
    case TK_IS:
    case TK_ISNOT: {
      Expr *pRight = sqlite3ExprSkipCollateAndLikely(pExpr->pRight);
      assert( !ExprHasProperty(pExpr, EP_Reduced) );
      /* Handle special cases of "x IS TRUE", "x IS FALSE", "x IS NOT TRUE",
      ** and "x IS NOT FALSE". */
      if( pRight->op==TK_ID ){
        int rc = resolveExprStep(pWalker, pRight);
        if( rc==WRC_Abort ) return WRC_Abort;
        if( pRight->op==TK_TRUEFALSE ){
          pExpr->op2 = pExpr->op;
          pExpr->op = TK_TRUTH;
          return WRC_Continue;
        }
................................................................................
  nc.pParse = pParse;
  nc.pSrcList = pSelect->pSrc;
  nc.uNC.pEList = pEList;
  nc.ncFlags = NC_AllowAgg|NC_UEList;
  nc.nErr = 0;
  db = pParse->db;
  savedSuppErr = db->suppressErr;
  db->suppressErr = 1;
  rc = sqlite3ResolveExprNames(&nc, pE);
  db->suppressErr = savedSuppErr;
  if( rc ) return 0;

  /* Try to match the ORDER BY expression against an expression
  ** in the result set.  Return an 1-based index of the matching
  ** result-set entry.
................................................................................
** list rather than a single expression.
*/
SQLITE_PRIVATE int sqlite3ResolveExprListNames( 
  NameContext *pNC,       /* Namespace to resolve expressions in. */
  ExprList *pList         /* The expression list to be analyzed. */
){
  int i;


  if( pList ){







    for(i=0; i<pList->nExpr; i++){





      if( sqlite3ResolveExprNames(pNC, pList->a[i].pExpr) ) return WRC_Abort;
    }













  }



  return WRC_Continue;
}

/*
** Resolve all names in all expressions of a SELECT and in all
** decendents of the SELECT, including compounds off of p->pPrior,
** subqueries in expressions, and subqueries used as FROM clause
................................................................................
** have an affinity:
**
** CREATE TABLE t1(a);
** SELECT * FROM t1 WHERE a;
** SELECT a AS b FROM t1 WHERE b;
** SELECT * FROM t1 WHERE (select a from t1);
*/
SQLITE_PRIVATE char sqlite3ExprAffinity(Expr *pExpr){
  int op;
  while( ExprHasProperty(pExpr, EP_Skip) ){
    assert( pExpr->op==TK_COLLATE );
    pExpr = pExpr->pLeft;
    assert( pExpr!=0 );
  }
  op = pExpr->op;
  if( op==TK_SELECT ){
    assert( pExpr->flags&EP_xIsSelect );
    return sqlite3ExprAffinity(pExpr->x.pSelect->pEList->a[0].pExpr);
................................................................................
}

/*
** Skip over any TK_COLLATE operators.
*/
SQLITE_PRIVATE Expr *sqlite3ExprSkipCollate(Expr *pExpr){
  while( pExpr && ExprHasProperty(pExpr, EP_Skip) ){
    assert( pExpr->op==TK_COLLATE );
    pExpr = pExpr->pLeft;
  }   
  return pExpr;
}

/*
** Skip over any TK_COLLATE operators and/or any unlikely()
................................................................................
  while( pExpr && ExprHasProperty(pExpr, EP_Skip|EP_Unlikely) ){
    if( ExprHasProperty(pExpr, EP_Unlikely) ){
      assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
      assert( pExpr->x.pList->nExpr>0 );
      assert( pExpr->op==TK_FUNCTION );
      pExpr = pExpr->x.pList->a[0].pExpr;
    }else{
      assert( pExpr->op==TK_COLLATE );
      pExpr = pExpr->pLeft;
    }
  }   
  return pExpr;
}

/*
................................................................................
** default collation if pExpr has no defined collation.
**
** The collating sequence might be determined by a COLLATE operator
** or by the presence of a column with a defined collating sequence.
** COLLATE operators take first precedence.  Left operands take
** precedence over right operands.
*/
SQLITE_PRIVATE CollSeq *sqlite3ExprCollSeq(Parse *pParse, Expr *pExpr){
  sqlite3 *db = pParse->db;
  CollSeq *pColl = 0;
  Expr *p = pExpr;
  while( p ){
    int op = p->op;
    if( op==TK_REGISTER ) op = p->op2;
    if( (op==TK_AGG_COLUMN || op==TK_COLUMN || op==TK_TRIGGER)
     && p->y.pTab!=0
    ){
      /* op==TK_REGISTER && p->y.pTab!=0 happens when pExpr was originally
................................................................................
** defautl collation sequence.
**
** See also: sqlite3ExprCollSeq()
**
** The sqlite3ExprCollSeq() routine works the same except that it
** returns NULL if there is no defined collation.
*/
SQLITE_PRIVATE CollSeq *sqlite3ExprNNCollSeq(Parse *pParse, Expr *pExpr){
  CollSeq *p = sqlite3ExprCollSeq(pParse, pExpr);
  if( p==0 ) p = pParse->db->pDfltColl;
  assert( p!=0 );
  return p;
}

/*
** Return TRUE if the two expressions have equivalent collating sequences.
*/
SQLITE_PRIVATE int sqlite3ExprCollSeqMatch(Parse *pParse, Expr *pE1, Expr *pE2){
  CollSeq *pColl1 = sqlite3ExprNNCollSeq(pParse, pE1);
  CollSeq *pColl2 = sqlite3ExprNNCollSeq(pParse, pE2);
  return sqlite3StrICmp(pColl1->zName, pColl2->zName)==0;
}

/*
** pExpr is an operand of a comparison operator.  aff2 is the
** type affinity of the other operand.  This routine returns the
** type affinity that should be used for the comparison operator.
*/
SQLITE_PRIVATE char sqlite3CompareAffinity(Expr *pExpr, char aff2){
  char aff1 = sqlite3ExprAffinity(pExpr);
  if( aff1>SQLITE_AFF_NONE && aff2>SQLITE_AFF_NONE ){
    /* Both sides of the comparison are columns. If one has numeric
    ** affinity, use that. Otherwise use no affinity.
    */
    if( sqlite3IsNumericAffinity(aff1) || sqlite3IsNumericAffinity(aff2) ){
      return SQLITE_AFF_NUMERIC;
................................................................................
  }
}

/*
** pExpr is a comparison operator.  Return the type affinity that should
** be applied to both operands prior to doing the comparison.
*/
static char comparisonAffinity(Expr *pExpr){
  char aff;
  assert( pExpr->op==TK_EQ || pExpr->op==TK_IN || pExpr->op==TK_LT ||
          pExpr->op==TK_GT || pExpr->op==TK_GE || pExpr->op==TK_LE ||
          pExpr->op==TK_NE || pExpr->op==TK_IS || pExpr->op==TK_ISNOT );
  assert( pExpr->pLeft );
  aff = sqlite3ExprAffinity(pExpr->pLeft);
  if( pExpr->pRight ){
................................................................................

/*
** pExpr is a comparison expression, eg. '=', '<', IN(...) etc.
** idx_affinity is the affinity of an indexed column. Return true
** if the index with affinity idx_affinity may be used to implement
** the comparison in pExpr.
*/
SQLITE_PRIVATE int sqlite3IndexAffinityOk(Expr *pExpr, char idx_affinity){
  char aff = comparisonAffinity(pExpr);
  if( aff<SQLITE_AFF_TEXT ){
    return 1;
  }
  if( aff==SQLITE_AFF_TEXT ){
    return idx_affinity==SQLITE_AFF_TEXT;
  }
................................................................................
  return sqlite3IsNumericAffinity(idx_affinity);
}

/*
** Return the P5 value that should be used for a binary comparison
** opcode (OP_Eq, OP_Ge etc.) used to compare pExpr1 and pExpr2.
*/
static u8 binaryCompareP5(Expr *pExpr1, Expr *pExpr2, int jumpIfNull){




  u8 aff = (char)sqlite3ExprAffinity(pExpr2);
  aff = (u8)sqlite3CompareAffinity(pExpr1, aff) | (u8)jumpIfNull;
  return aff;
}

/*
** Return a pointer to the collation sequence that should be used by
................................................................................
** type.
**
** Argument pRight (but not pLeft) may be a null pointer. In this case,
** it is not considered.
*/
SQLITE_PRIVATE CollSeq *sqlite3BinaryCompareCollSeq(
  Parse *pParse, 
  Expr *pLeft, 
  Expr *pRight
){
  CollSeq *pColl;
  assert( pLeft );
  if( pLeft->flags & EP_Collate ){
    pColl = sqlite3ExprCollSeq(pParse, pLeft);
  }else if( pRight && (pRight->flags & EP_Collate)!=0 ){
    pColl = sqlite3ExprCollSeq(pParse, pRight);
................................................................................
** appropriate for the comparison operator.
**
** This is normally just a wrapper around sqlite3BinaryCompareCollSeq().
** However, if the OP_Commuted flag is set, then the order of the operands
** is reversed in the sqlite3BinaryCompareCollSeq() call so that the
** correct collating sequence is found.
*/
SQLITE_PRIVATE CollSeq *sqlite3ExprCompareCollSeq(Parse *pParse, Expr *p){
  if( ExprHasProperty(p, EP_Commuted) ){
    return sqlite3BinaryCompareCollSeq(pParse, p->pRight, p->pLeft);
  }else{
    return sqlite3BinaryCompareCollSeq(pParse, p->pLeft, p->pRight);
  }
}

................................................................................
  int i;
  int regLeft = 0;
  int regRight = 0;
  u8 opx = op;
  int addrDone = sqlite3VdbeMakeLabel(pParse);
  int isCommuted = ExprHasProperty(pExpr,EP_Commuted);


  if( pParse->nErr ) return;
  if( nLeft!=sqlite3ExprVectorSize(pRight) ){
    sqlite3ErrorMsg(pParse, "row value misused");
    return;
  }
  assert( pExpr->op==TK_EQ || pExpr->op==TK_NE 
       || pExpr->op==TK_IS || pExpr->op==TK_ISNOT 
................................................................................
#endif
  ){
    nSize = EXPR_FULLSIZE;
  }else{
    assert( !ExprHasProperty(p, EP_TokenOnly|EP_Reduced) );
    assert( !ExprHasProperty(p, EP_FromJoin) ); 
    assert( !ExprHasProperty(p, EP_MemToken) );
    assert( !ExprHasProperty(p, EP_NoReduce) );
    if( p->pLeft || p->x.pList ){
      nSize = EXPR_REDUCEDSIZE | EP_Reduced;
    }else{
      assert( p->pRight==0 );
      nSize = EXPR_TOKENONLYSIZE | EP_TokenOnly;
    }
  }
................................................................................
      }
    }

    /* Set the EP_Reduced, EP_TokenOnly, and EP_Static flags appropriately. */
    pNew->flags &= ~(EP_Reduced|EP_TokenOnly|EP_Static|EP_MemToken);
    pNew->flags |= nStructSize & (EP_Reduced|EP_TokenOnly);
    pNew->flags |= staticFlag;





    /* Copy the p->u.zToken string, if any. */
    if( nToken ){
      char *zToken = pNew->u.zToken = (char*)&zAlloc[nNewSize];
      memcpy(zToken, p->u.zToken, nToken);
    }

................................................................................
SQLITE_PRIVATE void sqlite3ExprListSetName(
  Parse *pParse,          /* Parsing context */
  ExprList *pList,        /* List to which to add the span. */
  Token *pName,           /* Name to be added */
  int dequote             /* True to cause the name to be dequoted */
){
  assert( pList!=0 || pParse->db->mallocFailed!=0 );

  if( pList ){
    struct ExprList_item *pItem;
    assert( pList->nExpr>0 );
    pItem = &pList->a[pList->nExpr-1];
    assert( pItem->zEName==0 );
    assert( pItem->eEName==ENAME_NAME );
    pItem->zEName = sqlite3DbStrNDup(pParse->db, pName->z, pName->n);




    if( dequote ) sqlite3Dequote(pItem->zEName);
    if( IN_RENAME_OBJECT ){
      sqlite3RenameTokenMap(pParse, (void*)pItem->zEName, pName);

    }
  }
}

/*
** Set the ExprList.a[].zSpan element of the most recently added item
** on the expression list.
................................................................................
**   (2) the expression does originate in the ON or USING clause
**       of a LEFT JOIN, and
**   (3) the expression does not contain any EP_FixedCol TK_COLUMN
**       operands created by the constant propagation optimization.
**
** When this routine returns true, it indicates that the expression
** can be added to the pParse->pConstExpr list and evaluated once when
** the prepared statement starts up.  See sqlite3ExprCodeAtInit().
*/
SQLITE_PRIVATE int sqlite3ExprIsConstantNotJoin(Expr *p){
  return exprIsConst(p, 2, 0);
}

/*
** Walk an expression tree.  Return non-zero if the expression is constant
................................................................................
      sqlite3VdbeAddOp2(v, OP_OpenDup, iTab, pExpr->iTable);
      sqlite3VdbeJumpHere(v, addrOnce);
      return;
    }

    /* Begin coding the subroutine */
    ExprSetProperty(pExpr, EP_Subrtn);

    pExpr->y.sub.regReturn = ++pParse->nMem;
    pExpr->y.sub.iAddr =
      sqlite3VdbeAddOp2(v, OP_Integer, 0, pExpr->y.sub.regReturn) + 1;
    VdbeComment((v, "return address"));

    addrOnce = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
  }
................................................................................
    int i;
    ExprList *pList = pExpr->x.pList;
    struct ExprList_item *pItem;
    int r1, r2;
    affinity = sqlite3ExprAffinity(pLeft);
    if( affinity<=SQLITE_AFF_NONE ){
      affinity = SQLITE_AFF_BLOB;


    }
    if( pKeyInfo ){
      assert( sqlite3KeyInfoIsWriteable(pKeyInfo) );
      pKeyInfo->aColl[0] = sqlite3ExprCollSeq(pParse, pExpr->pLeft);
    }

    /* Loop through each expression in <exprlist>. */
................................................................................
  int i;                /* loop counter */
  int destStep2;        /* Where to jump when NULLs seen in step 2 */
  int destStep6 = 0;    /* Start of code for Step 6 */
  int addrTruthOp;      /* Address of opcode that determines the IN is true */
  int destNotNull;      /* Jump here if a comparison is not true in step 6 */
  int addrTop;          /* Top of the step-6 loop */ 
  int iTab = 0;         /* Index to use */



  pLeft = pExpr->pLeft;
  if( sqlite3ExprCheckIN(pParse, pExpr) ) return;
  zAff = exprINAffinity(pParse, pExpr);
  nVector = sqlite3ExprVectorSize(pExpr->pLeft);
  aiMap = (int*)sqlite3DbMallocZero(
      pParse->db, nVector*(sizeof(int) + sizeof(char)) + 1
  );
................................................................................
  ** vector, then it is stored in an array of nVector registers starting 
  ** at r1.
  **
  ** sqlite3FindInIndex() might have reordered the fields of the LHS vector
  ** so that the fields are in the same order as an existing index.   The
  ** aiMap[] array contains a mapping from the original LHS field order to
  ** the field order that matches the RHS index.
  */





  rLhsOrig = exprCodeVector(pParse, pLeft, &iDummy);

  for(i=0; i<nVector && aiMap[i]==i; i++){} /* Are LHS fields reordered? */
  if( i==nVector ){
    /* LHS fields are not reordered */
    rLhs = rLhsOrig;
  }else{
    /* Need to reorder the LHS fields according to aiMap */
    rLhs = sqlite3GetTempRange(pParse, nVector);
................................................................................
  if( eType==IN_INDEX_NOOP ){
    ExprList *pList = pExpr->x.pList;
    CollSeq *pColl = sqlite3ExprCollSeq(pParse, pExpr->pLeft);
    int labelOk = sqlite3VdbeMakeLabel(pParse);
    int r2, regToFree;
    int regCkNull = 0;
    int ii;
    int bLhsReal;  /* True if the LHS of the IN has REAL affinity */
    assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
    if( destIfNull!=destIfFalse ){
      regCkNull = sqlite3GetTempReg(pParse);
      sqlite3VdbeAddOp3(v, OP_BitAnd, rLhs, rLhs, regCkNull);
    }
    bLhsReal = sqlite3ExprAffinity(pExpr->pLeft)==SQLITE_AFF_REAL;
    for(ii=0; ii<pList->nExpr; ii++){
      if( bLhsReal ){
        r2 = regToFree = sqlite3GetTempReg(pParse);
        sqlite3ExprCode(pParse, pList->a[ii].pExpr, r2);
        sqlite3VdbeAddOp4(v, OP_Affinity, r2, 1, 0, "E", P4_STATIC);
      }else{
        r2 = sqlite3ExprCodeTemp(pParse, pList->a[ii].pExpr, &regToFree);
      }
      if( regCkNull && sqlite3ExprCanBeNull(pList->a[ii].pExpr) ){
        sqlite3VdbeAddOp3(v, OP_BitAnd, regCkNull, r2, regCkNull);
      }
      sqlite3ReleaseTempReg(pParse, regToFree);
      if( ii<pList->nExpr-1 || destIfNull!=destIfFalse ){
        int op = rLhs!=r2 ? OP_Eq : OP_NotNull;
        sqlite3VdbeAddOp4(v, op, rLhs, labelOk, r2,
................................................................................
  assert( v!=0 );
  assert( pParse->iSelfTab!=0 );
  if( pParse->iSelfTab>0 ){
    iAddr = sqlite3VdbeAddOp3(v, OP_IfNullRow, pParse->iSelfTab-1, 0, regOut);
  }else{
    iAddr = 0;
  }
  sqlite3ExprCode(pParse, pCol->pDflt, regOut);
  if( pCol->affinity>=SQLITE_AFF_TEXT ){
    sqlite3VdbeAddOp4(v, OP_Affinity, regOut, 1, 0, &pCol->affinity, 1);
  }
  if( iAddr ) sqlite3VdbeJumpHere(v, iAddr);
}
#endif /* SQLITE_OMIT_GENERATED_COLUMNS */

................................................................................
      for(i=0; i<nResult; i++){
        sqlite3ExprCodeFactorable(pParse, p->x.pList->a[i].pExpr, i+iResult);
      }
    }
  }
  return iResult;
}











/*
** Generate code to implement special SQL functions that are implemented
** in-line rather than by using the usual callbacks.
*/
static int exprCodeInlineFunction(
  Parse *pParse,        /* Parsing context */
................................................................................
      assert( nFarg>=2 );
      sqlite3ExprCode(pParse, pFarg->a[0].pExpr, target);
      for(i=1; i<nFarg; i++){
        sqlite3VdbeAddOp2(v, OP_NotNull, target, endCoalesce);
        VdbeCoverage(v);
        sqlite3ExprCode(pParse, pFarg->a[i].pExpr, target);
      }
      if( sqlite3VdbeGetOp(v, -1)->opcode==OP_Copy ){
        sqlite3VdbeChangeP5(v, 1);  /* Tag trailing OP_Copy as not mergable */
      }
      sqlite3VdbeResolveLabel(v, endCoalesce);
      break;
    }








    default: {   
      /* The UNLIKELY() function is a no-op.  The result is the value
      ** of the first argument.
      */
      assert( nFarg==1 || nFarg==2 );
      target = sqlite3ExprCodeTarget(pParse, pFarg->a[0].pExpr, target);
................................................................................
    return 0;
  }

expr_code_doover:
  if( pExpr==0 ){
    op = TK_NULL;
  }else{

    op = pExpr->op;
  }
  switch( op ){
    case TK_AGG_COLUMN: {
      AggInfo *pAggInfo = pExpr->pAggInfo;
      struct AggInfo_col *pCol = &pAggInfo->aCol[pExpr->iAgg];
      if( !pAggInfo->directMode ){
        assert( pCol->iMem>0 );
        return pCol->iMem;
      }else if( pAggInfo->useSortingIdx ){

        sqlite3VdbeAddOp3(v, OP_Column, pAggInfo->sortingIdxPTab,
                              pCol->iSorterColumn, target);








        return target;
      }
      /* Otherwise, fall thru into the TK_COLUMN case */
    }
    case TK_COLUMN: {
      int iTab = pExpr->iTable;
      int iReg;
................................................................................
        }else{
          aff = pExpr->affExpr;
        }
        if( aff>SQLITE_AFF_BLOB ){
          static const char zAff[] = "B\000C\000D\000E";
          assert( SQLITE_AFF_BLOB=='A' );
          assert( SQLITE_AFF_TEXT=='B' );
          if( iReg!=target ){
            sqlite3VdbeAddOp2(v, OP_SCopy, iReg, target);
            iReg = target;
          }
          sqlite3VdbeAddOp4(v, OP_Affinity, iReg, 1, 0,
                            &zAff[(aff-'B')*2], P4_STATIC);
        }
        return iReg;
      }
      if( iTab<0 ){
        if( pParse->iSelfTab<0 ){
................................................................................
        codeReal(v, pLeft->u.zToken, 1, target);
        return target;
#endif
      }else{
        tempX.op = TK_INTEGER;
        tempX.flags = EP_IntValue|EP_TokenOnly;
        tempX.u.iValue = 0;

        r1 = sqlite3ExprCodeTemp(pParse, &tempX, &regFree1);
        r2 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree2);
        sqlite3VdbeAddOp3(v, OP_Subtract, r2, r1, target);
        testcase( regFree2==0 );
      }
      break;
    }
................................................................................
#ifndef SQLITE_OMIT_WINDOWFUNC
      if( ExprHasProperty(pExpr, EP_WinFunc) ){
        return pExpr->y.pWin->regResult;
      }
#endif

      if( ConstFactorOk(pParse) && sqlite3ExprIsConstantNotJoin(pExpr) ){
        /* SQL functions can be expensive. So try to move constant functions
        ** out of the inner loop, even if that means an extra OP_Copy. */
        return sqlite3ExprCodeAtInit(pParse, pExpr, -1);
      }
      assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
      if( ExprHasProperty(pExpr, EP_TokenOnly) ){
        pFarg = 0;
      }else{
        pFarg = pExpr->x.pList;
      }
      nFarg = pFarg ? pFarg->nExpr : 0;
      assert( !ExprHasProperty(pExpr, EP_IntValue) );
      zId = pExpr->u.zToken;
      pDef = sqlite3FindFunction(db, zId, nFarg, enc, 0);
#ifdef SQLITE_ENABLE_UNKNOWN_SQL_FUNCTION
      if( pDef==0 && pParse->explain ){
        pDef = sqlite3FindFunction(db, "unknown", nFarg, enc, 0);
................................................................................
      }
      if( (nExpr&1)!=0 ){
        sqlite3ExprCode(pParse, pEList->a[nExpr-1].pExpr, target);
      }else{
        sqlite3VdbeAddOp2(v, OP_Null, 0, target);
      }
      sqlite3ExprDelete(db, pDel);

      sqlite3VdbeResolveLabel(v, endLabel);
      break;
    }
#ifndef SQLITE_OMIT_TRIGGER
    case TK_RAISE: {
      assert( pExpr->affExpr==OE_Rollback 
           || pExpr->affExpr==OE_Abort
           || pExpr->affExpr==OE_Fail
           || pExpr->affExpr==OE_Ignore
      );
      if( !pParse->pTriggerTab ){
        sqlite3ErrorMsg(pParse,
                       "RAISE() may only be used within a trigger-program");
        return 0;
      }
      if( pExpr->affExpr==OE_Abort ){
        sqlite3MayAbort(pParse);
      }
      assert( !ExprHasProperty(pExpr, EP_IntValue) );
      if( pExpr->affExpr==OE_Ignore ){
        sqlite3VdbeAddOp4(
            v, OP_Halt, SQLITE_OK, OE_Ignore, 0, pExpr->u.zToken,0);
        VdbeCoverage(v);
      }else{
        sqlite3HaltConstraint(pParse, SQLITE_CONSTRAINT_TRIGGER,

                              pExpr->affExpr, pExpr->u.zToken, 0, 0);
      }

      break;
    }
#endif
  }
  sqlite3ReleaseTempReg(pParse, regFree1);
  sqlite3ReleaseTempReg(pParse, regFree2);
  return inReg;
}

/*
** Factor out the code of the given expression to initialization time.






**
** If regDest>=0 then the result is always stored in that register and the
** result is not reusable.  If regDest<0 then this routine is free to 
** store the value whereever it wants.  The register where the expression 
** is stored is returned.  When regDest<0, two identical expressions will
** code to the same register.


*/
SQLITE_PRIVATE int sqlite3ExprCodeAtInit(
  Parse *pParse,    /* Parsing context */
  Expr *pExpr,      /* The expression to code when the VDBE initializes */
  int regDest       /* Store the value in this register */
){
  ExprList *p;
  assert( ConstFactorOk(pParse) );
  p = pParse->pConstExpr;
................................................................................
    for(pItem=p->a, i=p->nExpr; i>0; pItem++, i--){
      if( pItem->reusable && sqlite3ExprCompare(0,pItem->pExpr,pExpr,-1)==0 ){
        return pItem->u.iConstExprReg;
      }
    }
  }
  pExpr = sqlite3ExprDup(pParse->db, pExpr, 0);














  p = sqlite3ExprListAppend(pParse, p, pExpr);
  if( p ){
     struct ExprList_item *pItem = &p->a[p->nExpr-1];
     pItem->reusable = regDest<0;
     if( regDest<0 ) regDest = ++pParse->nMem;
     pItem->u.iConstExprReg = regDest;
  }
  pParse->pConstExpr = p;

  return regDest;
}

/*
** Generate code to evaluate an expression and store the results
** into a register.  Return the register number where the results
** are stored.
................................................................................
  int r2;
  pExpr = sqlite3ExprSkipCollateAndLikely(pExpr);
  if( ConstFactorOk(pParse)
   && pExpr->op!=TK_REGISTER
   && sqlite3ExprIsConstantNotJoin(pExpr)
  ){
    *pReg  = 0;
    r2 = sqlite3ExprCodeAtInit(pParse, pExpr, -1);
  }else{
    int r1 = sqlite3GetTempReg(pParse);
    r2 = sqlite3ExprCodeTarget(pParse, pExpr, r1);
    if( r2==r1 ){
      *pReg = r1;
    }else{
      sqlite3ReleaseTempReg(pParse, r1);
................................................................................
** Generate code that will evaluate expression pExpr and store the
** results in register target.  The results are guaranteed to appear
** in register target.
*/
SQLITE_PRIVATE void sqlite3ExprCode(Parse *pParse, Expr *pExpr, int target){
  int inReg;


  assert( target>0 && target<=pParse->nMem );
  inReg = sqlite3ExprCodeTarget(pParse, pExpr, target);
  assert( pParse->pVdbe!=0 || pParse->db->mallocFailed );
  if( inReg!=target && pParse->pVdbe ){
    u8 op;
    if( ExprHasProperty(pExpr,EP_Subquery) ){
      op = OP_Copy;
................................................................................
** Generate code that will evaluate expression pExpr and store the
** results in register target.  The results are guaranteed to appear
** in register target.  If the expression is constant, then this routine
** might choose to code the expression at initialization time.
*/
SQLITE_PRIVATE void sqlite3ExprCodeFactorable(Parse *pParse, Expr *pExpr, int target){
  if( pParse->okConstFactor && sqlite3ExprIsConstantNotJoin(pExpr) ){
    sqlite3ExprCodeAtInit(pParse, pExpr, target);
  }else{
    sqlite3ExprCode(pParse, pExpr, target);
  }
}

/*
** Generate code that pushes the value of every element of the given
** expression list into a sequence of registers beginning at target.
**
................................................................................
        n--;
      }else{
        sqlite3VdbeAddOp2(v, copyOp, j+srcReg-1, target+i);
      }
    }else if( (flags & SQLITE_ECEL_FACTOR)!=0
           && sqlite3ExprIsConstantNotJoin(pExpr)
    ){
      sqlite3ExprCodeAtInit(pParse, pExpr, target+i);
    }else{
      int inReg = sqlite3ExprCodeTarget(pParse, pExpr, target+i);
      if( inReg!=target+i ){
        VdbeOp *pOp;
        if( copyOp==OP_Copy
         && (pOp=sqlite3VdbeGetOp(v, -1))->opcode==OP_Copy
         && pOp->p1+pOp->p3+1==inReg
................................................................................
  int regFree1 = 0;
  int regFree2 = 0;
  int r1, r2;

  assert( jumpIfNull==SQLITE_JUMPIFNULL || jumpIfNull==0 );
  if( NEVER(v==0) )     return;  /* Existence of VDBE checked by caller */
  if( NEVER(pExpr==0) ) return;  /* No way this can happen */

  op = pExpr->op;
  switch( op ){
    case TK_AND:
    case TK_OR: {
      Expr *pAlt = sqlite3ExprSimplifiedAndOr(pExpr);
      if( pAlt!=pExpr ){
        sqlite3ExprIfTrue(pParse, pAlt, dest, jumpIfNull);
................................................................................
  int regFree1 = 0;
  int regFree2 = 0;
  int r1, r2;

  assert( jumpIfNull==SQLITE_JUMPIFNULL || jumpIfNull==0 );
  if( NEVER(v==0) ) return; /* Existence of VDBE checked by caller */
  if( pExpr==0 )    return;


  /* The value of pExpr->op and op are related as follows:
  **
  **       pExpr->op            op
  **       ---------          ----------
  **       TK_ISNULL          OP_NotNull
  **       TK_NOTNULL         OP_IsNull
................................................................................
      if( sqlite3_stricmp(pA->u.zToken,pB->u.zToken)!=0 ) return 2;
    }else if( ALWAYS(pB->u.zToken!=0) && strcmp(pA->u.zToken,pB->u.zToken)!=0 ){
      return 2;
    }
  }
  if( (pA->flags & (EP_Distinct|EP_Commuted))
     != (pB->flags & (EP_Distinct|EP_Commuted)) ) return 2;
  if( (combinedFlags & EP_TokenOnly)==0 ){
    if( combinedFlags & EP_xIsSelect ) return 2;
    if( (combinedFlags & EP_FixedCol)==0
     && sqlite3ExprCompare(pParse, pA->pLeft, pB->pLeft, iTab) ) return 2;
    if( sqlite3ExprCompare(pParse, pA->pRight, pB->pRight, iTab) ) return 2;
    if( sqlite3ExprListCompare(pA->x.pList, pB->x.pList, iTab) ) return 2;
    if( pA->op!=TK_STRING
     && pA->op!=TK_TRUEFALSE
     && (combinedFlags & EP_Reduced)==0
    ){
      if( pA->iColumn!=pB->iColumn ) return 2;
      if( pA->op2!=pB->op2 ){
        if( pA->op==TK_TRUTH ) return 2;
        if( pA->op==TK_FUNCTION && iTab<0 ){
          /* Ex: CREATE TABLE t1(a CHECK( a<julianday('now') ));
          **     INSERT INTO t1(a) VALUES(julianday('now')+10);
          ** Without this test, sqlite3ExprCodeAtInit() will run on the
          ** the julianday() of INSERT first, and remember that expression.
          ** Then sqlite3ExprCodeInit() will see the julianday() in the CHECK
          ** constraint as redundant, reusing the one from the INSERT, even
          ** though the julianday() in INSERT lacks the critical NC_IsCheck
          ** flag.  See ticket [830277d9db6c3ba1] (2019-10-30)
          */
          return 2;
        }
      }
      if( pA->op!=TK_IN && pA->iTable!=pB->iTable && pA->iTable!=iTab ){
        return 2;
      }
    }
  }
  return 0;
}
................................................................................
    ** a term of the form x=y does not prove that y is not null if x
    ** is the column of a virtual table */
    case TK_EQ:
    case TK_NE:
    case TK_LT:
    case TK_LE:
    case TK_GT:
    case TK_GE:


      testcase( pExpr->op==TK_EQ );
      testcase( pExpr->op==TK_NE );
      testcase( pExpr->op==TK_LT );
      testcase( pExpr->op==TK_LE );
      testcase( pExpr->op==TK_GT );
      testcase( pExpr->op==TK_GE );


      if( (pExpr->pLeft->op==TK_COLUMN && IsVirtual(pExpr->pLeft->y.pTab))

       || (pExpr->pRight->op==TK_COLUMN && IsVirtual(pExpr->pRight->y.pTab))

      ){
       return WRC_Prune;
      }

    default:
      return WRC_Continue;
  }
}

/*
** Return true (non-zero) if expression p can only be true if at least
................................................................................
  /* Get a NULL terminated version of the new table name. */
  zName = sqlite3NameFromToken(db, pName);
  if( !zName ) goto exit_rename_table;

  /* Check that a table or index named 'zName' does not already exist
  ** in database iDb. If so, this is an error.
  */
  if( sqlite3FindTable(db, zName, zDb) || sqlite3FindIndex(db, zName, zDb) ){



    sqlite3ErrorMsg(pParse, 
        "there is already another table or index with this name: %s", zName);
    goto exit_rename_table;
  }

  /* Make sure it is not a system table being altered, or a reserved name
  ** that the table is being renamed to.
................................................................................
  renameTestSchema(pParse, zDb, iDb==1);

exit_rename_table:
  sqlite3SrcListDelete(db, pSrc);
  sqlite3DbFree(db, zName);
  db->mDbFlags = savedDbFlags;
}

















/*
** This function is called after an "ALTER TABLE ... ADD" statement
** has been parsed. Argument pColDef contains the text of the new
** column definition.
**
** The Table structure pParse->pNewTable was extended to include
................................................................................
  ** column must not be NULL.
  */
  if( pCol->colFlags & COLFLAG_PRIMKEY ){
    sqlite3ErrorMsg(pParse, "Cannot add a PRIMARY KEY column");
    return;
  }
  if( pNew->pIndex ){

    sqlite3ErrorMsg(pParse, "Cannot add a UNIQUE column");
    return;
  }
  if( (pCol->colFlags & COLFLAG_GENERATED)==0 ){
    /* If the default value for the new column was specified with a 
    ** literal NULL, then set pDflt to 0. This simplifies checking
    ** for an SQL NULL default below.
    */
    assert( pDflt==0 || pDflt->op==TK_SPAN );
    if( pDflt && pDflt->pLeft->op==TK_NULL ){
      pDflt = 0;
    }
    if( (db->flags&SQLITE_ForeignKeys) && pNew->pFKey && pDflt ){
      sqlite3ErrorMsg(pParse, 
          "Cannot add a REFERENCES column with non-NULL default value");
      return;
    }
    if( pCol->notNull && !pDflt ){
      sqlite3ErrorMsg(pParse, 
          "Cannot add a NOT NULL column with default value NULL");
      return;
    }


    /* Ensure the default expression is something that sqlite3ValueFromExpr()
    ** can handle (i.e. not CURRENT_TIME etc.)
    */
    if( pDflt ){
      sqlite3_value *pVal = 0;
      int rc;
................................................................................
      rc = sqlite3ValueFromExpr(db, pDflt, SQLITE_UTF8, SQLITE_AFF_BLOB, &pVal);
      assert( rc==SQLITE_OK || rc==SQLITE_NOMEM );
      if( rc!=SQLITE_OK ){
        assert( db->mallocFailed == 1 );
        return;
      }
      if( !pVal ){
        sqlite3ErrorMsg(pParse,"Cannot add a column with non-constant default");
        return;
      }
      sqlite3ValueFree(pVal);
    }
  }else if( pCol->colFlags & COLFLAG_STORED ){
    sqlite3ErrorMsg(pParse, "cannot add a STORED column");
    return;
  }


  /* Modify the CREATE TABLE statement. */
  zCol = sqlite3DbStrNDup(db, (char*)pColDef->z, pColDef->n);
  if( zCol ){
    char *zEnd = &zCol[pColDef->n-1];
................................................................................
    assert( db->mallocFailed );
    goto exit_begin_add_column;
  }
  memcpy(pNew->aCol, pTab->aCol, sizeof(Column)*pNew->nCol);
  for(i=0; i<pNew->nCol; i++){
    Column *pCol = &pNew->aCol[i];
    pCol->zName = sqlite3DbStrDup(db, pCol->zName);

    pCol->zColl = 0;
    pCol->pDflt = 0;
  }
  pNew->pSchema = db->aDb[iDb].pSchema;
  pNew->addColOffset = pTab->addColOffset;
  pNew->nTabRef = 1;

................................................................................
** with tail recursion in tokenExpr() routine, for a small performance
** improvement.
*/
SQLITE_PRIVATE void *sqlite3RenameTokenMap(Parse *pParse, void *pPtr, Token *pToken){
  RenameToken *pNew;
  assert( pPtr || pParse->db->mallocFailed );
  renameTokenCheckAll(pParse, pPtr);
  if( pParse->eParseMode!=PARSE_MODE_UNMAP ){
    pNew = sqlite3DbMallocZero(pParse->db, sizeof(RenameToken));
    if( pNew ){
      pNew->p = pPtr;
      pNew->t = *pToken;
      pNew->pNext = pParse->pRename;
      pParse->pRename = pNew;
    }
................................................................................
      sNC.pParse = pWalker->pParse;
      sqlite3SelectPrep(sNC.pParse, p, &sNC);
      sqlite3WalkSelect(pWalker, p);
      sqlite3RenameExprlistUnmap(pWalker->pParse, pWith->a[i].pCols);
    }
  }
}
















/*
** Walker callback used by sqlite3RenameExprUnmap().
*/
static int renameUnmapSelectCb(Walker *pWalker, Select *p){
  Parse *pParse = pWalker->pParse;
  int i;
................................................................................
    }
  }
  if( ALWAYS(p->pSrc) ){  /* Every Select as a SrcList, even if it is empty */
    SrcList *pSrc = p->pSrc;
    for(i=0; i<pSrc->nSrc; i++){
      sqlite3RenameTokenRemap(pParse, 0, (void*)pSrc->a[i].zName);
      if( sqlite3WalkExpr(pWalker, pSrc->a[i].pOn) ) return WRC_Abort;

    }
  }

  renameWalkWith(pWalker, p);
  return WRC_Continue;
}

................................................................................
      char *zName = pIdList->a[i].zName;
      if( 0==sqlite3_stricmp(zName, zOld) ){
        renameTokenFind(pParse, pCtx, (void*)zName);
      }
    }
  }
}


/*
** Parse the SQL statement zSql using Parse object (*p). The Parse object
** is initialized by this function before it is used.
*/
static int renameParseSql(
  Parse *p,                       /* Memory to use for Parse object */
................................................................................
  };
  int i;
  sqlite3 *db = pParse->db;
  Db *pDb;
  Vdbe *v = sqlite3GetVdbe(pParse);
  int aRoot[ArraySize(aTable)];
  u8 aCreateTbl[ArraySize(aTable)];






  if( v==0 ) return;
  assert( sqlite3BtreeHoldsAllMutexes(db) );
  assert( sqlite3VdbeDb(v)==db );
  pDb = &db->aDb[iDb];

  /* Create new statistic tables if they do not exist, or clear them
  ** if they do already exist.
  */
  for(i=0; i<ArraySize(aTable); i++){
    const char *zTab = aTable[i].zName;
    Table *pStat;

    if( (pStat = sqlite3FindTable(db, zTab, pDb->zDbSName))==0 ){
      if( aTable[i].zCols ){

        /* The sqlite_statN table does not exist. Create it. Note that a 
        ** side-effect of the CREATE TABLE statement is to leave the rootpage 
        ** of the new table in register pParse->regRoot. This is important 
        ** because the OpenWrite opcode below will be needing it. */
        sqlite3NestedParse(pParse,
            "CREATE TABLE %Q.%s(%s)", pDb->zDbSName, zTab, aTable[i].zCols
        );
................................................................................
        aCreateTbl[i] = OPFLAG_P2ISREG;
      }
    }else{
      /* The table already exists. If zWhere is not NULL, delete all entries 
      ** associated with the table zWhere. If zWhere is NULL, delete the
      ** entire contents of the table. */
      aRoot[i] = pStat->tnum;
      aCreateTbl[i] = 0;
      sqlite3TableLock(pParse, iDb, aRoot[i], 1, zTab);
      if( zWhere ){
        sqlite3NestedParse(pParse,
           "DELETE FROM %Q.%s WHERE %s=%Q",
           pDb->zDbSName, zTab, zWhereType, zWhere
        );
#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
................................................................................
        /* The sqlite_stat[134] table already exists.  Delete all rows. */
        sqlite3VdbeAddOp2(v, OP_Clear, aRoot[i], iDb);
      }
    }
  }

  /* Open the sqlite_stat[134] tables for writing. */
  for(i=0; aTable[i].zCols; i++){
    assert( i<ArraySize(aTable) );
    sqlite3VdbeAddOp4Int(v, OP_OpenWrite, iStatCur+i, aRoot[i], iDb, 3);
    sqlite3VdbeChangeP5(v, aCreateTbl[i]);
    VdbeComment((v, aTable[i].zName));
  }
}

................................................................................
#endif

/*
** Three SQL functions - stat_init(), stat_push(), and stat_get() -
** share an instance of the following structure to hold their state
** information.
*/
typedef struct Stat4Accum Stat4Accum;
typedef struct Stat4Sample Stat4Sample;
struct Stat4Sample {
  tRowcnt *anEq;                  /* sqlite_stat4.nEq */
  tRowcnt *anDLt;                 /* sqlite_stat4.nDLt */
#ifdef SQLITE_ENABLE_STAT4
  tRowcnt *anLt;                  /* sqlite_stat4.nLt */
  union {
    i64 iRowid;                     /* Rowid in main table of the key */
    u8 *aRowid;                     /* Key for WITHOUT ROWID tables */
................................................................................
  } u;
  u32 nRowid;                     /* Sizeof aRowid[] */
  u8 isPSample;                   /* True if a periodic sample */
  int iCol;                       /* If !isPSample, the reason for inclusion */
  u32 iHash;                      /* Tiebreaker hash */
#endif
};                                                    
struct Stat4Accum {


  tRowcnt nRow;             /* Number of rows in the entire table */
  tRowcnt nPSample;         /* How often to do a periodic sample */

  int nCol;                 /* Number of columns in index + pk/rowid */
  int nKeyCol;              /* Number of index columns w/o the pk/rowid */




  int mxSample;             /* Maximum number of samples to accumulate */
  Stat4Sample current;      /* Current row as a Stat4Sample */
  u32 iPrn;                 /* Pseudo-random number used for sampling */
  Stat4Sample *aBest;       /* Array of nCol best samples */
  int iMin;                 /* Index in a[] of entry with minimum score */
  int nSample;              /* Current number of samples */
  int nMaxEqZero;           /* Max leading 0 in anEq[] for any a[] entry */
  int iGet;                 /* Index of current sample accessed by stat_get() */
  Stat4Sample *a;           /* Array of mxSample Stat4Sample objects */
  sqlite3 *db;              /* Database connection, for malloc() */
};

/* Reclaim memory used by a Stat4Sample
*/
#ifdef SQLITE_ENABLE_STAT4
static void sampleClear(sqlite3 *db, Stat4Sample *p){
  assert( db!=0 );
  if( p->nRowid ){
    sqlite3DbFree(db, p->u.aRowid);
    p->nRowid = 0;
  }
}
#endif

/* Initialize the BLOB value of a ROWID
*/
#ifdef SQLITE_ENABLE_STAT4
static void sampleSetRowid(sqlite3 *db, Stat4Sample *p, int n, const u8 *pData){
  assert( db!=0 );
  if( p->nRowid ) sqlite3DbFree(db, p->u.aRowid);
  p->u.aRowid = sqlite3DbMallocRawNN(db, n);
  if( p->u.aRowid ){
    p->nRowid = n;
    memcpy(p->u.aRowid, pData, n);
  }else{
................................................................................
  }
}
#endif

/* Initialize the INTEGER value of a ROWID.
*/
#ifdef SQLITE_ENABLE_STAT4
static void sampleSetRowidInt64(sqlite3 *db, Stat4Sample *p, i64 iRowid){
  assert( db!=0 );
  if( p->nRowid ) sqlite3DbFree(db, p->u.aRowid);
  p->nRowid = 0;
  p->u.iRowid = iRowid;
}
#endif


/*
** Copy the contents of object (*pFrom) into (*pTo).
*/
#ifdef SQLITE_ENABLE_STAT4
static void sampleCopy(Stat4Accum *p, Stat4Sample *pTo, Stat4Sample *pFrom){
  pTo->isPSample = pFrom->isPSample;
  pTo->iCol = pFrom->iCol;
  pTo->iHash = pFrom->iHash;
  memcpy(pTo->anEq, pFrom->anEq, sizeof(tRowcnt)*p->nCol);
  memcpy(pTo->anLt, pFrom->anLt, sizeof(tRowcnt)*p->nCol);
  memcpy(pTo->anDLt, pFrom->anDLt, sizeof(tRowcnt)*p->nCol);
  if( pFrom->nRowid ){
................................................................................
  }else{
    sampleSetRowidInt64(p->db, pTo, pFrom->u.iRowid);
  }
}
#endif

/*
** Reclaim all memory of a Stat4Accum structure.
*/
static void stat4Destructor(void *pOld){
  Stat4Accum *p = (Stat4Accum*)pOld;
#ifdef SQLITE_ENABLE_STAT4

  int i;
  for(i=0; i<p->nCol; i++) sampleClear(p->db, p->aBest+i);
  for(i=0; i<p->mxSample; i++) sampleClear(p->db, p->a+i);
  sampleClear(p->db, &p->current);

#endif
  sqlite3DbFree(p->db, p);
}

/*
** Implementation of the stat_init(N,K,C) SQL function. The three parameters
** are:
**     N:    The number of columns in the index including the rowid/pk (note 1)
**     K:    The number of columns in the index excluding the rowid/pk.
**     C:    The number of rows in the index (note 2)

**
** Note 1:  In the special case of the covering index that implements a
** WITHOUT ROWID table, N is the number of PRIMARY KEY columns, not the
** total number of columns in the table.
**
** Note 2:  C is only used for STAT4.
**
** For indexes on ordinary rowid tables, N==K+1.  But for indexes on
** WITHOUT ROWID tables, N=K+P where P is the number of columns in the
** PRIMARY KEY of the table.  The covering index that implements the
** original WITHOUT ROWID table as N==K as a special case.
**
** This routine allocates the Stat4Accum object in heap memory. The return 
** value is a pointer to the Stat4Accum object.  The datatype of the
** return value is BLOB, but it is really just a pointer to the Stat4Accum
** object.
*/
static void statInit(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  Stat4Accum *p;
  int nCol;                       /* Number of columns in index being sampled */
  int nKeyCol;                    /* Number of key columns */
  int nColUp;                     /* nCol rounded up for alignment */
  int n;                          /* Bytes of space to allocate */
  sqlite3 *db;                    /* Database connection */
#ifdef SQLITE_ENABLE_STAT4
  int mxSample = SQLITE_STAT4_SAMPLES;

#endif

  /* Decode the three function arguments */
  UNUSED_PARAMETER(argc);
  nCol = sqlite3_value_int(argv[0]);
  assert( nCol>0 );
  nColUp = sizeof(tRowcnt)<8 ? (nCol+1)&~1 : nCol;
  nKeyCol = sqlite3_value_int(argv[1]);
  assert( nKeyCol<=nCol );
  assert( nKeyCol>0 );

  /* Allocate the space required for the Stat4Accum object */
  n = sizeof(*p) 
    + sizeof(tRowcnt)*nColUp                  /* Stat4Accum.anEq */
    + sizeof(tRowcnt)*nColUp                  /* Stat4Accum.anDLt */
#ifdef SQLITE_ENABLE_STAT4

    + sizeof(tRowcnt)*nColUp                  /* Stat4Accum.anLt */
    + sizeof(Stat4Sample)*(nCol+mxSample)     /* Stat4Accum.aBest[], a[] */
    + sizeof(tRowcnt)*3*nColUp*(nCol+mxSample)

#endif
  ;
  db = sqlite3_context_db_handle(context);
  p = sqlite3DbMallocZero(db, n);
  if( p==0 ){
    sqlite3_result_error_nomem(context);
    return;
  }

  p->db = db;

  p->nRow = 0;

  p->nCol = nCol;
  p->nKeyCol = nKeyCol;

  p->current.anDLt = (tRowcnt*)&p[1];
  p->current.anEq = &p->current.anDLt[nColUp];

#ifdef SQLITE_ENABLE_STAT4
  {

    u8 *pSpace;                     /* Allocated space not yet assigned */
    int i;                          /* Used to iterate through p->aSample[] */

    p->iGet = -1;
    p->mxSample = mxSample;
    p->nPSample = (tRowcnt)(sqlite3_value_int64(argv[2])/(mxSample/3+1) + 1);
    p->current.anLt = &p->current.anEq[nColUp];
    p->iPrn = 0x689e962d*(u32)nCol ^ 0xd0944565*(u32)sqlite3_value_int(argv[2]);
  
    /* Set up the Stat4Accum.a[] and aBest[] arrays */
    p->a = (struct Stat4Sample*)&p->current.anLt[nColUp];
    p->aBest = &p->a[mxSample];
    pSpace = (u8*)(&p->a[mxSample+nCol]);
    for(i=0; i<(mxSample+nCol); i++){
      p->a[i].anEq = (tRowcnt *)pSpace; pSpace += (sizeof(tRowcnt) * nColUp);
      p->a[i].anLt = (tRowcnt *)pSpace; pSpace += (sizeof(tRowcnt) * nColUp);
      p->a[i].anDLt = (tRowcnt *)pSpace; pSpace += (sizeof(tRowcnt) * nColUp);
    }
................................................................................
  }
#endif

  /* Return a pointer to the allocated object to the caller.  Note that
  ** only the pointer (the 2nd parameter) matters.  The size of the object
  ** (given by the 3rd parameter) is never used and can be any positive
  ** value. */
  sqlite3_result_blob(context, p, sizeof(*p), stat4Destructor);
}
static const FuncDef statInitFuncdef = {
  2+IsStat4,       /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statInit,        /* xSFunc */
  0,               /* xFinalize */
  0, 0,            /* xValue, xInverse */
  "stat_init",     /* zName */
................................................................................
** In other words, if we assume that the cardinalities of the selected
** column for pNew and pOld are equal, is pNew to be preferred over pOld.
**
** This function assumes that for each argument sample, the contents of
** the anEq[] array from pSample->anEq[pSample->iCol+1] onwards are valid. 
*/
static int sampleIsBetterPost(
  Stat4Accum *pAccum, 
  Stat4Sample *pNew, 
  Stat4Sample *pOld
){
  int nCol = pAccum->nCol;
  int i;
  assert( pNew->iCol==pOld->iCol );
  for(i=pNew->iCol+1; i<nCol; i++){
    if( pNew->anEq[i]>pOld->anEq[i] ) return 1;
    if( pNew->anEq[i]<pOld->anEq[i] ) return 0;
................................................................................
/*
** Return true if pNew is to be preferred over pOld.
**
** This function assumes that for each argument sample, the contents of
** the anEq[] array from pSample->anEq[pSample->iCol] onwards are valid. 
*/
static int sampleIsBetter(
  Stat4Accum *pAccum, 
  Stat4Sample *pNew, 
  Stat4Sample *pOld
){
  tRowcnt nEqNew = pNew->anEq[pNew->iCol];
  tRowcnt nEqOld = pOld->anEq[pOld->iCol];

  assert( pOld->isPSample==0 && pNew->isPSample==0 );
  assert( IsStat4 || (pNew->iCol==0 && pOld->iCol==0) );

................................................................................
  return 0;
}

/*
** Copy the contents of sample *pNew into the p->a[] array. If necessary,
** remove the least desirable sample from p->a[] to make room.
*/
static void sampleInsert(Stat4Accum *p, Stat4Sample *pNew, int nEqZero){
  Stat4Sample *pSample = 0;
  int i;

  assert( IsStat4 || nEqZero==0 );

  /* Stat4Accum.nMaxEqZero is set to the maximum number of leading 0
  ** values in the anEq[] array of any sample in Stat4Accum.a[]. In
  ** other words, if nMaxEqZero is n, then it is guaranteed that there
  ** are no samples with Stat4Sample.anEq[m]==0 for (m>=n). */
  if( nEqZero>p->nMaxEqZero ){
    p->nMaxEqZero = nEqZero;
  }
  if( pNew->isPSample==0 ){
    Stat4Sample *pUpgrade = 0;
    assert( pNew->anEq[pNew->iCol]>0 );

    /* This sample is being added because the prefix that ends in column 
    ** iCol occurs many times in the table. However, if we have already
    ** added a sample that shares this prefix, there is no need to add
    ** this one. Instead, upgrade the priority of the highest priority
    ** existing sample that shares this prefix.  */
    for(i=p->nSample-1; i>=0; i--){
      Stat4Sample *pOld = &p->a[i];
      if( pOld->anEq[pNew->iCol]==0 ){
        if( pOld->isPSample ) return;
        assert( pOld->iCol>pNew->iCol );
        assert( sampleIsBetter(p, pNew, pOld) );
        if( pUpgrade==0 || sampleIsBetter(p, pOld, pUpgrade) ){
          pUpgrade = pOld;
        }
................................................................................
      pUpgrade->anEq[pUpgrade->iCol] = pNew->anEq[pUpgrade->iCol];
      goto find_new_min;
    }
  }

  /* If necessary, remove sample iMin to make room for the new sample. */
  if( p->nSample>=p->mxSample ){
    Stat4Sample *pMin = &p->a[p->iMin];
    tRowcnt *anEq = pMin->anEq;
    tRowcnt *anLt = pMin->anLt;
    tRowcnt *anDLt = pMin->anDLt;
    sampleClear(p->db, pMin);
    memmove(pMin, &pMin[1], sizeof(p->a[0])*(p->nSample-p->iMin-1));
    pSample = &p->a[p->nSample-1];
    pSample->nRowid = 0;
................................................................................
    }
    assert( iMin>=0 );
    p->iMin = iMin;
  }
}
#endif /* SQLITE_ENABLE_STAT4 */


/*
** Field iChng of the index being scanned has changed. So at this point
** p->current contains a sample that reflects the previous row of the
** index. The value of anEq[iChng] and subsequent anEq[] elements are
** correct at this point.
*/
static void samplePushPrevious(Stat4Accum *p, int iChng){
#ifdef SQLITE_ENABLE_STAT4
  int i;

  /* Check if any samples from the aBest[] array should be pushed
  ** into IndexSample.a[] at this point.  */
  for(i=(p->nCol-2); i>=iChng; i--){
    Stat4Sample *pBest = &p->aBest[i];
    pBest->anEq[i] = p->current.anEq[i];
    if( p->nSample<p->mxSample || sampleIsBetter(p, pBest, &p->a[p->iMin]) ){
      sampleInsert(p, pBest, i);
    }
  }

  /* Check that no sample contains an anEq[] entry with an index of
................................................................................
      int j;
      for(j=iChng; j<p->nCol; j++){
        if( p->a[i].anEq[j]==0 ) p->a[i].anEq[j] = p->current.anEq[j];
      }
    }
    p->nMaxEqZero = iChng;
  }
#endif

#ifndef SQLITE_ENABLE_STAT4
  UNUSED_PARAMETER( p );
  UNUSED_PARAMETER( iChng );
#endif
}

/*
** Implementation of the stat_push SQL function:  stat_push(P,C,R)
** Arguments:
**
**    P     Pointer to the Stat4Accum object created by stat_init()
**    C     Index of left-most column to differ from previous row
**    R     Rowid for the current row.  Might be a key record for
**          WITHOUT ROWID tables.
**
** This SQL function always returns NULL.  It's purpose it to accumulate
** statistical data and/or samples in the Stat4Accum object about the
** index being analyzed.  The stat_get() SQL function will later be used to
** extract relevant information for constructing the sqlite_statN tables.



**
** The R parameter is only used for STAT4
*/
static void statPush(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  int i;

  /* The three function arguments */
  Stat4Accum *p = (Stat4Accum*)sqlite3_value_blob(argv[0]);
  int iChng = sqlite3_value_int(argv[1]);

  UNUSED_PARAMETER( argc );
  UNUSED_PARAMETER( context );
  assert( p->nCol>0 );
  assert( iChng<p->nCol );

  if( p->nRow==0 ){
    /* This is the first call to this function. Do initialization. */
    for(i=0; i<p->nCol; i++) p->current.anEq[i] = 1;
  }else{
    /* Second and subsequent calls get processed here */

    samplePushPrevious(p, iChng);


    /* Update anDLt[], anLt[] and anEq[] to reflect the values that apply
    ** to the current row of the index. */
    for(i=0; i<iChng; i++){
      p->current.anEq[i]++;
    }
    for(i=iChng; i<p->nCol; i++){
      p->current.anDLt[i]++;
#ifdef SQLITE_ENABLE_STAT4
      p->current.anLt[i] += p->current.anEq[i];
#endif
      p->current.anEq[i] = 1;
    }
  }

  p->nRow++;
#ifdef SQLITE_ENABLE_STAT4


  if( sqlite3_value_type(argv[2])==SQLITE_INTEGER ){
    sampleSetRowidInt64(p->db, &p->current, sqlite3_value_int64(argv[2]));
  }else{
    sampleSetRowid(p->db, &p->current, sqlite3_value_bytes(argv[2]),
                                       sqlite3_value_blob(argv[2]));
  }
  p->current.iHash = p->iPrn = p->iPrn*1103515245 + 12345;
#endif

#ifdef SQLITE_ENABLE_STAT4
  {
    tRowcnt nLt = p->current.anLt[p->nCol-1];

    /* Check if this is to be a periodic sample. If so, add it. */
    if( (nLt/p->nPSample)!=(nLt+1)/p->nPSample ){
      p->current.isPSample = 1;
      p->current.iCol = 0;
      sampleInsert(p, &p->current, p->nCol-1);
      p->current.isPSample = 0;
    }
................................................................................
    /* Update the aBest[] array. */
    for(i=0; i<(p->nCol-1); i++){
      p->current.iCol = i;
      if( i>=iChng || sampleIsBetterPost(p, &p->current, &p->aBest[i]) ){
        sampleCopy(p, &p->aBest[i], &p->current);
      }
    }
  }
#endif



}


static const FuncDef statPushFuncdef = {
  2+IsStat4,       /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statPush,        /* xSFunc */
  0,               /* xFinalize */
................................................................................
#define STAT_GET_NEQ   2          /* "neq" column of stat[34] entry */
#define STAT_GET_NLT   3          /* "nlt" column of stat[34] entry */
#define STAT_GET_NDLT  4          /* "ndlt" column of stat[34] entry */

/*
** Implementation of the stat_get(P,J) SQL function.  This routine is
** used to query statistical information that has been gathered into
** the Stat4Accum object by prior calls to stat_push().  The P parameter
** has type BLOB but it is really just a pointer to the Stat4Accum object.
** The content to returned is determined by the parameter J
** which is one of the STAT_GET_xxxx values defined above.
**
** The stat_get(P,J) function is not available to generic SQL.  It is
** inserted as part of a manually constructed bytecode program.  (See
** the callStatGet() routine below.)  It is guaranteed that the P
** parameter will always be a poiner to a Stat4Accum object, never a
** NULL.
**
** If STAT4 is not enabled, then J is always
** STAT_GET_STAT1 and is hence omitted and this routine becomes
** a one-parameter function, stat_get(P), that always returns the
** stat1 table entry information.
*/
static void statGet(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  Stat4Accum *p = (Stat4Accum*)sqlite3_value_blob(argv[0]);
#ifdef SQLITE_ENABLE_STAT4
  /* STAT4 has a parameter on this routine. */
  int eCall = sqlite3_value_int(argv[1]);
  assert( argc==2 );
  assert( eCall==STAT_GET_STAT1 || eCall==STAT_GET_NEQ 
       || eCall==STAT_GET_ROWID || eCall==STAT_GET_NLT
       || eCall==STAT_GET_NDLT 
  );

  if( eCall==STAT_GET_STAT1 )
#else
  assert( argc==1 );
#endif
  {
    /* Return the value to store in the "stat" column of the sqlite_stat1
    ** table for this index.
    **
    ** The value is a string composed of a list of integers describing 
    ** the index. The first integer in the list is the total number of 
    ** entries in the index. There is one additional integer in the list 
    ** for each indexed column. This additional integer is an estimate of
    ** the number of rows matched by a stabbing query on the index using
    ** a key with the corresponding number of fields. In other words,
    ** if the index is on columns (a,b) and the sqlite_stat1 value is 
    ** "100 10 2", then SQLite estimates that:
    **
    **   * the index contains 100 rows,
    **   * "WHERE a=?" matches 10 rows, and
    **   * "WHERE a=? AND b=?" matches 2 rows.
................................................................................

    char *zRet = sqlite3MallocZero( (p->nKeyCol+1)*25 );
    if( zRet==0 ){
      sqlite3_result_error_nomem(context);
      return;
    }

    sqlite3_snprintf(24, zRet, "%llu", (u64)p->nRow);

    z = zRet + sqlite3Strlen30(zRet);
    for(i=0; i<p->nKeyCol; i++){
      u64 nDistinct = p->current.anDLt[i] + 1;
      u64 iVal = (p->nRow + nDistinct - 1) / nDistinct;
      sqlite3_snprintf(24, z, " %llu", iVal);
      z += sqlite3Strlen30(z);
      assert( p->current.anEq[i] );
................................................................................
#ifdef SQLITE_ENABLE_STAT4
  else if( eCall==STAT_GET_ROWID ){
    if( p->iGet<0 ){
      samplePushPrevious(p, 0);
      p->iGet = 0;
    }
    if( p->iGet<p->nSample ){
      Stat4Sample *pS = p->a + p->iGet;
      if( pS->nRowid==0 ){
        sqlite3_result_int64(context, pS->u.iRowid);
      }else{
        sqlite3_result_blob(context, pS->u.aRowid, pS->nRowid,
                            SQLITE_TRANSIENT);
      }
    }
................................................................................
  statGet,         /* xSFunc */
  0,               /* xFinalize */
  0, 0,            /* xValue, xInverse */
  "stat_get",      /* zName */
  {0}
};

static void callStatGet(Parse *pParse, int regStat4, int iParam, int regOut){
#ifdef SQLITE_ENABLE_STAT4
  sqlite3VdbeAddOp2(pParse->pVdbe, OP_Integer, iParam, regStat4+1);
#elif SQLITE_DEBUG
  assert( iParam==STAT_GET_STAT1 );
#else
  UNUSED_PARAMETER( iParam );
#endif
  assert( regOut!=regStat4 && regOut!=regStat4+1 );
  sqlite3VdbeAddFunctionCall(pParse, 0, regStat4, regOut, 1+IsStat4,
                             &statGetFuncdef, 0);
}

/*
** Generate code to do an analysis of all indices associated with
** a single table.
*/
................................................................................
  int iTabCur;                 /* Table cursor */
  Vdbe *v;                     /* The virtual machine being built up */
  int i;                       /* Loop counter */
  int jZeroRows = -1;          /* Jump from here if number of rows is zero */
  int iDb;                     /* Index of database containing pTab */
  u8 needTableCnt = 1;         /* True to count the table */
  int regNewRowid = iMem++;    /* Rowid for the inserted record */
  int regStat4 = iMem++;       /* Register to hold Stat4Accum object */
  int regChng = iMem++;        /* Index of changed index field */
#ifdef SQLITE_ENABLE_STAT4
  int regRowid = iMem++;       /* Rowid argument passed to stat_push() */
#endif
  int regTemp = iMem++;        /* Temporary use register */

  int regTabname = iMem++;     /* Register containing table name */
  int regIdxname = iMem++;     /* Register containing index name */
  int regStat1 = iMem++;       /* Value for the stat column of sqlite_stat1 */
  int regPrev = iMem;          /* MUST BE LAST (see below) */
#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
  Table *pStat1 = 0; 
#endif
................................................................................
    VdbeComment((v, "%s", pIdx->zName));

    /* Invoke the stat_init() function. The arguments are:
    ** 
    **    (1) the number of columns in the index including the rowid
    **        (or for a WITHOUT ROWID table, the number of PK columns),
    **    (2) the number of columns in the key without the rowid/pk
    **    (3) the number of rows in the index,
    **
    **
    ** The third argument is only used for STAT4
    */



#ifdef SQLITE_ENABLE_STAT4

    sqlite3VdbeAddOp2(v, OP_Count, iIdxCur, regStat4+3);



#endif






    sqlite3VdbeAddOp2(v, OP_Integer, nCol, regStat4+1);
    sqlite3VdbeAddOp2(v, OP_Integer, pIdx->nKeyCol, regStat4+2);
    sqlite3VdbeAddFunctionCall(pParse, 0, regStat4+1, regStat4, 2+IsStat4,
                               &statInitFuncdef, 0);

    /* Implementation of the following:
    **
    **   Rewind csr
    **   if eof(csr) goto end_of_scan;
    **   regChng = 0
    **   goto next_push_0;
    **
    */
    addrRewind = sqlite3VdbeAddOp1(v, OP_Rewind, iIdxCur);
    VdbeCoverage(v);
    sqlite3VdbeAddOp2(v, OP_Integer, 0, regChng);
    addrNextRow = sqlite3VdbeCurrentAddr(v);

    if( nColTest>0 ){
      int endDistinctTest = sqlite3VdbeMakeLabel(pParse);
      int *aGotoChng;               /* Array of jump instruction addresses */
      aGotoChng = sqlite3DbMallocRawNN(db, sizeof(int)*nColTest);
................................................................................
        sqlite3VdbeAddOp2(v, OP_NotNull, regPrev, endDistinctTest);
        VdbeCoverage(v);
      }
      for(i=0; i<nColTest; i++){
        char *pColl = (char*)sqlite3LocateCollSeq(pParse, pIdx->azColl[i]);
        sqlite3VdbeAddOp2(v, OP_Integer, i, regChng);
        sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, i, regTemp);

        aGotoChng[i] = 
        sqlite3VdbeAddOp4(v, OP_Ne, regTemp, 0, regPrev+i, pColl, P4_COLLSEQ);
        sqlite3VdbeChangeP5(v, SQLITE_NULLEQ);
        VdbeCoverage(v);
      }
      sqlite3VdbeAddOp2(v, OP_Integer, nColTest, regChng);
      sqlite3VdbeGoto(v, endDistinctTest);
................................................................................
      **   regPrev(1) = idx(1)
      **  ...
      */
      sqlite3VdbeJumpHere(v, addrNextRow-1);
      for(i=0; i<nColTest; i++){
        sqlite3VdbeJumpHere(v, aGotoChng[i]);
        sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, i, regPrev+i);

      }
      sqlite3VdbeResolveLabel(v, endDistinctTest);
      sqlite3DbFree(db, aGotoChng);
    }
  
    /*
    **  chng_addr_N:
    **   regRowid = idx(rowid)            // STAT4 only
    **   stat_push(P, regChng, regRowid)  // 3rd parameter STAT4 only
    **   Next csr
    **   if !eof(csr) goto next_row;
    */
#ifdef SQLITE_ENABLE_STAT4

    assert( regRowid==(regStat4+2) );
    if( HasRowid(pTab) ){
      sqlite3VdbeAddOp2(v, OP_IdxRowid, iIdxCur, regRowid);
    }else{
      Index *pPk = sqlite3PrimaryKeyIndex(pIdx->pTable);
      int j, k, regKey;
      regKey = sqlite3GetTempRange(pParse, pPk->nKeyCol);
      for(j=0; j<pPk->nKeyCol; j++){
        k = sqlite3TableColumnToIndex(pIdx, pPk->aiColumn[j]);
        assert( k>=0 && k<pIdx->nColumn );
        sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, k, regKey+j);
        VdbeComment((v, "%s", pTab->aCol[pPk->aiColumn[j]].zName));

      }
      sqlite3VdbeAddOp3(v, OP_MakeRecord, regKey, pPk->nKeyCol, regRowid);
      sqlite3ReleaseTempRange(pParse, regKey, pPk->nKeyCol);
    }

#endif
    assert( regChng==(regStat4+1) );

    sqlite3VdbeAddFunctionCall(pParse, 1, regStat4, regTemp, 2+IsStat4,
                               &statPushFuncdef, 0);







    sqlite3VdbeAddOp2(v, OP_Next, iIdxCur, addrNextRow); VdbeCoverage(v);







    /* Add the entry to the stat1 table. */
    callStatGet(pParse, regStat4, STAT_GET_STAT1, regStat1);
    assert( "BBB"[0]==SQLITE_AFF_TEXT );
    sqlite3VdbeAddOp4(v, OP_MakeRecord, regTabname, 3, regTemp, "BBB", 0);
    sqlite3VdbeAddOp2(v, OP_NewRowid, iStatCur, regNewRowid);
    sqlite3VdbeAddOp3(v, OP_Insert, iStatCur, regTemp, regNewRowid);
#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
    sqlite3VdbeChangeP4(v, -1, (char*)pStat1, P4_TABLE);
#endif
    sqlite3VdbeChangeP5(v, OPFLAG_APPEND);

    /* Add the entries to the stat4 table. */
#ifdef SQLITE_ENABLE_STAT4
    {
      int regEq = regStat1;
      int regLt = regStat1+1;
      int regDLt = regStat1+2;
      int regSample = regStat1+3;
      int regCol = regStat1+4;
      int regSampleRowid = regCol + nCol;
      int addrNext;
      int addrIsNull;
      u8 seekOp = HasRowid(pTab) ? OP_NotExists : OP_NotFound;

      pParse->nMem = MAX(pParse->nMem, regCol+nCol);

      addrNext = sqlite3VdbeCurrentAddr(v);
      callStatGet(pParse, regStat4, STAT_GET_ROWID, regSampleRowid);
      addrIsNull = sqlite3VdbeAddOp1(v, OP_IsNull, regSampleRowid);
      VdbeCoverage(v);
      callStatGet(pParse, regStat4, STAT_GET_NEQ, regEq);
      callStatGet(pParse, regStat4, STAT_GET_NLT, regLt);
      callStatGet(pParse, regStat4, STAT_GET_NDLT, regDLt);
      sqlite3VdbeAddOp4Int(v, seekOp, iTabCur, addrNext, regSampleRowid, 0);
      VdbeCoverage(v);
      for(i=0; i<nCol; i++){
        sqlite3ExprCodeLoadIndexColumn(pParse, pIdx, iTabCur, i, regCol+i);
      }
      sqlite3VdbeAddOp3(v, OP_MakeRecord, regCol, nCol, regSample);
      sqlite3VdbeAddOp3(v, OP_MakeRecord, regTabname, 6, regTemp);
................................................................................
      rc = sqlite3ResolveExprNames(pName, pExpr);
    }else{
      pExpr->op = TK_STRING;
    }
  }
  return rc;
}












/*
** An SQL user-function registered to do the work of an ATTACH statement. The
** three arguments to the function come directly from an attach statement:
**
**     ATTACH DATABASE x AS y KEY z
**
................................................................................
    if( db->nDb>=db->aLimit[SQLITE_LIMIT_ATTACHED]+2 ){
      zErrDyn = sqlite3MPrintf(db, "too many attached databases - max %d", 
        db->aLimit[SQLITE_LIMIT_ATTACHED]
      );
      goto attach_error;
    }
    for(i=0; i<db->nDb; i++){
      char *z = db->aDb[i].zDbSName;
      assert( z && zName );
      if( sqlite3StrICmp(z, zName)==0 ){
        zErrDyn = sqlite3MPrintf(db, "database %s is already in use", zName);
        goto attach_error;
      }
    }
  
    /* Allocate the new entry in the db->aDb[] array and initialize the schema
    ** hash tables.
................................................................................
#endif
    sqlite3BtreeLeave(pNew->pBt);
  }
  pNew->safety_level = SQLITE_DEFAULT_SYNCHRONOUS+1;
  if( rc==SQLITE_OK && pNew->zDbSName==0 ){
    rc = SQLITE_NOMEM_BKPT;
  }


#ifdef SQLITE_HAS_CODEC
  if( rc==SQLITE_OK ){
    extern int sqlite3CodecAttach(sqlite3*, int, const void*, int);
    extern void sqlite3CodecGetKey(sqlite3*, int, void**, int*);
    int nKey;
    char *zKey;
    int t = sqlite3_value_type(argv[2]);
    switch( t ){
      case SQLITE_INTEGER:
      case SQLITE_FLOAT:
        zErrDyn = sqlite3DbStrDup(db, "Invalid key value");
        rc = SQLITE_ERROR;
        break;
        
      case SQLITE_TEXT:
      case SQLITE_BLOB:
        nKey = sqlite3_value_bytes(argv[2]);
        zKey = (char *)sqlite3_value_blob(argv[2]);
        rc = sqlite3CodecAttach(db, db->nDb-1, zKey, nKey);
        break;

      case SQLITE_NULL:
        /* No key specified.  Use the key from URI filename, or if none,
        ** use the key from the main database. */
        if( sqlite3CodecQueryParameters(db, zName, zPath)==0 ){
          sqlite3CodecGetKey(db, 0, (void**)&zKey, &nKey);
          if( nKey || sqlite3BtreeGetOptimalReserve(db->aDb[0].pBt)>0 ){
            rc = sqlite3CodecAttach(db, db->nDb-1, zKey, nKey);
          }
        }
        break;
    }
  }
#endif
  sqlite3_free( zPath );

  /* If the file was opened successfully, read the schema for the new database.
  ** If this fails, or if opening the file failed, then close the file and 
  ** remove the entry from the db->aDb[] array. i.e. put everything back the
  ** way we found it.
  */
  if( rc==SQLITE_OK ){
................................................................................

  UNUSED_PARAMETER(NotUsed);

  if( zName==0 ) zName = "";
  for(i=0; i<db->nDb; i++){
    pDb = &db->aDb[i];
    if( pDb->pBt==0 ) continue;
    if( sqlite3StrICmp(pDb->zDbSName, zName)==0 ) break;
  }

  if( i>=db->nDb ){
    sqlite3_snprintf(sizeof(zErr),zErr, "no such database: %s", zName);
    goto detach_error;
  }
  if( i<2 ){
................................................................................
** checks out, these routines return 0.
*/
SQLITE_PRIVATE int sqlite3FixSrcList(
  DbFixer *pFix,       /* Context of the fixation */
  SrcList *pList       /* The Source list to check and modify */
){
  int i;
  const char *zDb;
  struct SrcList_item *pItem;



  if( NEVER(pList==0) ) return 0;
  zDb = pFix->zDb;

  for(i=0, pItem=pList->a; i<pList->nSrc; i++, pItem++){
    if( pFix->bTemp==0 ){
      if( pItem->zDatabase && sqlite3StrICmp(pItem->zDatabase, zDb) ){

        sqlite3ErrorMsg(pFix->pParse,
            "%s %T cannot reference objects in database %s",
            pFix->zType, pFix->pName, pItem->zDatabase);
        return 1;
      }
      sqlite3DbFree(pFix->pParse->db, pItem->zDatabase);
      pItem->zDatabase = 0;
      pItem->pSchema = pFix->pSchema;
      pItem->fg.fromDDL = 1;
    }
#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_TRIGGER)
    if( sqlite3FixSelect(pFix, pItem->pSelect) ) return 1;
    if( sqlite3FixExpr(pFix, pItem->pOn) ) return 1;
................................................................................
#if SQLITE_USER_AUTHENTICATION
  /* Only the admin user is allowed to know that the sqlite_user table
  ** exists */
  if( db->auth.authLevel<UAUTH_Admin && sqlite3UserAuthTable(zName)!=0 ){
    return 0;
  }
#endif
  while(1){
    for(i=OMIT_TEMPDB; i<db->nDb; i++){
      int j = (i<2) ? i^1 : i;   /* Search TEMP before MAIN */
      if( zDatabase==0 || sqlite3StrICmp(zDatabase, db->aDb[j].zDbSName)==0 ){

        assert( sqlite3SchemaMutexHeld(db, j, 0) );
        p = sqlite3HashFind(&db->aDb[j].pSchema->tblHash, zName);




        if( p ) return p;
      }
    }
    /* Not found.  If the name we were looking for was temp.sqlite_master
    ** then change the name to sqlite_temp_master and try again. */

    if( sqlite3StrICmp(zName, MASTER_NAME)!=0 ) break;
    if( sqlite3_stricmp(zDatabase, db->aDb[1].zDbSName)!=0 ) break;
    zName = TEMP_MASTER_NAME;


  }














  return 0;
}

/*
** Locate the in-memory structure that describes a particular database
** table given the name of that table and (optionally) the name of the
** database containing the table.  Return NULL if not found.  Also leave an
** error message in pParse->zErrMsg.
................................................................................
  int i;
  /* All mutexes are required for schema access.  Make sure we hold them. */
  assert( zDb!=0 || sqlite3BtreeHoldsAllMutexes(db) );
  for(i=OMIT_TEMPDB; i<db->nDb; i++){
    int j = (i<2) ? i^1 : i;  /* Search TEMP before MAIN */
    Schema *pSchema = db->aDb[j].pSchema;
    assert( pSchema );
    if( zDb && sqlite3StrICmp(zDb, db->aDb[j].zDbSName) ) continue;
    assert( sqlite3SchemaMutexHeld(db, j, 0) );
    p = sqlite3HashFind(&pSchema->idxHash, zName);
    if( p ) break;
  }
  return p;
}

................................................................................
*/
SQLITE_PRIVATE void sqlite3DeleteColumnNames(sqlite3 *db, Table *pTable){
  int i;
  Column *pCol;
  assert( pTable!=0 );
  if( (pCol = pTable->aCol)!=0 ){
    for(i=0; i<pTable->nCol; i++, pCol++){

      sqlite3DbFree(db, pCol->zName);
      sqlite3ExprDelete(db, pCol->pDflt);
      sqlite3DbFree(db, pCol->zColl);
    }
    sqlite3DbFree(db, pTable->aCol);
  }
}
................................................................................
      return;
    }
    p->aCol = aNew;
  }
  pCol = &p->aCol[p->nCol];
  memset(pCol, 0, sizeof(p->aCol[0]));
  pCol->zName = z;

  sqlite3ColumnPropertiesFromName(p, pCol);
 
  if( pType->n==0 ){
    /* If there is no type specified, columns have the default affinity
    ** 'BLOB' with a default size of 4 bytes. */
    pCol->affinity = SQLITE_AFF_BLOB;
    pCol->szEst = 1;
................................................................................
    }
  }
  assert( pPk->nColumn==j );
  assert( pTab->nNVCol<=j );
  recomputeColumnsNotIndexed(pPk);
}























#ifndef SQLITE_OMIT_VIRTUALTABLE
/*
** Return true if zName is a shadow table name in the current database
** connection.
**
** zName is temporarily modified while this routine is running, but is
** restored to its original value prior to this routine returning.
*/
SQLITE_PRIVATE int sqlite3ShadowTableName(sqlite3 *db, const char *zName){
  char *zTail;                  /* Pointer to the last "_" in zName */
  Table *pTab;                  /* Table that zName is a shadow of */
  Module *pMod;                 /* Module for the virtual table */

  zTail = strrchr(zName, '_');
  if( zTail==0 ) return 0;
  *zTail = 0;
  pTab = sqlite3FindTable(db, zName, 0);
  *zTail = '_';
  if( pTab==0 ) return 0;
  if( !IsVirtual(pTab) ) return 0;
  pMod = (Module*)sqlite3HashFind(&db->aModule, pTab->azModuleArg[0]);
  if( pMod==0 ) return 0;
  if( pMod->pModule->iVersion<3 ) return 0;
  if( pMod->pModule->xShadowName==0 ) return 0;
  return pMod->pModule->xShadowName(zTail+1);
}
#endif /* ifndef SQLITE_OMIT_VIRTUALTABLE */




























/*
** This routine is called to report the final ")" that terminates
** a CREATE TABLE statement.
**
** The table structure that other action routines have been building
** is added to the internal hash tables, assuming no errors have
................................................................................
  if( p->pCheck ){
    sqlite3ResolveSelfReference(pParse, p, NC_IsCheck, 0, p->pCheck);
    if( pParse->nErr ){
      /* If errors are seen, delete the CHECK constraints now, else they might
      ** actually be used if PRAGMA writable_schema=ON is set. */
      sqlite3ExprListDelete(db, p->pCheck);
      p->pCheck = 0;


    }
  }
#endif /* !defined(SQLITE_OMIT_CHECK) */
#ifndef SQLITE_OMIT_GENERATED_COLUMNS
  if( p->tabFlags & TF_HasGenerated ){
    int ii, nNG = 0;
    testcase( p->tabFlags & TF_HasVirtual );
................................................................................
      sqlite3ErrorMsg(pParse, "unable to open a temporary database "
        "file for storing temporary tables");
      pParse->rc = rc;
      return 1;
    }
    db->aDb[1].pBt = pBt;
    assert( db->aDb[1].pSchema );
    if( SQLITE_NOMEM==sqlite3BtreeSetPageSize(pBt, db->nextPagesize, -1, 0) ){
      sqlite3OomFault(db);
      return 1;
    }
  }
  return 0;
}

................................................................................
  int errCode,      /* extended error code */
  int onError,      /* Constraint type */
  char *p4,         /* Error message */
  i8 p4type,        /* P4_STATIC or P4_TRANSIENT */
  u8 p5Errmsg       /* P5_ErrMsg type */
){
  Vdbe *v = sqlite3GetVdbe(pParse);
  assert( (errCode&0xff)==SQLITE_CONSTRAINT );
  if( onError==OE_Abort ){
    sqlite3MayAbort(pParse);
  }
  sqlite3VdbeAddOp4(v, OP_Halt, errCode, onError, 0, p4, p4type);
  sqlite3VdbeChangeP5(v, p5Errmsg);
}

................................................................................
SQLITE_PRIVATE CollSeq *sqlite3FindCollSeq(
  sqlite3 *db,          /* Database connection to search */
  u8 enc,               /* Desired text encoding */
  const char *zName,    /* Name of the collating sequence.  Might be NULL */
  int create            /* True to create CollSeq if doesn't already exist */
){
  CollSeq *pColl;


  if( zName ){
    pColl = findCollSeqEntry(db, zName, create);

  }else{
    pColl = db->pDfltColl;
  }
  assert( SQLITE_UTF8==1 && SQLITE_UTF16LE==2 && SQLITE_UTF16BE==3 );
  assert( enc>=SQLITE_UTF8 && enc<=SQLITE_UTF16BE );
  if( pColl ) pColl += enc-1;
  return pColl;
}














/*
** This function is responsible for invoking the collation factory callback
** or substituting a collation sequence of a different encoding when the
** requested collation sequence is not available in the desired encoding.
** 
** If it is not NULL, then pColl must point to the database native encoding 
................................................................................
        iAddrOnce = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
      }
      testcase( IsVirtual(pTab) );
      sqlite3OpenTableAndIndices(pParse, pTab, OP_OpenWrite, OPFLAG_FORDELETE,
                                 iTabCur, aToOpen, &iDataCur, &iIdxCur);
      assert( pPk || IsVirtual(pTab) || iDataCur==iTabCur );
      assert( pPk || IsVirtual(pTab) || iIdxCur==iDataCur+1 );
      if( eOnePass==ONEPASS_MULTI ) sqlite3VdbeJumpHere(v, iAddrOnce);


    }
  
    /* Set up a loop over the rowids/primary-keys that were found in the
    ** where-clause loop above.
    */
    if( eOnePass!=ONEPASS_OFF ){
      assert( nKey==nPk );  /* OP_Found will use an unpacked key */
................................................................................
    if( pIdx==pPk ) continue;
    if( iIdxCur+i==iIdxNoSeek ) continue;
    VdbeModuleComment((v, "GenRowIdxDel for %s", pIdx->zName));
    r1 = sqlite3GenerateIndexKey(pParse, pIdx, iDataCur, 0, 1,
        &iPartIdxLabel, pPrior, r1);
    sqlite3VdbeAddOp3(v, OP_IdxDelete, iIdxCur+i, r1,
        pIdx->uniqNotNull ? pIdx->nKeyCol : pIdx->nColumn);

    sqlite3ResolvePartIdxLabel(pParse, iPartIdxLabel);
    pPrior = pIdx;
  }
}

/*
** Generate code that will assemble an index key and stores it in register
................................................................................
  sqlite3_value **argv
){
  const unsigned char *zA, *zB;
  u32 escape;
  int nPat;
  sqlite3 *db = sqlite3_context_db_handle(context);
  struct compareInfo *pInfo = sqlite3_user_data(context);


#ifdef SQLITE_LIKE_DOESNT_MATCH_BLOBS
  if( sqlite3_value_type(argv[0])==SQLITE_BLOB
   || sqlite3_value_type(argv[1])==SQLITE_BLOB
  ){
#ifdef SQLITE_TEST
    sqlite3_like_count++;
................................................................................
    if( zEsc==0 ) return;
    if( sqlite3Utf8CharLen((char*)zEsc, -1)!=1 ){
      sqlite3_result_error(context, 
          "ESCAPE expression must be a single character", -1);
      return;
    }
    escape = sqlite3Utf8Read(&zEsc);






  }else{
    escape = pInfo->matchSet;
  }
  zB = sqlite3_value_text(argv[0]);
  zA = sqlite3_value_text(argv[1]);
  if( zA && zB ){
#ifdef SQLITE_TEST
................................................................................
        }
        cntExpand++;
        if( (cntExpand&(cntExpand-1))==0 ){
          /* Grow the size of the output buffer only on substitutions
          ** whose index is a power of two: 1, 2, 4, 8, 16, 32, ... */
          u8 *zOld;
          zOld = zOut;
          zOut = sqlite3_realloc64(zOut, (int)nOut + (nOut - nStr - 1));
          if( zOut==0 ){
            sqlite3_result_error_nomem(context);
            sqlite3_free(zOld);
            return;
          }
        }
      }
................................................................................
  int nExpr;
  if( pExpr->op!=TK_FUNCTION || !pExpr->x.pList ){
    return 0;
  }
  assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
  nExpr = pExpr->x.pList->nExpr;
  pDef = sqlite3FindFunction(db, pExpr->u.zToken, nExpr, SQLITE_UTF8, 0);



  if( NEVER(pDef==0) || (pDef->funcFlags & SQLITE_FUNC_LIKE)==0 ){
    return 0;
  }
  if( nExpr<3 ){
    aWc[3] = 0;
  }else{
    Expr *pEscape = pExpr->x.pList->a[2].pExpr;
    char *zEscape;
    if( pEscape->op!=TK_STRING ) return 0;
    zEscape = pEscape->u.zToken;
    if( zEscape[0]==0 || zEscape[1]!=0 ) return 0;
    aWc[3] = zEscape[0];
  }

  /* The memcpy() statement assumes that the wildcard characters are
  ** the first three statements in the compareInfo structure.  The
  ** asserts() that follow verify that assumption
  */
  memcpy(aWc, pDef->pUserData, 3);
  assert( (char*)&likeInfoAlt == (char*)&likeInfoAlt.matchAll );
  assert( &((char*)&likeInfoAlt)[1] == (char*)&likeInfoAlt.matchOne );
  assert( &((char*)&likeInfoAlt)[2] == (char*)&likeInfoAlt.matchSet );














  *pIsNocase = (pDef->funcFlags & SQLITE_FUNC_CASE)==0;
  return 1;
}

/*
** All of the FuncDef structures in the aBuiltinFunc[] array above
** to the global function hash table.  This occurs at start-time (as
................................................................................
#ifndef SQLITE_OMIT_FLOATING_POINT
    FUNCTION(round,              1, 0, 0, roundFunc        ),
    FUNCTION(round,              2, 0, 0, roundFunc        ),
#endif
    FUNCTION(upper,              1, 0, 0, upperFunc        ),
    FUNCTION(lower,              1, 0, 0, lowerFunc        ),
    FUNCTION(hex,                1, 0, 0, hexFunc          ),
    INLINE_FUNC(ifnull,          2, INLINEFUNC_coalesce, SQLITE_FUNC_COALESCE),
    VFUNCTION(random,            0, 0, 0, randomFunc       ),
    VFUNCTION(randomblob,        1, 0, 0, randomBlob       ),
    FUNCTION(nullif,             2, 0, 1, nullifFunc       ),
    DFUNCTION(sqlite_version,    0, 0, 0, versionFunc      ),
    DFUNCTION(sqlite_source_id,  0, 0, 0, sourceidFunc     ),
    FUNCTION(sqlite_log,         2, 0, 0, errlogFunc       ),
    FUNCTION(quote,              1, 0, 0, quoteFunc        ),
................................................................................
    LIKEFUNC(like, 3, &likeInfoNorm, SQLITE_FUNC_LIKE),
#endif
#ifdef SQLITE_ENABLE_UNKNOWN_SQL_FUNCTION
    FUNCTION(unknown,           -1, 0, 0, unknownFunc      ),
#endif
    FUNCTION(coalesce,           1, 0, 0, 0                ),
    FUNCTION(coalesce,           0, 0, 0, 0                ),
    INLINE_FUNC(coalesce,       -1, INLINEFUNC_coalesce, SQLITE_FUNC_COALESCE),

  };
#ifndef SQLITE_OMIT_ALTERTABLE
  sqlite3AlterFunctions();
#endif
  sqlite3WindowFunctions();
  sqlite3RegisterDateTimeFunctions();
  sqlite3InsertBuiltinFuncs(aBuiltinFunc, ArraySize(aBuiltinFunc));
................................................................................
      sqlite3WhereEnd(pWInfo);
    }
  }

  /* Clean up the WHERE clause constructed above. */
  sqlite3ExprDelete(db, pWhere);
  if( iFkIfZero ){
    sqlite3VdbeJumpHere(v, iFkIfZero);
  }
}

/*
** This function returns a linked list of FKey objects (connected by
** FKey.pNextTo) holding all children of table pTab.  For example,
** given the following schema:
................................................................................
        iReg = sqlite3TableColumnToStorage(pTab, i) + regNewData + 1;
        switch( onError ){
          case OE_Replace: {
            int addr1 = sqlite3VdbeAddOp1(v, OP_NotNull, iReg);
            VdbeCoverage(v);
            assert( (pCol->colFlags & COLFLAG_GENERATED)==0 );
            nSeenReplace++;
            sqlite3ExprCode(pParse, pCol->pDflt, iReg);
            sqlite3VdbeJumpHere(v, addr1);
            break;
          }
          case OE_Abort:
            sqlite3MayAbort(pParse);
            /* Fall through */
          case OE_Rollback:
................................................................................
#ifndef SQLITE_OMIT_CHECK
  if( pTab->pCheck && (db->flags & SQLITE_IgnoreChecks)==0 ){
    ExprList *pCheck = pTab->pCheck;
    pParse->iSelfTab = -(regNewData+1);
    onError = overrideError!=OE_Default ? overrideError : OE_Abort;
    for(i=0; i<pCheck->nExpr; i++){
      int allOk;

      Expr *pExpr = pCheck->a[i].pExpr;
      if( aiChng
       && !sqlite3ExprReferencesUpdatedColumn(pExpr, aiChng, pkChng)
      ){
        /* The check constraints do not reference any of the columns being
        ** updated so there is no point it verifying the check constraint */
        continue;




      }
      allOk = sqlite3VdbeMakeLabel(pParse);
      sqlite3VdbeVerifyAbortable(v, onError);


      sqlite3ExprIfTrue(pParse, pExpr, allOk, SQLITE_JUMPIFNULL);


      if( onError==OE_Ignore ){
        sqlite3VdbeGoto(v, ignoreDest);
      }else{
        char *zName = pCheck->a[i].zEName;
        if( zName==0 ) zName = pTab->zName;
        if( onError==OE_Replace ) onError = OE_Abort; /* IMP: R-26383-51744 */
        sqlite3HaltConstraint(pParse, SQLITE_CONSTRAINT_CHECK,
................................................................................
            VdbeOp x;    /* Conflict check opcode to copy */
            /* The sqlite3VdbeAddOp4() call might reallocate the opcode array.
            ** Hence, make a complete copy of the opcode, rather than using
            ** a pointer to the opcode. */
            x = *sqlite3VdbeGetOp(v, addrConflictCk);
            if( x.opcode!=OP_IdxRowid ){
              int p2;      /* New P2 value for copied conflict check opcode */

              if( sqlite3OpcodeProperty[x.opcode]&OPFLG_JUMP ){
                p2 = lblRecheckOk;
              }else{
                p2 = x.p2;
              }

              sqlite3VdbeAddOp4(v, x.opcode, x.p1, p2, x.p3, x.p4.z, x.p4type);
              sqlite3VdbeChangeP5(v, x.p5);
              VdbeCoverageIf(v, p2!=x.p2);
            }
            nConflictCk--;
            addrConflictCk++;
          }
          /* If the retest fails, issue an abort */
................................................................................
      autoIncStep(pParse, regAutoinc, regRowid);
    }else if( pDest->pIndex==0 && !(db->mDbFlags & DBFLAG_VacuumInto) ){
      addr1 = sqlite3VdbeAddOp2(v, OP_NewRowid, iDest, regRowid);
    }else{
      addr1 = sqlite3VdbeAddOp2(v, OP_Rowid, iSrc, regRowid);
      assert( (pDest->tabFlags & TF_Autoincrement)==0 );
    }
    sqlite3VdbeAddOp3(v, OP_RowData, iSrc, regData, 1);
    if( db->mDbFlags & DBFLAG_Vacuum ){
      sqlite3VdbeAddOp1(v, OP_SeekEnd, iDest);
      insFlags = OPFLAG_NCHANGE|OPFLAG_LASTROWID|
                           OPFLAG_APPEND|OPFLAG_USESEEKRESULT;
    }else{
      insFlags = OPFLAG_NCHANGE|OPFLAG_LASTROWID|OPFLAG_APPEND;
    }

    sqlite3VdbeAddOp4(v, OP_Insert, iDest, regData, regRowid,
                      (char*)pDest, P4_TABLE);
    sqlite3VdbeChangeP5(v, insFlags);
    sqlite3VdbeAddOp2(v, OP_Next, iSrc, addr1); VdbeCoverage(v);
    sqlite3VdbeAddOp2(v, OP_Close, iSrc, 0);
    sqlite3VdbeAddOp2(v, OP_Close, iDest, 0);
  }else{
................................................................................
    sqlite3VdbeSetP4KeyInfo(pParse, pSrcIdx);
    VdbeComment((v, "%s", pSrcIdx->zName));
    sqlite3VdbeAddOp3(v, OP_OpenWrite, iDest, pDestIdx->tnum, iDbDest);
    sqlite3VdbeSetP4KeyInfo(pParse, pDestIdx);
    sqlite3VdbeChangeP5(v, OPFLAG_BULKCSR);
    VdbeComment((v, "%s", pDestIdx->zName));
    addr1 = sqlite3VdbeAddOp2(v, OP_Rewind, iSrc, 0); VdbeCoverage(v);
    sqlite3VdbeAddOp3(v, OP_RowData, iSrc, regData, 1);
    if( db->mDbFlags & DBFLAG_Vacuum ){
      /* This INSERT command is part of a VACUUM operation, which guarantees
      ** that the destination table is empty. If all indexed columns use
      ** collation sequence BINARY, then it can also be assumed that the
      ** index will be populated by inserting keys in strictly sorted 
      ** order. In this case, instead of seeking within the b-tree as part
      ** of every OP_IdxInsert opcode, an OP_SeekEnd is added before the
................................................................................
        const char *zColl = pSrcIdx->azColl[i];
        if( sqlite3_stricmp(sqlite3StrBINARY, zColl) ) break;
      }
      if( i==pSrcIdx->nColumn ){
        idxInsFlags = OPFLAG_USESEEKRESULT;
        sqlite3VdbeAddOp1(v, OP_SeekEnd, iDest);
      }
    }
    if( !HasRowid(pSrc) && pDestIdx->idxType==SQLITE_IDXTYPE_PRIMARYKEY ){
      idxInsFlags |= OPFLAG_NCHANGE;
    }

    sqlite3VdbeAddOp2(v, OP_IdxInsert, iDest, regData);
    sqlite3VdbeChangeP5(v, idxInsFlags|OPFLAG_APPEND);
    sqlite3VdbeAddOp2(v, OP_Next, iSrc, addr1+1); VdbeCoverage(v);
    sqlite3VdbeJumpHere(v, addr1);
    sqlite3VdbeAddOp2(v, OP_Close, iSrc, 0);
    sqlite3VdbeAddOp2(v, OP_Close, iDest, 0);
  }
................................................................................
  int (*drop_modules)(sqlite3*,const char**);
  /* Version 3.31.0 and later */
  sqlite3_int64 (*hard_heap_limit64)(sqlite3_int64);
  const char *(*uri_key)(const char*,int);
  const char *(*filename_database)(const char*);
  const char *(*filename_journal)(const char*);
  const char *(*filename_wal)(const char*);





};

/*
** This is the function signature used for all extension entry points.  It
** is also defined in the file "loadext.c".
*/
typedef int (*sqlite3_loadext_entry)(
................................................................................
#define sqlite3_str_length             sqlite3_api->str_length
#define sqlite3_str_value              sqlite3_api->str_value
/* Version 3.25.0 and later */
#define sqlite3_create_window_function sqlite3_api->create_window_function
/* Version 3.26.0 and later */
#define sqlite3_normalized_sql         sqlite3_api->normalized_sql
/* Version 3.28.0 and later */
#define sqlite3_stmt_isexplain         sqlite3_api->isexplain
#define sqlite3_value_frombind         sqlite3_api->frombind
/* Version 3.30.0 and later */
#define sqlite3_drop_modules           sqlite3_api->drop_modules
/* Version 3.31.0 andn later */
#define sqlite3_hard_heap_limit64      sqlite3_api->hard_heap_limit64
#define sqlite3_uri_key                sqlite3_api->uri_key
#define sqlite3_filename_database      sqlite3_api->filename_database
#define sqlite3_filename_journal       sqlite3_api->filename_journal
#define sqlite3_filename_wal           sqlite3_api->filename_wal




#endif /* !defined(SQLITE_CORE) && !defined(SQLITE_OMIT_LOAD_EXTENSION) */

#if !defined(SQLITE_CORE) && !defined(SQLITE_OMIT_LOAD_EXTENSION)
  /* This case when the file really is being compiled as a loadable 
  ** extension */
# define SQLITE_EXTENSION_INIT1     const sqlite3_api_routines *sqlite3_api=0;
# define SQLITE_EXTENSION_INIT2(v)  sqlite3_api=v;
................................................................................
#endif
  /* Version 3.31.0 and later */
  sqlite3_hard_heap_limit64,
  sqlite3_uri_key,
  sqlite3_filename_database,
  sqlite3_filename_journal,
  sqlite3_filename_wal,




};









/*
** Attempt to load an SQLite extension library contained in the file
** zFile.  The entry point is zProc.  zProc may be 0 in which case a
** default entry point name (sqlite3_extension_init) is used.  Use
** of the default name is recommended.
**
................................................................................
    int ncFile = sqlite3Strlen30(zFile);
    zAltEntry = sqlite3_malloc64(ncFile+30);
    if( zAltEntry==0 ){
      sqlite3OsDlClose(pVfs, handle);
      return SQLITE_NOMEM_BKPT;
    }
    memcpy(zAltEntry, "sqlite3_", 8);
    for(iFile=ncFile-1; iFile>=0 && zFile[iFile]!='/'; iFile--){}
    iFile++;
    if( sqlite3_strnicmp(zFile+iFile, "lib", 3)==0 ) iFile += 3;
    for(iEntry=8; (c = zFile[iFile])!=0 && c!='.'; iFile++){
      if( sqlite3Isalpha(c) ){
        zAltEntry[iEntry++] = (char)sqlite3UpperToLower[(unsigned)c];
      }
    }
................................................................................
/* DO NOT EDIT!
** This file is automatically generated by the script at
** ../tool/mkpragmatab.tcl.  To update the set of pragmas, edit
** that script and rerun it.
*/

/* The various pragma types */


#define PragTyp_HEADER_VALUE                   0
#define PragTyp_AUTO_VACUUM                    1
#define PragTyp_FLAG                           2
#define PragTyp_BUSY_TIMEOUT                   3
#define PragTyp_CACHE_SIZE                     4
#define PragTyp_CACHE_SPILL                    5
#define PragTyp_CASE_SENSITIVE_LIKE            6
#define PragTyp_COLLATION_LIST                 7
#define PragTyp_COMPILE_OPTIONS                8
#define PragTyp_DATA_STORE_DIRECTORY           9
#define PragTyp_DATABASE_LIST                 10
#define PragTyp_DEFAULT_CACHE_SIZE            11
#define PragTyp_ENCODING                      12
#define PragTyp_FOREIGN_KEY_CHECK             13
#define PragTyp_FOREIGN_KEY_LIST              14
#define PragTyp_FUNCTION_LIST                 15
#define PragTyp_HARD_HEAP_LIMIT               16
#define PragTyp_INCREMENTAL_VACUUM            17
#define PragTyp_INDEX_INFO                    18
#define PragTyp_INDEX_LIST                    19
#define PragTyp_INTEGRITY_CHECK               20
#define PragTyp_JOURNAL_MODE                  21
#define PragTyp_JOURNAL_SIZE_LIMIT            22
#define PragTyp_LOCK_PROXY_FILE               23
#define PragTyp_LOCKING_MODE                  24
#define PragTyp_PAGE_COUNT                    25
#define PragTyp_MMAP_SIZE                     26
#define PragTyp_MODULE_LIST                   27
#define PragTyp_OPTIMIZE                      28
#define PragTyp_PAGE_SIZE                     29
#define PragTyp_PRAGMA_LIST                   30
#define PragTyp_SECURE_DELETE                 31
#define PragTyp_SHRINK_MEMORY                 32
#define PragTyp_SOFT_HEAP_LIMIT               33
#define PragTyp_SYNCHRONOUS                   34
#define PragTyp_TABLE_INFO                    35
#define PragTyp_TEMP_STORE                    36
#define PragTyp_TEMP_STORE_DIRECTORY          37
#define PragTyp_THREADS                       38
#define PragTyp_WAL_AUTOCHECKPOINT            39
#define PragTyp_WAL_CHECKPOINT                40
#define PragTyp_ACTIVATE_EXTENSIONS           41
#define PragTyp_KEY                           42
#define PragTyp_LOCK_STATUS                   43
#define PragTyp_STATS                         44

/* Property flags associated with various pragma. */
#define PragFlg_NeedSchema 0x01 /* Force schema load before running */
#define PragFlg_NoColumns  0x02 /* OP_ResultRow called with zero columns */
#define PragFlg_NoColumns1 0x04 /* zero columns if RHS argument is present */
................................................................................
  u8 ePragTyp;             /* PragTyp_XXX value */
  u8 mPragFlg;             /* Zero or more PragFlg_XXX values */
  u8 iPragCName;           /* Start of column names in pragCName[] */
  u8 nPragCName;           /* Num of col names. 0 means use pragma name */
  u64 iArg;                /* Extra argument */
} PragmaName;
static const PragmaName aPragmaName[] = {
#if defined(SQLITE_HAS_CODEC) || defined(SQLITE_ENABLE_CEROD)
 {/* zName:     */ "activate_extensions",
  /* ePragTyp:  */ PragTyp_ACTIVATE_EXTENSIONS,
  /* ePragFlg:  */ 0,
  /* ColNames:  */ 0, 0,
  /* iArg:      */ 0 },
#endif





#if !defined(SQLITE_OMIT_SCHEMA_VERSION_PRAGMAS)
 {/* zName:     */ "application_id",
  /* ePragTyp:  */ PragTyp_HEADER_VALUE,
  /* ePragFlg:  */ PragFlg_NoColumns1|PragFlg_Result0,
  /* ColNames:  */ 0, 0,
  /* iArg:      */ BTREE_APPLICATION_ID },
#endif
................................................................................
#endif
#endif
 {/* zName:     */ "hard_heap_limit",
  /* ePragTyp:  */ PragTyp_HARD_HEAP_LIMIT,
  /* ePragFlg:  */ PragFlg_Result0,
  /* ColNames:  */ 0, 0,
  /* iArg:      */ 0 },
#if defined(SQLITE_HAS_CODEC)
 {/* zName:     */ "hexkey",
  /* ePragTyp:  */ PragTyp_KEY,
  /* ePragFlg:  */ 0,
  /* ColNames:  */ 0, 0,
  /* iArg:      */ 2 },
 {/* zName:     */ "hexrekey",
  /* ePragTyp:  */ PragTyp_KEY,
  /* ePragFlg:  */ 0,
  /* ColNames:  */ 0, 0,
  /* iArg:      */ 3 },
#endif
#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
#if !defined(SQLITE_OMIT_CHECK)
 {/* zName:     */ "ignore_check_constraints",
  /* ePragTyp:  */ PragTyp_FLAG,
  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
  /* ColNames:  */ 0, 0,
  /* iArg:      */ SQLITE_IgnoreChecks },
................................................................................
  /* ePragTyp:  */ PragTyp_JOURNAL_MODE,
  /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result0|PragFlg_SchemaReq,
  /* ColNames:  */ 0, 0,
  /* iArg:      */ 0 },
 {/* zName:     */ "journal_size_limit",
  /* ePragTyp:  */ PragTyp_JOURNAL_SIZE_LIMIT,
  /* ePragFlg:  */ PragFlg_Result0|PragFlg_SchemaReq,
  /* ColNames:  */ 0, 0,
  /* iArg:      */ 0 },
#endif
#if defined(SQLITE_HAS_CODEC)
 {/* zName:     */ "key",
  /* ePragTyp:  */ PragTyp_KEY,
  /* ePragFlg:  */ 0,
  /* ColNames:  */ 0, 0,
  /* iArg:      */ 0 },
#endif
#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
 {/* zName:     */ "legacy_alter_table",
  /* ePragTyp:  */ PragTyp_FLAG,
  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
................................................................................
  /* ColNames:  */ 0, 0,
  /* iArg:      */ SQLITE_ReadUncommit },
 {/* zName:     */ "recursive_triggers",
  /* ePragTyp:  */ PragTyp_FLAG,
  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
  /* ColNames:  */ 0, 0,
  /* iArg:      */ SQLITE_RecTriggers },
#endif
#if defined(SQLITE_HAS_CODEC)
 {/* zName:     */ "rekey",
  /* ePragTyp:  */ PragTyp_KEY,
  /* ePragFlg:  */ 0,
  /* ColNames:  */ 0, 0,
  /* iArg:      */ 1 },
#endif
#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
 {/* zName:     */ "reverse_unordered_selects",
  /* ePragTyp:  */ PragTyp_FLAG,
  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
  /* ColNames:  */ 0, 0,
  /* iArg:      */ SQLITE_ReverseOrder },
#endif
#if !defined(SQLITE_OMIT_SCHEMA_VERSION_PRAGMAS)
................................................................................
  /* iArg:      */ 0 },
 {/* zName:     */ "temp_store_directory",
  /* ePragTyp:  */ PragTyp_TEMP_STORE_DIRECTORY,
  /* ePragFlg:  */ PragFlg_NoColumns1,
  /* ColNames:  */ 0, 0,
  /* iArg:      */ 0 },
#endif
#if defined(SQLITE_HAS_CODEC)
 {/* zName:     */ "textkey",
  /* ePragTyp:  */ PragTyp_KEY,
  /* ePragFlg:  */ 0,
  /* ColNames:  */ 0, 0,
  /* iArg:      */ 4 },
 {/* zName:     */ "textrekey",
  /* ePragTyp:  */ PragTyp_KEY,
  /* ePragFlg:  */ 0,
  /* ColNames:  */ 0, 0,
  /* iArg:      */ 5 },
#endif
 {/* zName:     */ "threads",
  /* ePragTyp:  */ PragTyp_THREADS,
  /* ePragFlg:  */ PragFlg_Result0,
  /* ColNames:  */ 0, 0,
  /* iArg:      */ 0 },
#if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
 {/* zName:     */ "trusted_schema",
................................................................................
 {/* zName:     */ "writable_schema",
  /* ePragTyp:  */ PragTyp_FLAG,
  /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
  /* ColNames:  */ 0, 0,
  /* iArg:      */ SQLITE_WriteSchema|SQLITE_NoSchemaError },
#endif
};
/* Number of pragmas: 66 on by default, 82 total. */

/************** End of pragma.h **********************************************/
/************** Continuing where we left off in pragma.c *********************/

/*
** Interpret the given string as a safety level.  Return 0 for OFF,
** 1 for ON or NORMAL, 2 for FULL, and 3 for EXTRA.  Return 1 for an empty or 
................................................................................
      int size = ALWAYS(pBt) ? sqlite3BtreeGetPageSize(pBt) : 0;
      returnSingleInt(v, size);
    }else{
      /* Malloc may fail when setting the page-size, as there is an internal
      ** buffer that the pager module resizes using sqlite3_realloc().
      */
      db->nextPagesize = sqlite3Atoi(zRight);
      if( SQLITE_NOMEM==sqlite3BtreeSetPageSize(pBt, db->nextPagesize,-1,0) ){
        sqlite3OomFault(db);
      }
    }
    break;
  }

  /*
................................................................................
            }
            sqlite3VdbeJumpHere(v, jmp4);
            sqlite3ResolvePartIdxLabel(pParse, jmp3);
          }
        }
        sqlite3VdbeAddOp2(v, OP_Next, iDataCur, loopTop); VdbeCoverage(v);
        sqlite3VdbeJumpHere(v, loopTop-1);
#ifndef SQLITE_OMIT_BTREECOUNT
        if( !isQuick ){
          sqlite3VdbeLoadString(v, 2, "wrong # of entries in index ");
          for(j=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, j++){
            if( pPk==pIdx ) continue;
            sqlite3VdbeAddOp2(v, OP_Count, iIdxCur+j, 3);
            addr = sqlite3VdbeAddOp3(v, OP_Eq, 8+j, 0, 3); VdbeCoverage(v);
            sqlite3VdbeChangeP5(v, SQLITE_NOTNULL);
            sqlite3VdbeLoadString(v, 4, pIdx->zName);
            sqlite3VdbeAddOp3(v, OP_Concat, 4, 2, 3);
            integrityCheckResultRow(v);
            sqlite3VdbeJumpHere(v, addr);
          }
        }
#endif /* SQLITE_OMIT_BTREECOUNT */
      } 
    }
    {
      static const int iLn = VDBE_OFFSET_LINENO(2);
      static const VdbeOpList endCode[] = {
        { OP_AddImm,      1, 0,        0},    /* 0 */
        { OP_IfNotZero,   1, 4,        0},    /* 1 */
................................................................................
      returnSingleText(v, encnames[ENC(pParse->db)].zName);
    }else{                        /* "PRAGMA encoding = XXX" */
      /* Only change the value of sqlite.enc if the database handle is not
      ** initialized. If the main database exists, the new sqlite.enc value
      ** will be overwritten when the schema is next loaded. If it does not
      ** already exists, it will be created to use the new encoding value.
      */
      int canChangeEnc = 1;  /* True if allowed to change the encoding */
      int i;                 /* For looping over all attached databases */
      for(i=0; i<db->nDb; i++){
        if( db->aDb[i].pBt!=0
         && DbHasProperty(db,i,DB_SchemaLoaded)
         && !DbHasProperty(db,i,DB_Empty)
        ){
          canChangeEnc = 0;
        }
      }
      if( canChangeEnc ){
        for(pEnc=&encnames[0]; pEnc->zName; pEnc++){
          if( 0==sqlite3StrICmp(zRight, pEnc->zName) ){
            SCHEMA_ENC(db) = ENC(db) =
                pEnc->enc ? pEnc->enc : SQLITE_UTF16NATIVE;


            break;
          }
        }
        if( !pEnc->zName ){
          sqlite3ErrorMsg(pParse, "unsupported encoding: %s", zRight);
        }
      }
................................................................................
     && N>=0
    ){
      sqlite3_limit(db, SQLITE_LIMIT_WORKER_THREADS, (int)(N&0x7fffffff));
    }
    returnSingleInt(v, sqlite3_limit(db, SQLITE_LIMIT_WORKER_THREADS, -1));
    break;
  }




















#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
  /*
  ** Report the current state of file logs for all databases
  */
  case PragTyp_LOCK_STATUS: {
    static const char *const azLockName[] = {
................................................................................
      }
      sqlite3VdbeMultiLoad(v, 1, "ss", db->aDb[i].zDbSName, zState);
    }
    break;
  }
#endif

#ifdef SQLITE_HAS_CODEC
  /* Pragma        iArg
  ** ----------   ------
  **  key           0
  **  rekey         1
  **  hexkey        2
  **  hexrekey      3
  **  textkey       4
  **  textrekey     5
  */
  case PragTyp_KEY: {
    if( zRight ){
      char zBuf[40];
      const char *zKey = zRight;
      int n;
      if( pPragma->iArg==2 || pPragma->iArg==3 ){
        u8 iByte;
        int i;
        for(i=0, iByte=0; i<sizeof(zBuf)*2 && sqlite3Isxdigit(zRight[i]); i++){
          iByte = (iByte<<4) + sqlite3HexToInt(zRight[i]);
          if( (i&1)!=0 ) zBuf[i/2] = iByte;
        }
        zKey = zBuf;
        n = i/2;
      }else{
        n = pPragma->iArg<4 ? sqlite3Strlen30(zRight) : -1;
      }
      if( (pPragma->iArg & 1)==0 ){
        rc = sqlite3_key_v2(db, zDb, zKey, n);
      }else{
        rc = sqlite3_rekey_v2(db, zDb, zKey, n);
      }
      if( rc==SQLITE_OK && n!=0 ){
        sqlite3VdbeSetNumCols(v, 1);
        sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "ok", SQLITE_STATIC);
        returnSingleText(v, "ok");
      }
    }
    break;
  }
#endif
#if defined(SQLITE_HAS_CODEC) || defined(SQLITE_ENABLE_CEROD)
  case PragTyp_ACTIVATE_EXTENSIONS: if( zRight ){
#ifdef SQLITE_HAS_CODEC
    if( sqlite3StrNICmp(zRight, "see-", 4)==0 ){
      sqlite3_activate_see(&zRight[4]);
    }
#endif
#ifdef SQLITE_ENABLE_CEROD
    if( sqlite3StrNICmp(zRight, "cerod-", 6)==0 ){
      sqlite3_activate_cerod(&zRight[6]);
    }
#endif
  }
  break;
#endif

  } /* End of the PRAGMA switch */

  /* The following block is a no-op unless SQLITE_DEBUG is defined. Its only
................................................................................
  InitData *pData = (InitData*)pInit;
  sqlite3 *db = pData->db;
  int iDb = pData->iDb;

  assert( argc==5 );
  UNUSED_PARAMETER2(NotUsed, argc);
  assert( sqlite3_mutex_held(db->mutex) );
  DbClearProperty(db, iDb, DB_Empty);
  pData->nInitRow++;
  if( db->mallocFailed ){
    corruptSchema(pData, argv[1], 0);
    return 1;
  }

  assert( iDb>=0 && iDb<db->nDb );
................................................................................
#endif
  Db *pDb;
  char const *azArg[6];
  int meta[5];
  InitData initData;
  const char *zMasterName;
  int openedTransaction = 0;


  assert( (db->mDbFlags & DBFLAG_SchemaKnownOk)==0 );
  assert( iDb>=0 && iDb<db->nDb );
  assert( db->aDb[iDb].pSchema );
  assert( sqlite3_mutex_held(db->mutex) );
  assert( iDb==1 || sqlite3BtreeHoldsMutex(db->aDb[iDb].pBt) );

................................................................................
  initData.db = db;
  initData.iDb = iDb;
  initData.rc = SQLITE_OK;
  initData.pzErrMsg = pzErrMsg;
  initData.mInitFlags = mFlags;
  initData.nInitRow = 0;
  sqlite3InitCallback(&initData, 5, (char **)azArg, 0);

  if( initData.rc ){
    rc = initData.rc;
    goto error_out;
  }

  /* Create a cursor to hold the database open
  */
................................................................................

  /* If opening a non-empty database, check the text encoding. For the
  ** main database, set sqlite3.enc to the encoding of the main database.
  ** For an attached db, it is an error if the encoding is not the same
  ** as sqlite3.enc.
  */
  if( meta[BTREE_TEXT_ENCODING-1] ){  /* text encoding */
    if( iDb==0 ){
#ifndef SQLITE_OMIT_UTF16
      u8 encoding;

      /* If opening the main database, set ENC(db). */
      encoding = (u8)meta[BTREE_TEXT_ENCODING-1] & 3;
      if( encoding==0 ) encoding = SQLITE_UTF8;
      ENC(db) = encoding;
#else
      ENC(db) = SQLITE_UTF8;
#endif

    }else{
      /* If opening an attached database, the encoding much match ENC(db) */
      if( meta[BTREE_TEXT_ENCODING-1]!=ENC(db) ){
        sqlite3SetString(pzErrMsg, db, "attached databases must use the same"
            " text encoding as main database");
        rc = SQLITE_ERROR;
        goto initone_error_out;
      }
    }
  }else{
    DbSetProperty(db, iDb, DB_Empty);
  }
  pDb->pSchema->enc = ENC(db);

  if( pDb->pSchema->cache_size==0 ){
#ifndef SQLITE_OMIT_DEPRECATED
    size = sqlite3AbsInt32(meta[BTREE_DEFAULT_CACHE_SIZE-1]);
    if( size==0 ){ size = SQLITE_DEFAULT_CACHE_SIZE; }
................................................................................
/*
** Initialize all database files - the main database file, the file
** used to store temporary tables, and any additional database files
** created using ATTACH statements.  Return a success code.  If an
** error occurs, write an error message into *pzErrMsg.
**
** After a database is initialized, the DB_SchemaLoaded bit is set
** bit is set in the flags field of the Db structure. If the database
** file was of zero-length, then the DB_Empty flag is also set.
*/
SQLITE_PRIVATE int sqlite3Init(sqlite3 *db, char **pzErrMsg){
  int i, rc;
  int commit_internal = !(db->mDbFlags&DBFLAG_SchemaChange);
  
  assert( sqlite3_mutex_held(db->mutex) );
  assert( sqlite3BtreeHoldsMutex(db->aDb[0].pBt) );
................................................................................
    sqlite3ExprDelete(db, p->pHaving);
    sqlite3ExprListDelete(db, p->pOrderBy);
    sqlite3ExprDelete(db, p->pLimit);
#ifndef SQLITE_OMIT_WINDOWFUNC
    if( OK_IF_ALWAYS_TRUE(p->pWinDefn) ){
      sqlite3WindowListDelete(db, p->pWinDefn);
    }
    assert( p->pWin==0 );
#endif
    if( OK_IF_ALWAYS_TRUE(p->pWith) ) sqlite3WithDelete(db, p->pWith);
    if( bFree ) sqlite3DbFreeNN(db, p);
    p = pPrior;
    bFree = 1;
  }
}
................................................................................
        for(j=nName-1; j>0 && sqlite3Isdigit(zName[j]); j--){}
        if( zName[j]==':' ) nName = j;
      }
      zName = sqlite3MPrintf(db, "%.*z:%u", nName, zName, ++cnt);
      if( cnt>3 ) sqlite3_randomness(sizeof(cnt), &cnt);
    }
    pCol->zName = zName;

    sqlite3ColumnPropertiesFromName(0, pCol);
    if( zName && sqlite3HashInsert(&ht, zName, pCol)==pCol ){
      sqlite3OomFault(db);
    }
  }
  sqlite3HashClear(&ht);
  if( db->mallocFailed ){
................................................................................
        }
        sqlite3ExprDelete(db, p->pLimit);
        p->pLimit = pLimit;
  
        /* Generate code to take the intersection of the two temporary
        ** tables.
        */

        assert( p->pEList );
        iBreak = sqlite3VdbeMakeLabel(pParse);
        iCont = sqlite3VdbeMakeLabel(pParse);
        computeLimitRegisters(pParse, p, iBreak);
        sqlite3VdbeAddOp2(v, OP_Rewind, tab1, iBreak); VdbeCoverage(v);
        r1 = sqlite3GetTempReg(pParse);
        iStart = sqlite3VdbeAddOp2(v, OP_RowData, tab1, r1);
................................................................................
){
  if( pExpr==0 ) return 0;
  if( ExprHasProperty(pExpr, EP_FromJoin)
   && pExpr->iRightJoinTable==pSubst->iTable
  ){
    pExpr->iRightJoinTable = pSubst->iNewTable;
  }

  if( pExpr->op==TK_COLUMN && pExpr->iTable==pSubst->iTable ){


    if( pExpr->iColumn<0 ){
      pExpr->op = TK_NULL;
    }else{
      Expr *pNew;
      Expr *pCopy = pSubst->pEList->a[pExpr->iColumn].pExpr;
      Expr ifNullRow;
      assert( pSubst->pEList!=0 && pExpr->iColumn<pSubst->pEList->nExpr );
................................................................................
      }else{
        sqlite3 *db = pSubst->pParse->db;
        if( pSubst->isLeftJoin && pCopy->op!=TK_COLUMN ){
          memset(&ifNullRow, 0, sizeof(ifNullRow));
          ifNullRow.op = TK_IF_NULL_ROW;
          ifNullRow.pLeft = pCopy;
          ifNullRow.iTable = pSubst->iNewTable;

          pCopy = &ifNullRow;
        }
        testcase( ExprHasProperty(pCopy, EP_Subquery) );
        pNew = sqlite3ExprDup(db, pCopy, 0);
        if( pNew && pSubst->isLeftJoin ){
          ExprSetProperty(pNew, EP_CanBeNull);
        }
................................................................................
    for(i=pSrc->nSrc, pItem=pSrc->a; i>0; i--, pItem++){
      substSelect(pSubst, pItem->pSelect, 1);
      if( pItem->fg.isTabFunc ){
        substExprList(pSubst, pItem->u1.pFuncArg);
      }
    }
  }while( doPrior && (p = p->pPrior)!=0 );
































}
#endif /* !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW) */

#if !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW)
/*
** This routine attempts to flatten subqueries as a performance optimization.
** This routine returns 1 if it makes changes and 0 if no flattening occurs.
................................................................................
    ** One is tempted to try to add a and b to combine the limits.  But this
    ** does not work if either limit is negative.
    */
    if( pSub->pLimit ){
      pParent->pLimit = pSub->pLimit;
      pSub->pLimit = 0;
    }






  }

  /* Finially, delete what is left of the subquery and return
  ** success.
  */
  sqlite3SelectDelete(db, pSub1);

................................................................................
  Expr *pValue,        /* The VALUE part of the constraint */
  Expr *pExpr          /* Overall expression: COLUMN=VALUE or VALUE=COLUMN */
){
  int i;
  assert( pColumn->op==TK_COLUMN );
  assert( sqlite3ExprIsConstant(pValue) );

  if( !ExprHasProperty(pValue, EP_FixedCol) && sqlite3ExprAffinity(pValue)!=0 ){
    return;
  }
  if( !sqlite3IsBinary(sqlite3ExprCompareCollSeq(pConst->pParse,pExpr)) ){
    return;
  }

  /* 2018-10-25 ticket [cf5ed20f]
  ** Make sure the same pColumn is not inserted more than once */
  for(i=0; i<pConst->nConst; i++){
................................................................................

  pConst->nConst++;
  pConst->apExpr = sqlite3DbReallocOrFree(pConst->pParse->db, pConst->apExpr,
                         pConst->nConst*2*sizeof(Expr*));
  if( pConst->apExpr==0 ){
    pConst->nConst = 0;
  }else{
    if( ExprHasProperty(pValue, EP_FixedCol) ){
      pValue = pValue->pLeft;
    }
    pConst->apExpr[pConst->nConst*2-2] = pColumn;
    pConst->apExpr[pConst->nConst*2-1] = pValue;
  }
}

/*
** Find all terms of COLUMN=VALUE or VALUE=COLUMN in pExpr where VALUE
................................................................................
** analysis.
*/
static u8 minMaxQuery(sqlite3 *db, Expr *pFunc, ExprList **ppMinMax){
  int eRet = WHERE_ORDERBY_NORMAL;      /* Return value */
  ExprList *pEList = pFunc->x.pList;    /* Arguments to agg function */
  const char *zFunc;                    /* Name of aggregate function pFunc */
  ExprList *pOrderBy;
  u8 sortFlags;

  assert( *ppMinMax==0 );
  assert( pFunc->op==TK_AGG_FUNCTION );
  assert( !IsWindowFunc(pFunc) );
  if( pEList==0 || pEList->nExpr!=1 || ExprHasProperty(pFunc, EP_WinFunc) ){
    return eRet;
  }
  zFunc = pFunc->u.zToken;
  if( sqlite3StrICmp(zFunc, "min")==0 ){
    eRet = WHERE_ORDERBY_MIN;

    sortFlags = KEYINFO_ORDER_BIGNULL;

  }else if( sqlite3StrICmp(zFunc, "max")==0 ){
    eRet = WHERE_ORDERBY_MAX;
    sortFlags = KEYINFO_ORDER_DESC;
  }else{
    return eRet;
  }
  *ppMinMax = pOrderBy = sqlite3ExprListDup(db, pEList, 0);
................................................................................
** names and other FROM clause elements. 
*/
static void selectPopWith(Walker *pWalker, Select *p){
  Parse *pParse = pWalker->pParse;
  if( OK_IF_ALWAYS_TRUE(pParse->pWith) && p->pPrior==0 ){
    With *pWith = findRightmost(p)->pWith;
    if( pWith!=0 ){
      assert( pParse->pWith==pWith );
      pParse->pWith = pWith->pOuter;
    }
  }
}
#else
#define selectPopWith 0
#endif
................................................................................
        pFrom->pTab = 0;
        return WRC_Abort;
      }
      pTab->nTabRef++;
      if( !IsVirtual(pTab) && cannotBeFunction(pParse, pFrom) ){
        return WRC_Abort;
      }
#if !defined(SQLITE_OMIT_VIEW) && !defined(SQLITE_OMIT_VIRTUALTABLE)
      if( IsVirtual(pTab) || pTab->pSelect ){
        i16 nCol;
        u8 eCodeOrig = pWalker->eCode;
        if( sqlite3ViewGetColumnNames(pParse, pTab) ) return WRC_Abort;
        assert( pFrom->pSelect==0 );
        if( pTab->pSelect && (db->flags & SQLITE_EnableView)==0 ){
          sqlite3ErrorMsg(pParse, "access to view \"%s\" prohibited",
            pTab->zName);
        }

        if( IsVirtual(pTab)
         && pFrom->fg.fromDDL
         && ALWAYS(pTab->pVTable!=0)
         && pTab->pVTable->eVtabRisk > ((db->flags & SQLITE_TrustedSchema)!=0)
        ){
          sqlite3ErrorMsg(pParse, "unsafe use of virtual table \"%s\"",
                                  pTab->zName);
        }

        pFrom->pSelect = sqlite3SelectDup(db, pTab->pSelect, 0);
        nCol = pTab->nCol;
        pTab->nCol = -1;
        pWalker->eCode = 1;  /* Turn on Select.selId renumbering */
        sqlite3WalkSelect(pWalker, pFrom->pSelect);
        pWalker->eCode = eCodeOrig;
        pTab->nCol = nCol;
................................................................................
              }
            }else{
              pExpr = pRight;
            }
            pNew = sqlite3ExprListAppend(pParse, pNew, pExpr);
            sqlite3TokenInit(&sColname, zColname);
            sqlite3ExprListSetName(pParse, pNew, &sColname, 0);
            if( pNew && (p->selFlags & SF_NestedFrom)!=0 ){
              struct ExprList_item *pX = &pNew->a[pNew->nExpr-1];
              sqlite3DbFree(db, pX->zEName);
              if( pSub ){
                pX->zEName = sqlite3DbStrDup(db, pSub->pEList->a[j].zEName);
                testcase( pX->zEName==0 );
              }else{
                pX->zEName = sqlite3MPrintf(db, "%s.%s.%s",
................................................................................
*/
static void resetAccumulator(Parse *pParse, AggInfo *pAggInfo){
  Vdbe *v = pParse->pVdbe;
  int i;
  struct AggInfo_func *pFunc;
  int nReg = pAggInfo->nFunc + pAggInfo->nColumn;
  if( nReg==0 ) return;

#ifdef SQLITE_DEBUG
  /* Verify that all AggInfo registers are within the range specified by
  ** AggInfo.mnReg..AggInfo.mxReg */
  assert( nReg==pAggInfo->mxReg-pAggInfo->mnReg+1 );
  for(i=0; i<pAggInfo->nColumn; i++){
    assert( pAggInfo->aCol[i].iMem>=pAggInfo->mnReg
         && pAggInfo->aCol[i].iMem<=pAggInfo->mxReg );
................................................................................
  }
  for(i=0, pC=pAggInfo->aCol; i<pAggInfo->nAccumulator; i++, pC++){
    sqlite3ExprCode(pParse, pC->pExpr, pC->iMem);
  }

  pAggInfo->directMode = 0;
  if( addrHitTest ){
    sqlite3VdbeJumpHere(v, addrHitTest);
  }
}

/*
** Add a single OP_Explain instruction to the VDBE to explain a simple
** count(*) query ("SELECT count(*) FROM pTab").
*/
................................................................................
      resetAccumulator(pParse, &sAggInfo);
      sqlite3VdbeAddOp2(v, OP_Integer, 0, iUseFlag);
      VdbeComment((v, "indicate accumulator empty"));
      sqlite3VdbeAddOp1(v, OP_Return, regReset);
     
    } /* endif pGroupBy.  Begin aggregate queries without GROUP BY: */
    else {
#ifndef SQLITE_OMIT_BTREECOUNT
      Table *pTab;
      if( (pTab = isSimpleCount(p, &sAggInfo))!=0 ){
        /* If isSimpleCount() returns a pointer to a Table structure, then
        ** the SQL statement is of the form:
        **
        **   SELECT count(*) FROM <tbl>
        **
................................................................................
        **
        ** (2013-10-03) Do not count the entries in a partial index.
        **
        ** In practice the KeyInfo structure will not be used. It is only 
        ** passed to keep OP_OpenRead happy.
        */
        if( !HasRowid(pTab) ) pBest = sqlite3PrimaryKeyIndex(pTab);

        for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
          if( pIdx->bUnordered==0
           && pIdx->szIdxRow<pTab->szTabRow
           && pIdx->pPartIdxWhere==0
           && (!pBest || pIdx->szIdxRow<pBest->szIdxRow)
          ){
            pBest = pIdx;

          }
        }
        if( pBest ){
          iRoot = pBest->tnum;
          pKeyInfo = sqlite3KeyInfoOfIndex(pParse, pBest);
        }

................................................................................
        sqlite3VdbeAddOp4Int(v, OP_OpenRead, iCsr, iRoot, iDb, 1);
        if( pKeyInfo ){
          sqlite3VdbeChangeP4(v, -1, (char *)pKeyInfo, P4_KEYINFO);
        }
        sqlite3VdbeAddOp2(v, OP_Count, iCsr, sAggInfo.aFunc[0].iMem);
        sqlite3VdbeAddOp1(v, OP_Close, iCsr);
        explainSimpleCount(pParse, pTab, pBest);
      }else
#endif /* SQLITE_OMIT_BTREECOUNT */
      {
        int regAcc = 0;           /* "populate accumulators" flag */

        /* If there are accumulator registers but no min() or max() functions
        ** without FILTER clauses, allocate register regAcc. Register regAcc
        ** will contain 0 the first time the inner loop runs, and 1 thereafter.
        ** The code generated by updateAccumulator() uses this to ensure
        ** that the accumulator registers are (a) updated only once if
................................................................................
    need = nCol*2;
  }else{
    need = nCol;
  }
  if( p->nData + need > p->nAlloc ){
    char **azNew;
    p->nAlloc = p->nAlloc*2 + need;
    azNew = sqlite3_realloc64( p->azResult, sizeof(char*)*p->nAlloc );
    if( azNew==0 ) goto malloc_failed;
    p->azResult = azNew;
  }

  /* If this is the first row, then generate an extra row containing
  ** the names of all columns.
  */
................................................................................
  sqlite3_free(res.zErrMsg);
  if( rc!=SQLITE_OK ){
    sqlite3_free_table(&res.azResult[1]);
    return rc;
  }
  if( res.nAlloc>res.nData ){
    char **azNew;
    azNew = sqlite3_realloc64( res.azResult, sizeof(char*)*res.nData );
    if( azNew==0 ){
      sqlite3_free_table(&res.azResult[1]);
      db->errCode = SQLITE_NOMEM;
      return SQLITE_NOMEM_BKPT;
    }
    res.azResult = azNew;
  }
................................................................................

  assert( pName->nSrc==1 );
  zDb = pName->a[0].zDatabase;
  zName = pName->a[0].zName;
  assert( zDb!=0 || sqlite3BtreeHoldsAllMutexes(db) );
  for(i=OMIT_TEMPDB; i<db->nDb; i++){
    int j = (i<2) ? i^1 : i;  /* Search TEMP before MAIN */
    if( zDb && sqlite3StrICmp(db->aDb[j].zDbSName, zDb) ) continue;
    assert( sqlite3SchemaMutexHeld(db, j, 0) );
    pTrigger = sqlite3HashFind(&(db->aDb[j].pSchema->trigHash), zName);
    if( pTrigger ) break;
  }
  if( !pTrigger ){
    if( !noErr ){
      sqlite3ErrorMsg(pParse, "no such trigger: %S", pName, 0);
................................................................................
** into the sqlite_master table.)
**
** Therefore, the P4 parameter is only required if the default value for
** the column is a literal number, string or null. The sqlite3ValueFromExpr()
** function is capable of transforming these types of expressions into
** sqlite3_value objects.
**
** If parameter iReg is not negative, code an OP_RealAffinity instruction
** on register iReg. This is used when an equivalent integer value is 
** stored in place of an 8-byte floating point value in order to save 
** space.
*/
SQLITE_PRIVATE void sqlite3ColumnDefault(Vdbe *v, Table *pTab, int i, int iReg){
  assert( pTab!=0 );
  if( !pTab->pSelect ){
    sqlite3_value *pValue = 0;
    u8 enc = ENC(sqlite3VdbeDb(v));
    Column *pCol = &pTab->aCol[i];
................................................................................
    sqlite3ValueFromExpr(sqlite3VdbeDb(v), pCol->pDflt, enc, 
                         pCol->affinity, &pValue);
    if( pValue ){
      sqlite3VdbeAppendP4(v, pValue, P4_MEM);
    }
  }
#ifndef SQLITE_OMIT_FLOATING_POINT
  if( pTab->aCol[i].affinity==SQLITE_AFF_REAL ){
    sqlite3VdbeAddOp1(v, OP_RealAffinity, iReg);
  }
#endif
}

/*
** Check to see if column iCol of index pIdx references any of the
................................................................................
      }
  
      if( eOnePass==ONEPASS_MULTI && (nIdx-(aiCurOnePass[1]>=0))>0 ){
        addrOnce = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
      }
      sqlite3OpenTableAndIndices(pParse, pTab, OP_OpenWrite, 0, iBaseCur,
                                 aToOpen, 0, 0);
      if( addrOnce ) sqlite3VdbeJumpHere(v, addrOnce);


    }
  
    /* Top of the update loop */
    if( eOnePass!=ONEPASS_OFF ){
      if( !isView && aiCurOnePass[0]!=iDataCur && aiCurOnePass[1]!=iDataCur ){
        assert( pPk );
        sqlite3VdbeAddOp4Int(v, OP_NotFound, iDataCur, labelBreak, regKey,nKey);
................................................................................
    if( id->pMethods!=0 && (sqlite3OsFileSize(id, &sz)!=SQLITE_OK || sz>0) ){
      rc = SQLITE_ERROR;
      sqlite3SetString(pzErrMsg, db, "output file already exists");
      goto end_of_vacuum;
    }
    db->mDbFlags |= DBFLAG_VacuumInto;
  }
  nRes = sqlite3BtreeGetOptimalReserve(pMain);

  /* A VACUUM cannot change the pagesize of an encrypted database. */
#ifdef SQLITE_HAS_CODEC
  if( db->nextPagesize ){
    extern void sqlite3CodecGetKey(sqlite3*, int, void**, int*);
    int nKey;
    char *zKey;
    sqlite3CodecGetKey(db, iDb, (void**)&zKey, &nKey);
    if( nKey ) db->nextPagesize = 0;
  }
#endif

  sqlite3BtreeSetCacheSize(pTemp, db->aDb[iDb].pSchema->cache_size);
  sqlite3BtreeSetSpillSize(pTemp, sqlite3BtreeSetSpillSize(pMain,0));
  sqlite3BtreeSetPagerFlags(pTemp, PAGER_SYNCHRONOUS_OFF|PAGER_CACHESPILL);

  /* Begin a transaction and take an exclusive lock on the main database
  ** file. This is done before the sqlite3BtreeGetPageSize(pMain) call below,
................................................................................
  /* Restore the original value of db->flags */
  db->init.iDb = 0;
  db->mDbFlags = saved_mDbFlags;
  db->flags = saved_flags;
  db->nChange = saved_nChange;
  db->nTotalChange = saved_nTotalChange;
  db->mTrace = saved_mTrace;
  sqlite3BtreeSetPageSize(pMain, -1, -1, 1);

  /* Currently there is an SQL level transaction open on the vacuum
  ** database. No locks are held on any other files (since the main file
  ** was committed at the btree level). So it safe to end the transaction
  ** by manually setting the autoCommit flag to true and detaching the
  ** vacuum database. The vacuum_db journal file is deleted when the pager
  ** is closed by the DETACH.
................................................................................
  Table **apVtabLock;

  assert( IsVirtual(pTab) );
  for(i=0; i<pToplevel->nVtabLock; i++){
    if( pTab==pToplevel->apVtabLock[i] ) return;
  }
  n = (pToplevel->nVtabLock+1)*sizeof(pToplevel->apVtabLock[0]);
  apVtabLock = sqlite3_realloc64(pToplevel->apVtabLock, n);
  if( apVtabLock ){
    pToplevel->apVtabLock = apVtabLock;
    pToplevel->apVtabLock[pToplevel->nVtabLock++] = pTab;
  }else{
    sqlite3OomFault(pToplevel->db);
  }
}
................................................................................
#  define TERM_VNULL    0x0000 /* Disabled if not using stat4 */
#endif
#define TERM_LIKEOPT    0x0100 /* Virtual terms from the LIKE optimization */
#define TERM_LIKECOND   0x0200 /* Conditionally this LIKE operator term */
#define TERM_LIKE       0x0400 /* The original LIKE operator */
#define TERM_IS         0x0800 /* Term.pExpr is an IS operator */
#define TERM_VARSELECT  0x1000 /* Term.pExpr contains a correlated sub-query */







/*
** An instance of the WhereScan object is used as an iterator for locating
** terms in the WHERE clause that are useful to the query planner.
*/
struct WhereScan {
  WhereClause *pOrigWC;      /* Original, innermost WhereClause */
................................................................................
  ExprList *pOrderBy;       /* ORDER BY clause */
  WhereLoop *pNew;          /* Template WhereLoop */
  WhereOrSet *pOrSet;       /* Record best loops here, if not NULL */
#ifdef SQLITE_ENABLE_STAT4
  UnpackedRecord *pRec;     /* Probe for stat4 (if required) */
  int nRecValid;            /* Number of valid fields currently in pRec */
#endif
  unsigned int bldFlags;    /* SQLITE_BLDF_* flags */

  unsigned int iPlanLimit;  /* Search limiter */
};

/* Allowed values for WhereLoopBuider.bldFlags */
#define SQLITE_BLDF_INDEXED  0x0001   /* An index is used */
#define SQLITE_BLDF_UNIQUE   0x0002   /* All keys of a UNIQUE index used */



/* The WhereLoopBuilder.iPlanLimit is used to limit the number of
** index+constraint combinations the query planner will consider for a
** particular query.  If this parameter is unlimited, then certain
** pathological queries can spend excess time in the sqlite3WhereBegin()
** routine.  The limit is high enough that is should not impact real-world
** queries.
................................................................................
        pCompare = sqlite3PExpr(pParse, TK_EQ, 0, 0);
        assert( pCompare!=0 || db->mallocFailed );
        if( pCompare ){
          pCompare->pLeft = pTerm->pExpr->pLeft;
          pCompare->pRight = pRight = sqlite3Expr(db, TK_REGISTER, 0);
          if( pRight ){
            pRight->iTable = iReg+j+2;

            sqlite3ExprIfFalse(pParse, pCompare, pLevel->addrCont, 0);

          }
          pCompare->pLeft = 0;
          sqlite3ExprDelete(db, pCompare);
        }
      }
    }
    assert( iIn==0 || db->mallocFailed );
................................................................................
    ){
      assert( bSeekPastNull==0 && nExtraReg==0 && nBtm==0 && nTop==0 );
      assert( pRangeEnd==0 && pRangeStart==0 );
      testcase( pLoop->nSkip>0 );
      nExtraReg = 1;
      bSeekPastNull = 1;
      pLevel->regBignull = regBignull = ++pParse->nMem;



      pLevel->addrBignull = sqlite3VdbeMakeLabel(pParse);
    }

    /* If we are doing a reverse order scan on an ascending index, or
    ** a forward order scan on a descending index, interchange the 
    ** start and end terms (pRangeStart and pRangeEnd).
    */
................................................................................
    ** virtual table on their second argument, which is the same as
    ** the left-hand side operand in their in-fix form.
    **
    **       vtab_column MATCH expression
    **       MATCH(expression,vtab_column)
    */
    pCol = pList->a[1].pExpr;
    if( pCol->op==TK_COLUMN && IsVirtual(pCol->y.pTab) ){

      for(i=0; i<ArraySize(aOp); i++){
        if( sqlite3StrICmp(pExpr->u.zToken, aOp[i].zOp)==0 ){
          *peOp2 = aOp[i].eOp2;
          *ppRight = pList->a[0].pExpr;
          *ppLeft = pCol;
          return 1;
        }
................................................................................
    **      OVERLOADED(vtab_column,expression)
    **
    ** Historically, xFindFunction expected to see lower-case function
    ** names.  But for this use case, xFindFunction is expected to deal
    ** with function names in an arbitrary case.
    */
    pCol = pList->a[0].pExpr;
    if( pCol->op==TK_COLUMN && IsVirtual(pCol->y.pTab) ){

      sqlite3_vtab *pVtab;
      sqlite3_module *pMod;
      void (*xNotUsed)(sqlite3_context*,int,sqlite3_value**);
      void *pNotUsed;
      pVtab = sqlite3GetVTable(db, pCol->y.pTab)->pVtab;
      assert( pVtab!=0 );
      assert( pVtab->pModule!=0 );
................................................................................
        }
      }
    }
  }else if( pExpr->op==TK_NE || pExpr->op==TK_ISNOT || pExpr->op==TK_NOTNULL ){
    int res = 0;
    Expr *pLeft = pExpr->pLeft;
    Expr *pRight = pExpr->pRight;
    if( pLeft->op==TK_COLUMN && IsVirtual(pLeft->y.pTab) ){

      res++;
    }
    if( pRight && pRight->op==TK_COLUMN && IsVirtual(pRight->y.pTab) ){

      res++;
      SWAP(Expr*, pLeft, pRight);
    }
    *ppLeft = pLeft;
    *ppRight = pRight;
    if( pExpr->op==TK_NE ) *peOp2 = SQLITE_INDEX_CONSTRAINT_NE;
    if( pExpr->op==TK_ISNOT ) *peOp2 = SQLITE_INDEX_CONSTRAINT_ISNOT;
................................................................................
        /* If a truth probability is specified using the likelihood() hints,
        ** then use the probability provided by the application. */
        pLoop->nOut += pTerm->truthProb;
      }else{
        /* In the absence of explicit truth probabilities, use heuristics to
        ** guess a reasonable truth probability. */
        pLoop->nOut--;
        if( pTerm->eOperator&(WO_EQ|WO_IS) ){


          Expr *pRight = pTerm->pExpr->pRight;
          int k = 0;
          testcase( pTerm->pExpr->op==TK_IS );
          if( sqlite3ExprIsInteger(pRight, &k) && k>=(-1) && k<=1 ){
            k = 10;
          }else{
            k = 20;
          }
          if( iReduce<k ) iReduce = k;



        }
      }
    }
  }
  if( pLoop->nOut > nRow-iReduce )  pLoop->nOut = nRow - iReduce;
}

................................................................................
    if( (pSrc->fg.jointype & JT_LEFT)!=0
     && !ExprHasProperty(pTerm->pExpr, EP_FromJoin)
    ){
      continue;
    }

    if( IsUniqueIndex(pProbe) && saved_nEq==pProbe->nKeyCol-1 ){
      pBuilder->bldFlags |= SQLITE_BLDF_UNIQUE;
    }else{
      pBuilder->bldFlags |= SQLITE_BLDF_INDEXED;
    }
    pNew->wsFlags = saved_wsFlags;
    pNew->u.btree.nEq = saved_nEq;
    pNew->u.btree.nBtm = saved_nBtm;
    pNew->u.btree.nTop = saved_nTop;
    pNew->nLTerm = saved_nLTerm;
    if( whereLoopResize(db, pNew, pNew->nLTerm+1) ) break; /* OOM */
................................................................................
          }else{
            rc = whereInScanEst(pParse, pBuilder, pExpr->x.pList, &nOut);
          }
          if( rc==SQLITE_NOTFOUND ) rc = SQLITE_OK;
          if( rc!=SQLITE_OK ) break;          /* Jump out of the pTerm loop */
          if( nOut ){
            pNew->nOut = sqlite3LogEst(nOut);





















            if( pNew->nOut>saved_nOut ) pNew->nOut = saved_nOut;
            pNew->nOut -= nIn;
          }
        }
        if( nOut==0 )
#endif
        {
................................................................................
  ** On the other hand, the extra seeks could end up being significantly
  ** more expensive.  */
  assert( 42==sqlite3LogEst(18) );
  if( saved_nEq==saved_nSkip
   && saved_nEq+1<pProbe->nKeyCol
   && saved_nEq==pNew->nLTerm
   && pProbe->noSkipScan==0

   && OptimizationEnabled(db, SQLITE_SkipScan)
   && pProbe->aiRowLogEst[saved_nEq+1]>=42  /* TUNING: Minimum for skip-scan */
   && (rc = whereLoopResize(db, pNew, pNew->nLTerm+1))==SQLITE_OK
  ){
    LogEst nIter;
    pNew->u.btree.nEq++;
    pNew->nSkip++;
................................................................................
        whereLoopOutputAdjust(pWC, pNew, rSize);
        rc = whereLoopInsert(pBuilder, pNew);
        pNew->nOut = rSize;
        if( rc ) break;
      }
    }

    pBuilder->bldFlags = 0;
    rc = whereLoopAddBtreeIndex(pBuilder, pSrc, pProbe, 0);
    if( pBuilder->bldFlags==SQLITE_BLDF_INDEXED ){
      /* If a non-unique index is used, or if a prefix of the key for
      ** unique index is used (making the index functionally non-unique)
      ** then the sqlite_stat1 data becomes important for scoring the
      ** plan */
      pTab->tabFlags |= TF_StatsUsed;
    }
#ifdef SQLITE_ENABLE_STAT4
................................................................................
        ** optimization, and then only if they are actually used
        ** by the query plan */
        assert( wctrlFlags & WHERE_ORDERBY_LIMIT );
        for(j=0; j<pLoop->nLTerm && pTerm!=pLoop->aLTerm[j]; j++){}
        if( j>=pLoop->nLTerm ) continue;
      }
      if( (pTerm->eOperator&(WO_EQ|WO_IS))!=0 && pOBExpr->iColumn>=0 ){
        if( sqlite3ExprCollSeqMatch(pWInfo->pParse, 
                  pOrderBy->a[i].pExpr, pTerm->pExpr)==0 ){



          continue;
        }
        testcase( pTerm->pExpr->op==TK_IS );
      }
      obSat |= MASKBIT(i);
    }

................................................................................
  w.eCode = 1;
  w.xExprCallback = exprNodeIsDeterministic;
  w.xSelectCallback = sqlite3SelectWalkFail;
  sqlite3WalkExpr(&w, p);
  return w.eCode;
}























/*
** Generate the beginning of the loop used for WHERE clause processing.
** The return value is a pointer to an opaque structure that contains
** information needed to terminate the loop.  Later, the calling routine
** should invoke sqlite3WhereEnd() with the return value of this function
** in order to complete the WHERE clause processing.
**
................................................................................
    sqlite3WhereClausePrint(sWLB.pWC);
  }
#endif

  if( nTabList!=1 || whereShortCut(&sWLB)==0 ){
    rc = whereLoopAddAll(&sWLB);
    if( rc ) goto whereBeginError;
  








#ifdef WHERETRACE_ENABLED
    if( sqlite3WhereTrace ){    /* Display all of the WhereLoop objects */



      WhereLoop *p;
      int i;
      static const char zLabel[] = "0123456789abcdefghijklmnopqrstuvwyxz"
                                             "ABCDEFGHIJKLMNOPQRSTUVWYXZ";
      for(p=pWInfo->pLoops, i=0; p; p=p->pNextLoop, i++){
        p->cId = zLabel[i%(sizeof(zLabel)-1)];
        sqlite3WhereLoopPrint(p, sWLB.pWC);


      }


    }
#endif

  
    wherePathSolver(pWInfo, 0);
    if( db->mallocFailed ) goto whereBeginError;
    if( pWInfo->pOrderBy ){
       wherePathSolver(pWInfo, pWInfo->nRowOut+1);
       if( db->mallocFailed ) goto whereBeginError;
    }
................................................................................
        sqlite3VdbeSetP4KeyInfo(pParse, pIx);
        if( (pLoop->wsFlags & WHERE_CONSTRAINT)!=0
         && (pLoop->wsFlags & (WHERE_COLUMN_RANGE|WHERE_SKIPSCAN))==0
         && (pLoop->wsFlags & WHERE_BIGNULL_SORT)==0
         && (pWInfo->wctrlFlags&WHERE_ORDERBY_MIN)==0
         && pWInfo->eDistinct!=WHERE_DISTINCT_ORDERED
        ){
          sqlite3VdbeChangeP5(v, OPFLAG_SEEKEQ); /* Hint to COMDB2 */
        }
        VdbeComment((v, "%s", pIx->zName));
#ifdef SQLITE_ENABLE_COLUMN_USED_MASK
        {
          u64 colUsed = 0;
          int ii, jj;
          for(ii=0; ii<pIx->nColumn; ii++){
................................................................................
      int j;
      sqlite3VdbeResolveLabel(v, pLevel->addrNxt);
      for(j=pLevel->u.in.nIn, pIn=&pLevel->u.in.aInLoop[j-1]; j>0; j--, pIn--){
        sqlite3VdbeJumpHere(v, pIn->addrInTop+1);
        if( pIn->eEndLoopOp!=OP_Noop ){
          if( pIn->nPrefix ){
            assert( pLoop->wsFlags & WHERE_IN_EARLYOUT );
            if( (pLoop->wsFlags & WHERE_VIRTUALTABLE)==0 ){
              sqlite3VdbeAddOp4Int(v, OP_IfNoHope, pLevel->iIdxCur,
                  sqlite3VdbeCurrentAddr(v)+2+(pLevel->iLeftJoin!=0),
                  pIn->iBase, pIn->nPrefix);
              VdbeCoverage(v);
            }
            if( pLevel->iLeftJoin ){
              /* For LEFT JOIN queries, cursor pIn->iCur may not have been
              ** opened yet. This occurs for WHERE clauses such as
              ** "a = ? AND b IN (...)", where the index is on (a, b). If
              ** the RHS of the (a=?) is NULL, then the "b IN (...)" may
              ** never have been coded, but the body of the loop run to
              ** return the null-row. So, if the cursor is not open yet,
              ** jump over the OP_Next or OP_Prev instruction about to
              ** be coded.  */
              sqlite3VdbeAddOp2(v, OP_IfNotOpen, pIn->iCur, 
                  sqlite3VdbeCurrentAddr(v) + 2

              );
              VdbeCoverage(v);






            }
          }
          sqlite3VdbeAddOp2(v, pIn->eEndLoopOp, pIn->iCur, pIn->addrInTop);
          VdbeCoverage(v);
          VdbeCoverageIf(v, pIn->eEndLoopOp==OP_Prev);
          VdbeCoverageIf(v, pIn->eEndLoopOp==OP_Next);
        }
................................................................................
  ExprList *pAppend,      /* List of values to append. Might be NULL */
  int bIntToNull
){
  if( pAppend ){
    int i;
    int nInit = pList ? pList->nExpr : 0;
    for(i=0; i<pAppend->nExpr; i++){
      int iDummy;
      Expr *pDup = sqlite3ExprDup(pParse->db, pAppend->a[i].pExpr, 0);
      assert( pDup==0 || !ExprHasProperty(pDup, EP_MemToken) );
      if( bIntToNull && pDup && sqlite3ExprIsInteger(pDup, &iDummy) ){






        pDup->op = TK_NULL;
        pDup->flags &= ~(EP_IntValue|EP_IsTrue|EP_IsFalse);
        pDup->u.zToken = 0;

      }
      pList = sqlite3ExprListAppend(pParse, pList, pDup);
      if( pList ) pList->a[nInit+i].sortFlags = pAppend->a[i].sortFlags;
    }
  }
  return pList;
}
................................................................................
    Expr *pHaving = p->pHaving;
    ExprList *pSort = 0;

    ExprList *pSublist = 0;       /* Expression list for sub-query */
    Window *pMWin = p->pWin;      /* Master window object */
    Window *pWin;                 /* Window object iterator */
    Table *pTab;


    pTab = sqlite3DbMallocZero(db, sizeof(Table));
    if( pTab==0 ){
      return sqlite3ErrorToParser(db, SQLITE_NOMEM);
    }

    p->pSrc = 0;
................................................................................
    p->pSrc = sqlite3SrcListAppend(pParse, 0, 0, 0);
    if( p->pSrc ){
      Table *pTab2;
      p->pSrc->a[0].pSelect = pSub;
      sqlite3SrcListAssignCursors(pParse, p->pSrc);
      pSub->selFlags |= SF_Expanded;
      pTab2 = sqlite3ResultSetOfSelect(pParse, pSub, SQLITE_AFF_NONE);

      if( pTab2==0 ){
        /* Might actually be some other kind of error, but in that case
        ** pParse->nErr will be set, so if SQLITE_NOMEM is set, we will get
        ** the correct error message regardless. */
        rc = SQLITE_NOMEM;
      }else{
        memcpy(pTab, pTab2, sizeof(Table));
................................................................................
static int windowInitAccum(Parse *pParse, Window *pMWin){
  Vdbe *v = sqlite3GetVdbe(pParse);
  int regArg;
  int nArg = 0;
  Window *pWin;
  for(pWin=pMWin; pWin; pWin=pWin->pNextWin){
    FuncDef *pFunc = pWin->pFunc;

    sqlite3VdbeAddOp2(v, OP_Null, 0, pWin->regAccum);
    nArg = MAX(nArg, windowArgCount(pWin));
    if( pMWin->regStartRowid==0 ){
      if( pFunc->zName==nth_valueName || pFunc->zName==first_valueName ){
        sqlite3VdbeAddOp2(v, OP_Integer, 0, pWin->regApp);
        sqlite3VdbeAddOp2(v, OP_Integer, 0, pWin->regApp+1);
      }
................................................................................
      pNew->pPartition = sqlite3ExprListDup(db, p->pPartition, 0);
      pNew->pOrderBy = sqlite3ExprListDup(db, p->pOrderBy, 0);
      pNew->eFrmType = p->eFrmType;
      pNew->eEnd = p->eEnd;
      pNew->eStart = p->eStart;
      pNew->eExclude = p->eExclude;
      pNew->regResult = p->regResult;




      pNew->pStart = sqlite3ExprDup(db, p->pStart, 0);
      pNew->pEnd = sqlite3ExprDup(db, p->pEnd, 0);
      pNew->pOwner = pOwner;
      pNew->bImplicitFrame = p->bImplicitFrame;
    }
  }
  return pNew;
................................................................................
  static Expr *tokenExpr(Parse *pParse, int op, Token t){
    Expr *p = sqlite3DbMallocRawNN(pParse->db, sizeof(Expr)+t.n+1);
    if( p ){
      /* memset(p, 0, sizeof(Expr)); */
      p->op = (u8)op;
      p->affExpr = 0;
      p->flags = EP_Leaf;

      p->iAgg = -1;
      p->pLeft = p->pRight = 0;
      p->x.pList = 0;
      p->pAggInfo = 0;
      p->y.pTab = 0;
      p->op2 = 0;
      p->iTable = 0;
................................................................................
      **      expr1 NOT IN ()
      **
      ** simplify to constants 0 (false) and 1 (true), respectively,
      ** regardless of the value of expr1.
      */
      sqlite3ExprUnmapAndDelete(pParse, yymsp[-4].minor.yy202);
      yymsp[-4].minor.yy202 = sqlite3Expr(pParse->db, TK_INTEGER, yymsp[-3].minor.yy192 ? "1" : "0");







    }else{
      yymsp[-4].minor.yy202 = sqlite3PExpr(pParse, TK_IN, yymsp[-4].minor.yy202, 0);
      if( yymsp[-4].minor.yy202 ){
        yymsp[-4].minor.yy202->x.pList = yymsp[-1].minor.yy242;
        sqlite3ExprSetHeightAndFlags(pParse, yymsp[-4].minor.yy202);
      }else{
        sqlite3ExprListDelete(pParse->db, yymsp[-1].minor.yy242);
................................................................................
static int keywordCode(const char *z, int n, int *pType){
  int i, j;
  const char *zKW;
  if( n>=2 ){
    i = ((charMap(z[0])*4) ^ (charMap(z[n-1])*3) ^ n) % 127;
    for(i=((int)aKWHash[i])-1; i>=0; i=((int)aKWNext[i])-1){
      if( aKWLen[i]!=n ) continue;
      j = 0;
      zKW = &zKWText[aKWOffset[i]];
#ifdef SQLITE_ASCII



      while( j<n && (z[j]&~0x20)==zKW[j] ){ j++; }
#endif
#ifdef SQLITE_EBCDIC



      while( j<n && toupper(z[j])==zKW[j] ){ j++; }
#endif
      if( j<n ) continue;
      testcase( i==0 ); /* REINDEX */
      testcase( i==1 ); /* INDEXED */
      testcase( i==2 ); /* INDEX */
      testcase( i==3 ); /* DESC */
................................................................................
  yyParser sEngine;    /* Space to hold the Lemon-generated Parser object */
#endif
  VVA_ONLY( u8 startedWithOom = db->mallocFailed );

  assert( zSql!=0 );
  mxSqlLen = db->aLimit[SQLITE_LIMIT_SQL_LENGTH];
  if( db->nVdbeActive==0 ){
    db->u1.isInterrupted = 0;
  }
  pParse->rc = SQLITE_OK;
  pParse->zTail = zSql;
  assert( pzErrMsg!=0 );
#ifdef SQLITE_DEBUG
  if( db->flags & SQLITE_ParserTrace ){
    printf("parser: [[[%s]]]\n", zSql);
................................................................................
      assert( tokenType==TK_SPACE || tokenType==TK_OVER || tokenType==TK_FILTER
           || tokenType==TK_ILLEGAL || tokenType==TK_WINDOW 
      );
#else
    if( tokenType>=TK_SPACE ){
      assert( tokenType==TK_SPACE || tokenType==TK_ILLEGAL );
#endif /* SQLITE_OMIT_WINDOWFUNC */
      if( db->u1.isInterrupted ){
        pParse->rc = SQLITE_INTERRUPT;
        break;
      }
      if( tokenType==TK_SPACE ){
        zSql += n;
        continue;
      }
................................................................................
}  /* extern "C" */
#endif  /* __cplusplus */


/************** End of sqliteicu.h *******************************************/
/************** Continuing where we left off in main.c ***********************/
#endif

























#ifdef SQLITE_ENABLE_JSON1
SQLITE_PRIVATE int sqlite3Json1Init(sqlite3*);
#endif
#ifdef SQLITE_ENABLE_STMTVTAB
SQLITE_PRIVATE int sqlite3StmtVtabInit(sqlite3*);
#endif















#ifdef SQLITE_ENABLE_FTS5
SQLITE_PRIVATE int sqlite3Fts5Init(sqlite3*);
#endif
























#ifndef SQLITE_AMALGAMATION
/* IMPLEMENTATION-OF: R-46656-45156 The sqlite3_version[] string constant
** contains the text of SQLITE_VERSION macro. 
*/
SQLITE_API const char sqlite3_version[] = SQLITE_VERSION;
#endif
................................................................................
  assert( SQLITE_PTRSIZE==sizeof(char*) );

  /* If SQLite is already completely initialized, then this call
  ** to sqlite3_initialize() should be a no-op.  But the initialization
  ** must be complete.  So isInit must not be set until the very end
  ** of this routine.
  */
  if( sqlite3GlobalConfig.isInit ) return SQLITE_OK;




  /* Make sure the mutex subsystem is initialized.  If unable to 
  ** initialize the mutex subsystem, return early with the error.
  ** If the system is so sick that we are unable to allocate a mutex,
  ** there is not much SQLite is going to be able to do.
  **
  ** The mutex subsystem must take care of serializing its own
................................................................................
    if( rc==SQLITE_OK ){
      rc = sqlite3MemdbInit();
    }
#endif
    if( rc==SQLITE_OK ){
      sqlite3PCacheBufferSetup( sqlite3GlobalConfig.pPage, 
          sqlite3GlobalConfig.szPage, sqlite3GlobalConfig.nPage);

      sqlite3GlobalConfig.isInit = 1;
#ifdef SQLITE_EXTRA_INIT
      bRunExtraInit = 1;
#endif
    }
    sqlite3GlobalConfig.inProgress = 0;
  }
................................................................................
** argument.
**
** Return non-zero to retry the lock.  Return zero to stop trying
** and cause SQLite to return SQLITE_BUSY.
*/
static int sqliteDefaultBusyCallback(
  void *ptr,               /* Database connection */
  int count,               /* Number of times table has been busy */
  sqlite3_file *pFile      /* The file on which the lock occurred */
){
#if SQLITE_OS_WIN || HAVE_USLEEP
  /* This case is for systems that have support for sleeping for fractions of
  ** a second.  Examples:  All windows systems, unix systems with usleep() */
  static const u8 delays[] =
     { 1, 2, 5, 10, 15, 20, 25, 25,  25,  50,  50, 100 };
  static const u8 totals[] =
     { 0, 1, 3,  8, 18, 33, 53, 78, 103, 128, 178, 228 };
# define NDELAY ArraySize(delays)
  sqlite3 *db = (sqlite3 *)ptr;
  int tmout = db->busyTimeout;
  int delay, prior;

#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
  if( sqlite3OsFileControl(pFile,SQLITE_FCNTL_LOCK_TIMEOUT,&tmout)==SQLITE_OK ){
    if( count ){
      tmout = 0;
      sqlite3OsFileControl(pFile, SQLITE_FCNTL_LOCK_TIMEOUT, &tmout);
      return 0;
    }else{
      return 1;
    }
  }
#else
  UNUSED_PARAMETER(pFile);
#endif
  assert( count>=0 );
  if( count < NDELAY ){
    delay = delays[count];
    prior = totals[count];
  }else{
    delay = delays[NDELAY-1];
    prior = totals[NDELAY-1] + delay*(count-(NDELAY-1));
................................................................................
  sqlite3OsSleep(db->pVfs, delay*1000);
  return 1;
#else
  /* This case for unix systems that lack usleep() support.  Sleeping
  ** must be done in increments of whole seconds */
  sqlite3 *db = (sqlite3 *)ptr;
  int tmout = ((sqlite3 *)ptr)->busyTimeout;
  UNUSED_PARAMETER(pFile);
  if( (count+1)*1000 > tmout ){
    return 0;
  }
  sqlite3OsSleep(db->pVfs, 1000000);
  return 1;
#endif
}
................................................................................
**
** This routine is called when an operation failed to acquire a
** lock on VFS file pFile.
**
** If this routine returns non-zero, the lock is retried.  If it
** returns 0, the operation aborts with an SQLITE_BUSY error.
*/
SQLITE_PRIVATE int sqlite3InvokeBusyHandler(BusyHandler *p, sqlite3_file *pFile){
  int rc;
  if( p->xBusyHandler==0 || p->nBusy<0 ) return 0;
  if( p->bExtraFileArg ){
    /* Add an extra parameter with the pFile pointer to the end of the
    ** callback argument list */
    int (*xTra)(void*,int,sqlite3_file*);
    xTra = (int(*)(void*,int,sqlite3_file*))p->xBusyHandler;
    rc = xTra(p->pBusyArg, p->nBusy, pFile);
  }else{
    /* Legacy style busy handler callback */
    rc = p->xBusyHandler(p->pBusyArg, p->nBusy);
  }
  if( rc==0 ){
    p->nBusy = -1;
  }else{
    p->nBusy++;
  }
  return rc; 
}
................................................................................
#ifdef SQLITE_ENABLE_API_ARMOR
  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
#endif
  sqlite3_mutex_enter(db->mutex);
  db->busyHandler.xBusyHandler = xBusy;
  db->busyHandler.pBusyArg = pArg;
  db->busyHandler.nBusy = 0;
  db->busyHandler.bExtraFileArg = 0;
  db->busyTimeout = 0;
  sqlite3_mutex_leave(db->mutex);
  return SQLITE_OK;
}

#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
/*
................................................................................
#ifdef SQLITE_ENABLE_API_ARMOR
  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
#endif
  if( ms>0 ){
    sqlite3_busy_handler(db, (int(*)(void*,int))sqliteDefaultBusyCallback,
                             (void*)db);
    db->busyTimeout = ms;
    db->busyHandler.bExtraFileArg = 1;
  }else{
    sqlite3_busy_handler(db, 0, 0);
  }
  return SQLITE_OK;
}

/*
................................................................................
SQLITE_API void sqlite3_interrupt(sqlite3 *db){
#ifdef SQLITE_ENABLE_API_ARMOR
  if( !sqlite3SafetyCheckOk(db) && (db==0 || db->magic!=SQLITE_MAGIC_ZOMBIE) ){
    (void)SQLITE_MISUSE_BKPT;
    return;
  }
#endif
  db->u1.isInterrupted = 1;
}


/*
** This function is exactly the same as sqlite3_create_function(), except
** that it is designed to be called by internal code. The difference is
** that if a malloc() fails in sqlite3_create_function(), an error code
................................................................................
    sqlite3Error(db, rc);
  }
  rc = sqlite3ApiExit(db, rc);

  /* If there are no active statements, clear the interrupt flag at this
  ** point.  */
  if( db->nVdbeActive==0 ){
    db->u1.isInterrupted = 0;
  }

  sqlite3_mutex_leave(db->mutex);
  return rc;
#endif
}

................................................................................
** itself. When this function is called the *pFlags variable should contain
** the default flags to open the database handle with. The value stored in
** *pFlags may be updated before returning if the URI filename contains 
** "cache=xxx" or "mode=xxx" query parameters.
**
** If successful, SQLITE_OK is returned. In this case *ppVfs is set to point to
** the VFS that should be used to open the database file. *pzFile is set to
** point to a buffer containing the name of the file to open. It is the 
** responsibility of the caller to eventually call sqlite3_free() to release
** this buffer.


**
** If an error occurs, then an SQLite error code is returned and *pzErrMsg
** may be set to point to a buffer containing an English language error 
** message. It is the responsibility of the caller to eventually release
** this buffer by calling sqlite3_free().
*/
SQLITE_PRIVATE int sqlite3ParseUri(
................................................................................
            || sqlite3GlobalConfig.bOpenUri) /* IMP: R-51689-46548 */
   && nUri>=5 && memcmp(zUri, "file:", 5)==0 /* IMP: R-57884-37496 */
  ){
    char *zOpt;
    int eState;                   /* Parser state when parsing URI */
    int iIn;                      /* Input character index */
    int iOut = 0;                 /* Output character index */
    u64 nByte = nUri+2;           /* Bytes of space to allocate */

    /* Make sure the SQLITE_OPEN_URI flag is set to indicate to the VFS xOpen 
    ** method that there may be extra parameters following the file-name.  */
    flags |= SQLITE_OPEN_URI;

    for(iIn=0; iIn<nUri; iIn++) nByte += (zUri[iIn]=='&');
    zFile = sqlite3_malloc64(nByte);
    if( !zFile ) return SQLITE_NOMEM_BKPT;




    iIn = 5;
#ifdef SQLITE_ALLOW_URI_AUTHORITY
    if( strncmp(zUri+5, "///", 3)==0 ){
      iIn = 7;
      /* The following condition causes URIs with five leading / characters
      ** like file://///host/path to be converted into UNCs like //host/path.
................................................................................
      }else if( (eState==0 && c=='?') || (eState==2 && c=='&') ){
        c = 0;
        eState = 1;
      }
      zFile[iOut++] = c;
    }
    if( eState==1 ) zFile[iOut++] = '\0';
    zFile[iOut++] = '\0';
    zFile[iOut++] = '\0';

    /* Check if there were any options specified that should be interpreted 
    ** here. Options that are interpreted here include "vfs" and those that
    ** correspond to flags that may be passed to the sqlite3_open_v2()
    ** method. */
    zOpt = &zFile[sqlite3Strlen30(zFile)+1];
    while( zOpt[0] ){
................................................................................
        }
      }

      zOpt = &zVal[nVal+1];
    }

  }else{
    zFile = sqlite3_malloc64(nUri+2);
    if( !zFile ) return SQLITE_NOMEM_BKPT;


    if( nUri ){
      memcpy(zFile, zUri, nUri);
    }
    zFile[nUri] = '\0';
    zFile[nUri+1] = '\0';
    flags &= ~SQLITE_OPEN_URI;
  }

  *ppVfs = sqlite3_vfs_find(zVfs);
  if( *ppVfs==0 ){
    *pzErrMsg = sqlite3_mprintf("no such vfs: %s", zVfs);
    rc = SQLITE_ERROR;
  }
 parse_uri_out:
  if( rc!=SQLITE_OK ){
    sqlite3_free(zFile);
    zFile = 0;
  }
  *pFlags = flags;
  *pzFile = zFile;
  return rc;
}

#if defined(SQLITE_HAS_CODEC)
/*

** Process URI filename query parameters relevant to the SQLite Encryption
** Extension.  Return true if any of the relevant query parameters are
** seen and return false if not.
*/


SQLITE_PRIVATE int sqlite3CodecQueryParameters(
  sqlite3 *db,           /* Database connection */
  const char *zDb,       /* Which schema is being created/attached */
  const char *zUri       /* URI filename */
){
  const char *zKey;
  if( (zKey = sqlite3_uri_parameter(zUri, "hexkey"))!=0 && zKey[0] ){
    u8 iByte;
    int i;
    char zDecoded[40];
    for(i=0, iByte=0; i<sizeof(zDecoded)*2 && sqlite3Isxdigit(zKey[i]); i++){
      iByte = (iByte<<4) + sqlite3HexToInt(zKey[i]);
      if( (i&1)!=0 ) zDecoded[i/2] = iByte;
    }
    sqlite3_key_v2(db, zDb, zDecoded, i/2);
    return 1;
  }else if( (zKey = sqlite3_uri_parameter(zUri, "key"))!=0 ){
    sqlite3_key_v2(db, zDb, zKey, sqlite3Strlen30(zKey));
    return 1;
  }else if( (zKey = sqlite3_uri_parameter(zUri, "textkey"))!=0 ){
    sqlite3_key_v2(db, zDb, zKey, -1);
    return 1;
  }else{
    return 0;
  }
}
#endif


/*
** This routine does the work of opening a database on behalf of
** sqlite3_open() and sqlite3_open16(). The database filename "zFilename"  
** is UTF-8 encoded.
*/
................................................................................
  const char *zVfs       /* Name of the VFS to use */
){
  sqlite3 *db;                    /* Store allocated handle here */
  int rc;                         /* Return code */
  int isThreadsafe;               /* True for threadsafe connections */
  char *zOpen = 0;                /* Filename argument to pass to BtreeOpen() */
  char *zErrMsg = 0;              /* Error message from sqlite3ParseUri() */


#ifdef SQLITE_ENABLE_API_ARMOR
  if( ppDb==0 ) return SQLITE_MISUSE_BKPT;
#endif
  *ppDb = 0;
#ifndef SQLITE_OMIT_AUTOINIT
  rc = sqlite3_initialize();
................................................................................
#endif
#if defined(SQLITE_ENABLE_QPSG)
                 | SQLITE_EnableQPSG
#endif
#if defined(SQLITE_DEFAULT_DEFENSIVE)
                 | SQLITE_Defensive
#endif



      ;
  sqlite3HashInit(&db->aCollSeq);
#ifndef SQLITE_OMIT_VIRTUALTABLE
  sqlite3HashInit(&db->aModule);
#endif

  /* Add the default collation sequence BINARY. BINARY works for both UTF-8
................................................................................
  createCollation(db, sqlite3StrBINARY, SQLITE_UTF16BE, 0, binCollFunc, 0);
  createCollation(db, sqlite3StrBINARY, SQLITE_UTF16LE, 0, binCollFunc, 0);
  createCollation(db, "NOCASE", SQLITE_UTF8, 0, nocaseCollatingFunc, 0);
  createCollation(db, "RTRIM", SQLITE_UTF8, 0, rtrimCollFunc, 0);
  if( db->mallocFailed ){
    goto opendb_out;
  }
  /* EVIDENCE-OF: R-08308-17224 The default collating function for all
  ** strings is BINARY. 
  */
  db->pDfltColl = sqlite3FindCollSeq(db, SQLITE_UTF8, sqlite3StrBINARY, 0);
  assert( db->pDfltColl!=0 );

  /* Parse the filename/URI argument
  **
  ** Only allow sensible combinations of bits in the flags argument.  
  ** Throw an error if any non-sense combination is used.  If we
  ** do not block illegal combinations here, it could trigger
  ** assert() statements in deeper layers.  Sensible combinations
................................................................................
  assert( SQLITE_OPEN_READONLY  == 0x01 );
  assert( SQLITE_OPEN_READWRITE == 0x02 );
  assert( SQLITE_OPEN_CREATE    == 0x04 );
  testcase( (1<<(flags&7))==0x02 ); /* READONLY */
  testcase( (1<<(flags&7))==0x04 ); /* READWRITE */
  testcase( (1<<(flags&7))==0x40 ); /* READWRITE | CREATE */
  if( ((1<<(flags&7)) & 0x46)==0 ){
    rc = SQLITE_MISUSE_BKPT;  /* IMP: R-65497-44594 */
  }else{
    rc = sqlite3ParseUri(zVfs, zFilename, &flags, &db->pVfs, &zOpen, &zErrMsg);
  }
  if( rc!=SQLITE_OK ){
    if( rc==SQLITE_NOMEM ) sqlite3OomFault(db);
    sqlite3ErrorWithMsg(db, rc, zErrMsg ? "%s" : 0, zErrMsg);
    sqlite3_free(zErrMsg);
................................................................................
      rc = SQLITE_NOMEM_BKPT;
    }
    sqlite3Error(db, rc);
    goto opendb_out;
  }
  sqlite3BtreeEnter(db->aDb[0].pBt);
  db->aDb[0].pSchema = sqlite3SchemaGet(db, db->aDb[0].pBt);
  if( !db->mallocFailed ) ENC(db) = SCHEMA_ENC(db);


  sqlite3BtreeLeave(db->aDb[0].pBt);
  db->aDb[1].pSchema = sqlite3SchemaGet(db, 0);

  /* The default safety_level for the main database is FULL; for the temp
  ** database it is OFF. This matches the pager layer defaults.  
  */
  db->aDb[0].zDbSName = "main";
................................................................................
  ** database schema yet. This is delayed until the first time the database
  ** is accessed.
  */
  sqlite3Error(db, SQLITE_OK);
  sqlite3RegisterPerConnectionBuiltinFunctions(db);
  rc = sqlite3_errcode(db);

#ifdef SQLITE_ENABLE_FTS5

  /* Register any built-in FTS5 module before loading the automatic
  ** extensions. This allows automatic extensions to register FTS5 
  ** tokenizers and auxiliary functions.  */
  if( !db->mallocFailed && rc==SQLITE_OK ){
    rc = sqlite3Fts5Init(db);
  }
#endif

  /* Load automatic extensions - extensions that have been registered
  ** using the sqlite3_automatic_extension() API.
  */
  if( rc==SQLITE_OK ){
    sqlite3AutoLoadExtensions(db);
    rc = sqlite3_errcode(db);
    if( rc!=SQLITE_OK ){
      goto opendb_out;
    }
  }

#ifdef SQLITE_ENABLE_FTS1
  if( !db->mallocFailed ){
    extern int sqlite3Fts1Init(sqlite3*);
    rc = sqlite3Fts1Init(db);
  }
#endif

#ifdef SQLITE_ENABLE_FTS2
  if( !db->mallocFailed && rc==SQLITE_OK ){
    extern int sqlite3Fts2Init(sqlite3*);
    rc = sqlite3Fts2Init(db);
  }
#endif

#ifdef SQLITE_ENABLE_FTS3 /* automatically defined by SQLITE_ENABLE_FTS4 */
  if( !db->mallocFailed && rc==SQLITE_OK ){
    rc = sqlite3Fts3Init(db);
  }
#endif

#if defined(SQLITE_ENABLE_ICU) || defined(SQLITE_ENABLE_ICU_COLLATIONS)
  if( !db->mallocFailed && rc==SQLITE_OK ){
    rc = sqlite3IcuInit(db);
  }
#endif

#ifdef SQLITE_ENABLE_RTREE
  if( !db->mallocFailed && rc==SQLITE_OK){
    rc = sqlite3RtreeInit(db);
  }
#endif

#ifdef SQLITE_ENABLE_DBPAGE_VTAB
  if( !db->mallocFailed && rc==SQLITE_OK){
    rc = sqlite3DbpageRegister(db);
  }
#endif

#ifdef SQLITE_ENABLE_DBSTAT_VTAB
  if( !db->mallocFailed && rc==SQLITE_OK){
    rc = sqlite3DbstatRegister(db);
  }
#endif

#ifdef SQLITE_ENABLE_JSON1
  if( !db->mallocFailed && rc==SQLITE_OK){
    rc = sqlite3Json1Init(db);
  }
#endif

#ifdef SQLITE_ENABLE_STMTVTAB
  if( !db->mallocFailed && rc==SQLITE_OK){
    rc = sqlite3StmtVtabInit(db);
  }
#endif

#ifdef SQLITE_ENABLE_INTERNAL_FUNCTIONS
  /* Testing use only!!! The -DSQLITE_ENABLE_INTERNAL_FUNCTIONS=1 compile-time
  ** option gives access to internal functions by default.  
  ** Testing use only!!! */
  db->mDbFlags |= DBFLAG_InternalFunc;
#endif

................................................................................
#ifdef SQLITE_ENABLE_SQLLOG
  if( sqlite3GlobalConfig.xSqllog ){
    /* Opening a db handle. Fourth parameter is passed 0. */
    void *pArg = sqlite3GlobalConfig.pSqllogArg;
    sqlite3GlobalConfig.xSqllog(pArg, db, zFilename, 0);
  }
#endif
#if defined(SQLITE_HAS_CODEC)
  if( rc==SQLITE_OK ) sqlite3CodecQueryParameters(db, 0, zOpen);
#endif
  sqlite3_free(zOpen);
  return rc & 0xff;
}


/*
** Open a new database handle.
*/
................................................................................
  testcase( sqlite3GlobalConfig.xLog!=0 );
  return sqlite3ReportError(SQLITE_MISUSE, lineno, "misuse");
}
SQLITE_PRIVATE int sqlite3CantopenError(int lineno){
  testcase( sqlite3GlobalConfig.xLog!=0 );
  return sqlite3ReportError(SQLITE_CANTOPEN, lineno, "cannot open file");
}
#ifdef SQLITE_DEBUG
SQLITE_PRIVATE int sqlite3CorruptPgnoError(int lineno, Pgno pgno){
  char zMsg[100];
  sqlite3_snprintf(sizeof(zMsg), zMsg, "database corruption page %d", pgno);
  testcase( sqlite3GlobalConfig.xLog!=0 );
  return sqlite3ReportError(SQLITE_CORRUPT, lineno, zMsg);
}


SQLITE_PRIVATE int sqlite3NomemError(int lineno){
  testcase( sqlite3GlobalConfig.xLog!=0 );
  return sqlite3ReportError(SQLITE_NOMEM, lineno, "OOM");
}
SQLITE_PRIVATE int sqlite3IoerrnomemError(int lineno){
  testcase( sqlite3GlobalConfig.xLog!=0 );
  return sqlite3ReportError(SQLITE_IOERR_NOMEM, lineno, "I/O OOM error");
................................................................................
      *(sqlite3_vfs**)pArg = sqlite3PagerVfs(pPager);
      rc = SQLITE_OK;
    }else if( op==SQLITE_FCNTL_JOURNAL_POINTER ){
      *(sqlite3_file**)pArg = sqlite3PagerJrnlFile(pPager);
      rc = SQLITE_OK;
    }else if( op==SQLITE_FCNTL_DATA_VERSION ){
      *(unsigned int*)pArg = sqlite3PagerDataVersion(pPager);







      rc = SQLITE_OK;
    }else{
      rc = sqlite3OsFileControl(fd, op, pArg);
    }
    sqlite3BtreeLeave(pBtree);
  }
  sqlite3_mutex_leave(db->mutex);
................................................................................
    **  123410     little-endian, determined at compile-time
    */ 
    case SQLITE_TESTCTRL_BYTEORDER: {
      rc = SQLITE_BYTEORDER*100 + SQLITE_LITTLEENDIAN*10 + SQLITE_BIGENDIAN;
      break;
    }

    /*   sqlite3_test_control(SQLITE_TESTCTRL_RESERVE, sqlite3 *db, int N)
    **
    ** Set the nReserve size to N for the main database on the database
    ** connection db.
    */
    case SQLITE_TESTCTRL_RESERVE: {
      sqlite3 *db = va_arg(ap, sqlite3*);
      int x = va_arg(ap,int);
      sqlite3_mutex_enter(db->mutex);
      sqlite3BtreeSetPageSize(db->aDb[0].pBt, 0, x, 0);
      sqlite3_mutex_leave(db->mutex);
      break;
    }

    /*  sqlite3_test_control(SQLITE_TESTCTRL_OPTIMIZATIONS, sqlite3 *db, int N)
    **
    ** Enable or disable various optimizations for testing purposes.  The 
    ** argument N is a bitmask of optimizations to be disabled.  For normal
    ** operation N should be 0.  The idea is that a test program (like the
    ** SQL Logic Test or SLT test module) can run the same SQL multiple times
    ** with various optimizations disabled to verify that the same answer
................................................................................
      break;
    }
  }
  va_end(ap);
#endif /* SQLITE_UNTESTABLE */
  return rc;
}














































































/*
** This is a utility routine, useful to VFS implementations, that checks
** to see if a database file was a URI that contained a specific query 
** parameter, and if so obtains the value of the query parameter.
**
** The zFilename argument is the filename pointer passed into the xOpen()
................................................................................
** method of a VFS implementation.  The zParam argument is the name of the
** query parameter we seek.  This routine returns the value of the zParam
** parameter if it exists.  If the parameter does not exist, this routine
** returns a NULL pointer.
*/
SQLITE_API const char *sqlite3_uri_parameter(const char *zFilename, const char *zParam){
  if( zFilename==0 || zParam==0 ) return 0;
  zFilename += sqlite3Strlen30(zFilename) + 1;
  while( zFilename[0] ){
    int x = strcmp(zFilename, zParam);
    zFilename += sqlite3Strlen30(zFilename) + 1;
    if( x==0 ) return zFilename;
    zFilename += sqlite3Strlen30(zFilename) + 1;
  }
  return 0;
}

/*
** Return a pointer to the name of Nth query parameter of the filename.
*/
SQLITE_API const char *sqlite3_uri_key(const char *zFilename, int N){
  if( zFilename==0 || N<0 ) return 0;

  zFilename += sqlite3Strlen30(zFilename) + 1;
  while( zFilename[0] && (N--)>0 ){
    zFilename += sqlite3Strlen30(zFilename) + 1;
    zFilename += sqlite3Strlen30(zFilename) + 1;
  }
  return zFilename[0] ? zFilename : 0;
}
................................................................................
  sqlite3_int64 v;
  if( z && sqlite3DecOrHexToI64(z, &v)==0 ){
    bDflt = v;
  }
  return bDflt;
}

/*
** The Pager stores the Journal filename, WAL filename, and Database filename
** consecutively in memory, in that order, with prefixes \000\001\000,
** \002\000, and \003\000, in that order.  Thus the three names look like query
** parameters if you start at the first prefix.
**
** This routine backs up a filename to the start of the first prefix.
**
** This only works if the filenamed passed in was obtained from the Pager.
*/
static const char *startOfNameList(const char *zName){
  while( zName[0]!='\001' || zName[1]!=0 ){
    zName -= 3;
    while( zName[0]!='\000' ){ zName--; }
    zName++;
  }
  return zName-1;
}

/*
** Translate a filename that was handed to a VFS routine into the corresponding
** database, journal, or WAL file.
**
** It is an error to pass this routine a filename string that was not
** passed into the VFS from the SQLite core.  Doing so is similar to
** passing free() a pointer that was not obtained from malloc() - it is
** an error that we cannot easily detect but that will likely cause memory
** corruption.
*/
SQLITE_API const char *sqlite3_filename_database(const char *zFilename){
  return sqlite3_uri_parameter(zFilename - 3, "\003");
}
SQLITE_API const char *sqlite3_filename_journal(const char *zFilename){
  const char *z = sqlite3_uri_parameter(startOfNameList(zFilename), "\001");
  return ALWAYS(z) && z[0] ? z : 0;



}


SQLITE_API const char *sqlite3_filename_wal(const char *zFilename){
  return sqlite3_uri_parameter(startOfNameList(zFilename), "\002");







}

/*
** Return the Btree pointer identified by zDbName.  Return NULL if not found.
*/
SQLITE_PRIVATE Btree *sqlite3DbNameToBtree(sqlite3 *db, const char *zDbName){
  int iDb = zDbName ? sqlite3FindDbName(db, zDbName) : 0;
................................................................................
SQLITE_PRIVATE int sqlite3Fts3VarintLen(sqlite3_uint64);
SQLITE_PRIVATE void sqlite3Fts3Dequote(char *);
SQLITE_PRIVATE void sqlite3Fts3DoclistPrev(int,char*,int,char**,sqlite3_int64*,int*,u8*);
SQLITE_PRIVATE int sqlite3Fts3EvalPhraseStats(Fts3Cursor *, Fts3Expr *, u32 *);
SQLITE_PRIVATE int sqlite3Fts3FirstFilter(sqlite3_int64, char *, int, char *);
SQLITE_PRIVATE void sqlite3Fts3CreateStatTable(int*, Fts3Table*);
SQLITE_PRIVATE int sqlite3Fts3EvalTestDeferred(Fts3Cursor *pCsr, int *pRc);


/* fts3_tokenizer.c */
SQLITE_PRIVATE const char *sqlite3Fts3NextToken(const char *, int *);
SQLITE_PRIVATE int sqlite3Fts3InitHashTable(sqlite3 *, Fts3Hash *, const char *);
SQLITE_PRIVATE int sqlite3Fts3InitTokenizer(Fts3Hash *pHash, const char *, 
    sqlite3_tokenizer **, char **
);
................................................................................
  }
  if( p->zLanguageid ){
    fts3Appendf(pRc, &zRet, ", ?");
  }
  sqlite3_free(zFree);
  return zRet;
}

















/*
** This function interprets the string at (*pp) as a non-negative integer
** value. It reads the integer and sets *pnOut to the value read, then 
** sets *pp to point to the byte immediately following the last byte of
** the integer value.
**
................................................................................
** If *pp does not being with a decimal digit SQLITE_ERROR is returned and
** the output value undefined. Otherwise SQLITE_OK is returned.
**
** This function is used when parsing the "prefix=" FTS4 parameter.
*/
static int fts3GobbleInt(const char **pp, int *pnOut){
  const int MAX_NPREFIX = 10000000;
  const char *p;                  /* Iterator pointer */
  int nInt = 0;                   /* Output value */

  for(p=*pp; p[0]>='0' && p[0]<='9'; p++){
    nInt = nInt * 10 + (p[0] - '0');


    if( nInt>MAX_NPREFIX ){
      nInt = 0;
      break;
    }


  }
  if( p==*pp ) return SQLITE_ERROR;
  *pnOut = nInt;
  *pp = p;
  return SQLITE_OK;
}

/*
** This function is called to allocate an array of Fts3Index structures
** representing the indexes maintained by the current FTS table. FTS tables
** always maintain the main "terms" index, but may also maintain one or
................................................................................
  int rc = SQLITE_OK;             /* Return code */
  const char *zCsr = zNode;       /* Cursor to iterate through node */
  const char *zEnd = &zCsr[nNode];/* End of interior node buffer */
  char *zBuffer = 0;              /* Buffer to load terms into */
  i64 nAlloc = 0;                 /* Size of allocated buffer */
  int isFirstTerm = 1;            /* True when processing first term on page */
  sqlite3_int64 iChild;           /* Block id of child node to descend to */


  /* Skip over the 'height' varint that occurs at the start of every 
  ** interior node. Then load the blockid of the left-child of the b-tree
  ** node into variable iChild.  
  **
  ** Even if the data structure on disk is corrupted, this (reading two
  ** varints from the buffer) does not risk an overread. If zNode is a
................................................................................
    return FTS_CORRUPT_VTAB;
  }
  
  while( zCsr<zEnd && (piFirst || piLast) ){
    int cmp;                      /* memcmp() result */
    int nSuffix;                  /* Size of term suffix */
    int nPrefix = 0;              /* Size of term prefix */
    int nBuffer;                  /* Total term size */
  
    /* Load the next term on the node into zBuffer. Use realloc() to expand
    ** the size of zBuffer if required.  */
    if( !isFirstTerm ){
      zCsr += fts3GetVarint32(zCsr, &nPrefix);




    }
    isFirstTerm = 0;
    zCsr += fts3GetVarint32(zCsr, &nSuffix);
    
    assert( nPrefix>=0 && nSuffix>=0 );
    if( nPrefix>zCsr-zNode || nSuffix>zEnd-zCsr || nSuffix==0 ){
      rc = FTS_CORRUPT_VTAB;
................................................................................
** the next position.
*/
static void fts3ReadNextPos(
  char **pp,                    /* IN/OUT: Pointer into position-list buffer */
  sqlite3_int64 *pi             /* IN/OUT: Value read from position-list */
){
  if( (**pp)&0xFE ){
    fts3GetDeltaVarint(pp, pi);


    *pi -= 2;
  }else{
    *pi = POSITION_LIST_END;
  }
}

/*
................................................................................
            if( pLeft->pPhrase && pLeft->pPhrase->doclist.aAll ){
              Fts3Doclist *pDl = &pLeft->pPhrase->doclist;
              while( *pRc==SQLITE_OK && pLeft->bEof==0 ){
                memset(pDl->pList, 0, pDl->nList);
                fts3EvalNextRow(pCsr, pLeft, pRc);
              }
            }

          }
        }
        break;
      }
  
      case FTSQUERY_OR: {
        Fts3Expr *pLeft = pExpr->pLeft;
................................................................................
      int nKey = pKey->n;
      char cNext;

      /* If this is a "NEAR" keyword, check for an explicit nearness. */
      if( pKey->eType==FTSQUERY_NEAR ){
        assert( nKey==4 );
        if( zInput[4]=='/' && zInput[5]>='0' && zInput[5]<='9' ){
          nNear = 0;
          for(nKey=5; zInput[nKey]>='0' && zInput[nKey]<='9'; nKey++){
            nNear = nNear * 10 + (zInput[nKey] - '0');
          }
        }
      }

      /* At this point this is probably a keyword. But for that to be true,
      ** the next byte must contain either whitespace, an open or close
      ** parenthesis, a quote character, or EOF. 
      */
................................................................................
  if( idxNum==1 ){
    const char *zByte = (const char *)sqlite3_value_text(apVal[0]);
    int nByte = sqlite3_value_bytes(apVal[0]);
    pCsr->zInput = sqlite3_malloc64(nByte+1);
    if( pCsr->zInput==0 ){
      rc = SQLITE_NOMEM;
    }else{
      memcpy(pCsr->zInput, zByte, nByte);
      pCsr->zInput[nByte] = 0;
      rc = pTab->pMod->xOpen(pTab->pTok, pCsr->zInput, nByte, &pCsr->pCsr);
      if( rc==SQLITE_OK ){
        pCsr->pCsr->pTokenizer = pTab->pTok;
      }
    }
  }
................................................................................

  /* Check that the doclist does not appear to extend past the end of the
  ** b-tree node. And that the final byte of the doclist is 0x00. If either 
  ** of these statements is untrue, then the data structure is corrupt.
  */
  if( pReader->nDoclist > pReader->nNode-(pReader->aDoclist-pReader->aNode)
   || (pReader->nPopulate==0 && pReader->aDoclist[pReader->nDoclist-1])

  ){
    return FTS_CORRUPT_VTAB;
  }
  return SQLITE_OK;
}

/*
................................................................................
  ** (1024 is actually the value of macro FTS3_SEGDIR_PREFIXLEVEL_STR).
  */
  sqlite3_stmt *pStmt;
  int rc = fts3SqlStmt(p, SQL_SELECT_SEGDIR_MAX_LEVEL, &pStmt, 0);
  if( rc!=SQLITE_OK ) return rc;
  sqlite3_bind_int64(pStmt, 1, iAbsLevel+1);
  sqlite3_bind_int64(pStmt, 2, 
      ((iAbsLevel/FTS3_SEGDIR_MAXLEVEL)+1) * FTS3_SEGDIR_MAXLEVEL
  );

  *pbMax = 0;
  if( SQLITE_ROW==sqlite3_step(pStmt) ){
    *pbMax = sqlite3_column_type(pStmt, 0)==SQLITE_NULL;
  }
  return sqlite3_reset(pStmt);
................................................................................
  i64 *piEndBlock,
  i64 *pnByte
){
  const unsigned char *zText = sqlite3_column_text(pStmt, iCol);
  if( zText ){
    int i;
    int iMul = 1;
    i64 iVal = 0;
    for(i=0; zText[i]>='0' && zText[i]<='9'; i++){
      iVal = iVal*10 + (zText[i] - '0');
    }
    *piEndBlock = iVal;
    while( zText[i]==' ' ) i++;
    iVal = 0;
    if( zText[i]=='-' ){
      i++;
      iMul = -1;
    }
    for(/* no-op */; zText[i]>='0' && zText[i]<='9'; i++){
      iVal = iVal*10 + (zText[i] - '0');
    }
    *pnByte = (iVal * (i64)iMul);
  }
}


/*
** A segment of size nByte bytes has just been written to absolute level
** iAbsLevel. Promote any segments that should be promoted as a result.
................................................................................
      }
    }

    /* If nSeg is less that zero, then there is no level with at least
    ** nMin segments and no hint in the %_stat table. No work to do.
    ** Exit early in this case.  */
    if( nSeg<=0 ) break;







    /* Open a cursor to iterate through the contents of the oldest nSeg 
    ** indexes of absolute level iAbsLevel. If this cursor is opened using 
    ** the 'hint' parameters, it is possible that there are less than nSeg
    ** segments available in level iAbsLevel. In this case, no work is
    ** done on iAbsLevel - fall through to the next iteration of the loop 
    ** to start work on some other level.  */
................................................................................
  assert( p->flag==FTS3_MATCHINFO_LHITS_BM || p->flag==FTS3_MATCHINFO_LHITS );
  if( p->flag==FTS3_MATCHINFO_LHITS ){
    iStart = pExpr->iPhrase * p->nCol;
  }else{
    iStart = pExpr->iPhrase * ((p->nCol + 31) / 32);
  }

  while( 1 ){
    int nHit = fts3ColumnlistCount(&pIter);
    if( (pPhrase->iColumn>=pTab->nColumn || pPhrase->iColumn==iCol) ){
      if( p->flag==FTS3_MATCHINFO_LHITS ){
        p->aMatchinfo[iStart + iCol] = (u32)nHit;
      }else if( nHit ){
        p->aMatchinfo[iStart + (iCol+1)/32] |= (1 << (iCol&0x1F));
      }
................................................................................
  p->nAlloc = nTotal;
  return SQLITE_OK;
}

/* Append N bytes from zIn onto the end of the JsonString string.
*/
static void jsonAppendRaw(JsonString *p, const char *zIn, u32 N){

  if( (N+p->nUsed >= p->nAlloc) && jsonGrow(p,N)!=0 ) return;
  memcpy(p->zBuf+p->nUsed, zIn, N);
  p->nUsed += N;
}

/* Append formatted text (not to exceed N bytes) to the JsonString.
*/
................................................................................
    const char *zArg = argv[ii];
    if( zArg[0]=='+' ){
      pRtree->nAux++;
      sqlite3_str_appendf(pSql, ",%.*s", rtreeTokenLength(zArg+1), zArg+1);
    }else if( pRtree->nAux>0 ){
      break;
    }else{

      pRtree->nDim2++;

      sqlite3_str_appendf(pSql, ",%.*s NUM", rtreeTokenLength(zArg), zArg);
    }
  }
  sqlite3_str_appendf(pSql, ");");
  zSql = sqlite3_str_finish(pSql);
  if( !zSql ){
    rc = SQLITE_NOMEM;
  }else if( ii<argc ){
................................................................................
    /* There are now 4 possibilities:
    **
    **     1. uPattern is an unescaped match-all character "%",
    **     2. uPattern is an unescaped match-one character "_",
    **     3. uPattern is an unescaped escape character, or
    **     4. uPattern is to be handled as an ordinary character
    */
    if( !prevEscape && uPattern==MATCH_ALL ){
      /* Case 1. */
      uint8_t c;

      /* Skip any MATCH_ALL or MATCH_ONE characters that follow a
      ** MATCH_ALL. For each MATCH_ONE, skip one character in the 
      ** test string.
      */
................................................................................
        if( icuLikeCompare(zPattern, zString, uEsc) ){
          return 1;
        }
        SQLITE_ICU_SKIP_UTF8(zString);
      }
      return 0;

    }else if( !prevEscape && uPattern==MATCH_ONE ){
      /* Case 2. */
      if( *zString==0 ) return 0;
      SQLITE_ICU_SKIP_UTF8(zString);

    }else if( !prevEscape && uPattern==(uint32_t)uEsc){
      /* Case 3. */
      prevEscape = 1;

    }else{
      /* Case 4. */
      uint32_t uString;
      SQLITE_ICU_READ_UTF8(zString, uString);
................................................................................
        break;
      }
    }
  }
  i = 0;
  if( iSchema>=0 ){
    pIdxInfo->aConstraintUsage[iSchema].argvIndex = ++i;

    pIdxInfo->idxNum |= 0x01;
  }
  if( iName>=0 ){
    pIdxInfo->aConstraintUsage[iName].argvIndex = ++i;
    pIdxInfo->idxNum |= 0x02;
  }
  if( iAgg>=0 ){
................................................................................
        if( nLocal<0 ) goto statPageIsCorrupt;
        pCell->nLocal = nLocal;
        assert( nPayload>=(u32)nLocal );
        assert( nLocal<=(nUsable-35) );
        if( nPayload>(u32)nLocal ){
          int j;
          int nOvfl = ((nPayload - nLocal) + nUsable-4 - 1) / (nUsable - 4);

          if( iOff+nLocal>nUsable ) goto statPageIsCorrupt;

          pCell->nLastOvfl = (nPayload-nLocal) - (nOvfl-1) * (nUsable-4);
          pCell->nOvfl = nOvfl;
          pCell->aOvfl = sqlite3_malloc64(sizeof(u32)*nOvfl);
          if( pCell->aOvfl==0 ) return SQLITE_NOMEM_BKPT;
          pCell->aOvfl[0] = sqlite3Get4byte(&aData[iOff+nLocal]);
          for(j=1; j<nOvfl; j++){
            int rc;
................................................................................
){
  int i;
  const char *zSep = "";
  int rc = SQLITE_OK;
  SessionBuffer buf = {0, 0, 0};
  int nPk = 0;

  sessionAppendStr(&buf, "DELETE FROM ", &rc);
  sessionAppendIdent(&buf, zTab, &rc);
  sessionAppendStr(&buf, " WHERE ", &rc);

  for(i=0; i<p->nCol; i++){
    if( p->abPK[i] ){
      nPk++;
      sessionAppendStr(&buf, zSep, &rc);
................................................................................
){
  int rc = SQLITE_OK;
  int i;
  const char *zSep = "";
  SessionBuffer buf = {0, 0, 0};

  /* Append "UPDATE tbl SET " */
  sessionAppendStr(&buf, "UPDATE ", &rc);
  sessionAppendIdent(&buf, zTab, &rc);
  sessionAppendStr(&buf, " SET ", &rc);

  /* Append the assignments */
  for(i=0; i<p->nCol; i++){
    sessionAppendStr(&buf, zSep, &rc);
    sessionAppendIdent(&buf, p->azCol[i], &rc);
................................................................................

/*
** Check if buffer z[], size n bytes, contains as series of valid utf-8
** encoded codepoints. If so, return 0. Otherwise, if the buffer does not
** contain valid utf-8, return non-zero.
*/
static int fts5TestUtf8(const char *z, int n){
  assert_nc( n>0 );
  int i = 0;

  while( i<n ){
    if( (z[i] & 0x80)==0x00 ){
      i++;
    }else
    if( (z[i] & 0xE0)==0xC0 ){
      if( i+1>=n || (z[i+1] & 0xC0)!=0x80 ) return 1;
      i += 2;
................................................................................
static void fts5SourceIdFunc(
  sqlite3_context *pCtx,          /* Function call context */
  int nArg,                       /* Number of args */
  sqlite3_value **apUnused        /* Function arguments */
){
  assert( nArg==0 );
  UNUSED_PARAM2(nArg, apUnused);
  sqlite3_result_text(pCtx, "fts5: 2020-01-18 14:50:06 fee945671a19a93287f9bfadc346f9821fb1311c7fc75b95a6a48d1419c840e7", -1, SQLITE_TRANSIENT);
}

/*
** Return true if zName is the extension on one of the shadow tables used
** by this module.
*/
static int fts5ShadowName(const char *zName){
................................................................................
struct Fts5VocabTable {
  sqlite3_vtab base;
  char *zFts5Tbl;                 /* Name of fts5 table */
  char *zFts5Db;                  /* Db containing fts5 table */
  sqlite3 *db;                    /* Database handle */
  Fts5Global *pGlobal;            /* FTS5 global object for this database */
  int eType;                      /* FTS5_VOCAB_COL, ROW or INSTANCE */

};

struct Fts5VocabCursor {
  sqlite3_vtab_cursor base;
  sqlite3_stmt *pStmt;            /* Statement holding lock on pIndex */
  Fts5Table *pFts5;               /* Associated FTS5 table */

................................................................................
  Fts5VocabTable *pTab = (Fts5VocabTable*)pVTab;
  Fts5Table *pFts5 = 0;
  Fts5VocabCursor *pCsr = 0;
  int rc = SQLITE_OK;
  sqlite3_stmt *pStmt = 0;
  char *zSql = 0;







  zSql = sqlite3Fts5Mprintf(&rc,
      "SELECT t.%Q FROM %Q.%Q AS t WHERE t.%Q MATCH '*id'",
      pTab->zFts5Tbl, pTab->zFts5Db, pTab->zFts5Tbl, pTab->zFts5Tbl
  );
  if( zSql ){
    rc = sqlite3_prepare_v2(pTab->db, zSql, -1, &pStmt, 0);
  }
  sqlite3_free(zSql);
  assert( rc==SQLITE_OK || pStmt==0 );
  if( rc==SQLITE_ERROR ) rc = SQLITE_OK;


  if( pStmt && sqlite3_step(pStmt)==SQLITE_ROW ){
    i64 iId = sqlite3_column_int64(pStmt, 0);
    pFts5 = sqlite3Fts5TableFromCsrid(pTab->pGlobal, iId);
  }


  if( rc==SQLITE_OK ){
    if( pFts5==0 ){
      rc = sqlite3_finalize(pStmt);
      pStmt = 0;
      if( rc==SQLITE_OK ){
        pVTab->zErrMsg = sqlite3_mprintf(
................................................................................
      sqlite3_result_int(ctx, sqlite3_stmt_readonly(pCur->pStmt));
      break;
    }
    case STMT_COLUMN_BUSY: {
      sqlite3_result_int(ctx, sqlite3_stmt_busy(pCur->pStmt));
      break;
    }

    case STMT_COLUMN_MEM: {
      i = SQLITE_STMTSTATUS_MEMUSED + 
            STMT_COLUMN_NSCAN - SQLITE_STMTSTATUS_FULLSCAN_STEP;
      /* Fall thru */
    }
    case STMT_COLUMN_NSCAN:
    case STMT_COLUMN_NSORT:
    case STMT_COLUMN_NAIDX:
................................................................................
#endif
  return rc;
}
#endif /* SQLITE_CORE */
#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_STMTVTAB) */

/************** End of stmt.c ************************************************/
#if __LINE__!=228389
#undef SQLITE_SOURCE_ID
#define SQLITE_SOURCE_ID      "2020-01-18 14:50:06 fee945671a19a93287f9bfadc346f9821fb1311c7fc75b95a6a48d1419c8alt2"
#endif
/* Return the source-id for this library */
SQLITE_API const char *sqlite3_sourceid(void){ return SQLITE_SOURCE_ID; }
/************************** End of sqlite3.c ******************************/


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1
2
3
4
5
6
7
8
9
10
...
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
...
379
380
381
382
383
384
385



386
387
388
389
390
391
392
...
535
536
537
538
539
540
541



542
543
544
545
546
547
548
....
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
....
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356




1357
1358
1359
1360
1361
1362
1363
....
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
....
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130

2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
....
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
....
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
....
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587

4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
....
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
....
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
....
6117
6118
6119
6120
6121
6122
6123
6124
6125
6126
6127
6128
6129

6130
6131
6132
6133
6134
6135
6136
6137
6138
6139
6140
6141
6142
6143
6144
....
6256
6257
6258
6259
6260
6261
6262
6263
6264
6265
6266
6267
6268
6269
6270
6271
6272
6273
6274
6275
6276
6277
6278
6279
6280
6281
6282
6283
....
6530
6531
6532
6533
6534
6535
6536
6537
6538
6539
6540
6541
6542
6543
6544
....
6687
6688
6689
6690
6691
6692
6693
6694
6695
6696
6697
6698
6699
6700
6701
6702
6703
....
6756
6757
6758
6759
6760
6761
6762
6763
6764
6765
6766
6767
6768
6769
6770
6771
6772
6773
6774
6775
6776
6777
6778
6779
6780
6781
6782
6783
6784
6785
6786
6787
6788
....
6981
6982
6983
6984
6985
6986
6987













































6988
6989
6990
6991
6992
6993
6994
....
8723
8724
8725
8726
8727
8728
8729
8730
8731
8732
8733
8734
8735
8736
8737
.....
10129
10130
10131
10132
10133
10134
10135
10136
10137
10138
10139
10140
10141
10142
10143
10144
10145
10146
10147
10148
10149
10150
10151
10152
10153
10154
10155
10156
.....
13349
13350
13351
13352
13353
13354
13355
13356
13357
13358
13359
13360
13361
13362
13363
13364
13365
13366
13367
13368
.....
13443
13444
13445
13446
13447
13448
13449
13450
13451
13452
13453
13454
13455
13456
13457
13458
13459
13460
13461
13462
13463
13464
13465
13466
13467
13468
13469
13470
13471
.....
14535
14536
14537
14538
14539
14540
14541

14542
14543
14544
14545
14546
14547
14548
.....
14792
14793
14794
14795
14796
14797
14798
14799
14800
14801
14802
14803
14804
14805
14806
.....
15054
15055
15056
15057
15058
15059
15060

15061

15062
15063
15064
15065
15066
15067
15068
.....
15347
15348
15349
15350
15351
15352
15353
15354
15355
15356
15357
15358
15359
15360
15361
15362
.....
15414
15415
15416
15417
15418
15419
15420
15421
15422
15423
15424
15425
15426
15427
15428
15429
.....
15569
15570
15571
15572
15573
15574
15575
15576
15577
15578
15579
15580
15581
15582
15583
.....
15629
15630
15631
15632
15633
15634
15635
15636
15637
15638
15639
15640
15641
15642
15643
15644
15645
.....
15868
15869
15870
15871
15872
15873
15874



15875
15876
15877
15878
15879
15880
15881
.....
15917
15918
15919
15920
15921
15922
15923
15924
15925
15926
15927
15928
15929
15930
15931
15932
15933
15934
15935
15936
15937
15938
15939
15940
15941
15942
15943
15944
15945
.....
15958
15959
15960
15961
15962
15963
15964





15965
15966
15967
15968
15969
15970




15971
15972
15973
15974
15975
15976
15977
.....
16631
16632
16633
16634
16635
16636
16637

16638
16639
16640
16641
16642
16643
16644
.....
16788
16789
16790
16791
16792
16793
16794
16795
16796
16797
16798
16799
16800
16801
16802
.....
16891
16892
16893
16894
16895
16896
16897
16898
16899
16900
16901
16902
16903
16904
16905
.....
16998
16999
17000
17001
17002
17003
17004
17005
17006
17007
17008
17009
17010
17011
17012
.....
17117
17118
17119
17120
17121
17122
17123
17124
17125
17126
17127
17128
17129
17130
17131
.....
17138
17139
17140
17141
17142
17143
17144
17145
17146
17147
17148
17149
17150
17151
17152
.....
17303
17304
17305
17306
17307
17308
17309
17310
17311
17312
17313
17314
17315
17316
17317
.....
17523
17524
17525
17526
17527
17528
17529
17530
17531
17532
17533
17534
17535
17536
17537
17538
17539
17540
17541
.....
17885
17886
17887
17888
17889
17890
17891
17892
17893
17894
17895
17896
17897
17898
17899
17900
17901
17902
.....
17964
17965
17966
17967
17968
17969
17970
17971
17972
17973
17974
17975
17976
17977
17978
17979
17980
.....
18041
18042
18043
18044
18045
18046
18047
18048
18049
18050
18051
18052
18053
18054
18055
18056
18057
18058
18059
18060
18061
18062
18063
18064
18065
18066
18067
18068
18069
.....
18074
18075
18076
18077
18078
18079
18080
18081
18082
18083
18084
18085
18086
18087
18088
18089
18090
18091
18092
18093
18094
18095
18096
18097
18098
18099
18100
18101
18102
18103
18104
18105
.....
19065
19066
19067
19068
19069
19070
19071
19072
19073
19074
19075
19076
19077
19078
19079
.....
19222
19223
19224
19225
19226
19227
19228

19229
19230

19231
19232
19233
19234
19235
19236
19237
19238
19239
19240
19241
19242
19243
19244
19245
.....
19501
19502
19503
19504
19505
19506
19507



19508

19509
19510
19511
19512
19513
19514
19515
.....
19610
19611
19612
19613
19614
19615
19616
19617
19618
19619
19620
19621
19622
19623
19624
.....
19765
19766
19767
19768
19769
19770
19771
19772
19773
19774
19775
19776
19777
19778
19779
.....
19814
19815
19816
19817
19818
19819
19820
19821
19822
19823
19824
19825
19826
19827
19828
19829
19830
19831
19832
19833
19834
19835
19836
19837
19838
19839
19840
19841
19842
.....
19851
19852
19853
19854
19855
19856
19857
19858
19859
19860
19861
19862
19863
19864
19865
19866
19867
19868
.....
19921
19922
19923
19924
19925
19926
19927
19928
19929
19930
19931
19932
19933
19934
19935
19936
.....
19938
19939
19940
19941
19942
19943
19944
19945
19946
19947
19948
19949
19950
19951
19952
.....
20063
20064
20065
20066
20067
20068
20069
20070
20071
20072
20073
20074
20075
20076
20077
20078
20079
20080
.....
20089
20090
20091
20092
20093
20094
20095
20096
20097
20098
20099
20100
20101
20102
20103
20104
.....
20444
20445
20446
20447
20448
20449
20450



20451
20452



20453

20454
20455
20456
20457
20458
20459
20460
.....
20676
20677
20678
20679
20680
20681
20682
20683
20684
20685
20686
20687
20688
20689
20690
20691
.....
21064
21065
21066
21067
21068
21069
21070
21071
21072
21073

21074
21075
21076
21077
21078
21079
21080
.....
21142
21143
21144
21145
21146
21147
21148
21149
21150
21151
21152
21153
21154
21155
21156
21157
21158
21159
21160
21161
21162
21163
.....
21185
21186
21187
21188
21189
21190
21191
21192
21193
21194
21195
21196
21197
21198
21199
21200
21201
21202
21203
21204
21205
.....
22271
22272
22273
22274
22275
22276
22277
22278
22279
22280
22281
22282
22283
22284
22285
22286
22287
22288
22289
22290
.....
25836
25837
25838
25839
25840
25841
25842
25843
25844
25845
25846
25847
25848
25849
25850
.....
27364
27365
27366
27367
27368
27369
27370
27371
27372
27373
27374
27375
27376
27377
27378
.....
27432
27433
27434
27435
27436
27437
27438
27439
27440
27441
27442
27443
27444
27445
27446
.....
27496
27497
27498
27499
27500
27501
27502
27503
27504
27505
27506
27507
27508
27509
27510
27511
27512
27513
27514
27515
27516
27517
27518
27519
27520
.....
27735
27736
27737
27738
27739
27740
27741
27742
27743
27744
27745
27746
27747
27748
27749
27750
27751
27752
27753
27754
.....
27925
27926
27927
27928
27929
27930
27931
27932
27933
27934
27935
27936
27937
27938
27939
.....
28015
28016
28017
28018
28019
28020
28021
28022
28023
28024
28025
28026
28027
28028
28029
.....
28034
28035
28036
28037
28038
28039
28040
28041
28042
28043
28044
28045
28046
28047
28048
.....
29002
29003
29004
29005
29006
29007
29008
29009
29010
29011
29012
29013
29014
29015
29016
.....
29344
29345
29346
29347
29348
29349
29350
29351
29352
29353
29354
29355
29356
29357
29358
.....
29516
29517
29518
29519
29520
29521
29522
29523
29524
29525
29526
29527
29528
29529
29530
29531
.....
29776
29777
29778
29779
29780
29781
29782
29783
29784
29785
29786
29787
29788
29789
29790
29791
29792
29793
29794
29795
29796
29797
29798
29799
29800
29801
29802
29803
29804
29805
29806
29807
29808
29809
.....
29903
29904
29905
29906
29907
29908
29909
29910
29911
29912
29913
29914
29915
29916
29917
.....
30675
30676
30677
30678
30679
30680
30681




















30682
30683
30684
30685
30686
30687
30688
.....
30851
30852
30853
30854
30855
30856
30857
30858
30859
30860
30861
30862
30863
30864
30865
30866
30867
30868
30869
30870
30871
30872
30873
30874
30875
30876
30877
30878
30879
30880
30881
30882
30883
30884
30885
30886
30887
30888
30889
30890
30891
30892
30893
30894
30895
30896
30897
30898
30899
30900
30901
.....
31046
31047
31048
31049
31050
31051
31052
31053
31054
31055
31056




31057
31058
31059

31060
31061
31062
31063
31064
31065
31066
31067
31068
.....
31082
31083
31084
31085
31086
31087
31088
























31089
31090
31091
31092
31093
31094
31095
.....
31408
31409
31410
31411
31412
31413
31414
31415
31416
31417
31418
31419
31420
31421
31422
31423
31424
31425
31426
31427
31428
31429
31430
31431
31432
31433
31434
.....
32361
32362
32363
32364
32365
32366
32367
32368
32369
32370
32371
32372
32373
32374
32375
.....
32382
32383
32384
32385
32386
32387
32388
32389
32390
32391
32392
32393
32394
32395
32396
.....
33093
33094
33095
33096
33097
33098
33099
33100
33101
33102
33103
33104
33105
33106
33107
33108
.....
33160
33161
33162
33163
33164
33165
33166
33167
33168
33169
33170
33171
33172
33173
33174
33175
.....
34102
34103
34104
34105
34106
34107
34108
34109
34110
34111
34112
34113
34114
34115
34116
.....
34978
34979
34980
34981
34982
34983
34984
34985
34986
34987
34988
34989
34990
34991
34992
34993
34994
34995
34996
34997
34998
34999
35000
35001
35002
.....
37099
37100
37101
37102
37103
37104
37105
37106
37107
37108
37109
37110
37111
37112
37113
.....
37409
37410
37411
37412
37413
37414
37415
37416
37417
37418
37419
37420
37421
37422
37423
37424
37425
.....
37730
37731
37732
37733
37734
37735
37736
37737
37738
37739
37740
37741
37742
37743
37744
37745
37746
37747
37748
37749
37750
37751
37752
37753
37754
37755
37756
37757
.....
38239
38240
38241
38242
38243
38244
38245
38246
38247
38248
38249
38250
38251
38252
38253
38254
38255
38256
38257
38258
38259
38260
38261
38262
38263
38264
38265
38266
38267
38268
38269
38270
38271
.....
45049
45050
45051
45052
45053
45054
45055
45056
45057
45058
45059
45060
45061
45062
45063
.....
47028
47029
47030
47031
47032
47033
47034
47035
47036
47037
47038
47039
47040
47041
47042
47043
47044
47045
47046
47047
47048
47049
47050
47051
47052
.....
47104
47105
47106
47107
47108
47109
47110
47111
47112
47113
47114
47115
47116
47117
47118
47119
47120
47121
47122
.....
47864
47865
47866
47867
47868
47869
47870
47871
47872
47873
47874
47875
47876
47877
47878
.....
51080
51081
51082
51083
51084
51085
51086
51087
51088
51089
51090
51091
51092
51093
51094
.....
51356
51357
51358
51359
51360
51361
51362
51363
51364
51365
51366
51367
51368
51369
51370
.....
51577
51578
51579
51580
51581
51582
51583
51584
51585
51586
51587
51588
51589
51590
51591
51592
51593
51594
51595
.....
51973
51974
51975
51976
51977
51978
51979














51980
51981
51982
51983
51984
51985
51986
.....
52258
52259
52260
52261
52262
52263
52264






52265
52266
52267
52268
52269
52270
52271
.....
52384
52385
52386
52387
52388
52389
52390



52391
52392
52393
52394
52395
52396
52397
.....
52617
52618
52619
52620
52621
52622
52623
52624




52625
52626
52627
52628
52629
52630
52631
.....
53765
53766
53767
53768
53769
53770
53771





























53772
53773
53774
53775
53776
53777
53778
.....
53816
53817
53818
53819
53820
53821
53822





53823
53824
53825
53826
53827
53828
53829
.....
53878
53879
53880
53881
53882
53883
53884

53885
53886
53887
53888
53889
53890
53891
.....
53945
53946
53947
53948
53949
53950
53951







53952
53953
53954
53955
53956
53957







53958
53959
53960
53961
53962
53963
53964
.....
54001
54002
54003
54004
54005
54006
54007





54008
54009
54010
54011
54012
54013
54014
.....
54103
54104
54105
54106
54107
54108
54109
54110
54111
54112
54113
54114
54115
54116
54117
54118
54119
54120
54121
54122
.....
54563
54564
54565
54566
54567
54568
54569


54570
54571
54572
54573
54574
54575
54576
.....
55306
55307
55308
55309
55310
55311
55312

55313
55314
55315
55316
55317
55318
55319
.....
55701
55702
55703
55704
55705
55706
55707





55708
55709
55710
55711
55712
55713
55714
.....
55951
55952
55953
55954
55955
55956
55957
55958

55959
55960
55961
55962
55963
55964
55965
.....
56040
56041
56042
56043
56044
56045
56046






56047
56048
56049
56050
56051
56052
56053
.....
56312
56313
56314
56315
56316
56317
56318
56319



56320
56321
56322
56323
56324
56325
56326
56327
56328
56329
56330
56331
56332
56333
56334
56335
56336
56337
56338
56339
56340
56341
56342
56343
56344
56345
56346
56347
56348
56349
56350
56351
56352
56353
56354
56355
56356
56357
56358
56359
56360
56361
56362
56363
56364

56365
56366



56367
56368
56369
56370
56371
56372
56373
56374
56375
56376
56377
56378
56379
56380
56381
56382
56383
56384
56385
56386
56387
56388
56389
56390
56391
56392
56393
56394
56395

56396
56397
56398
56399
56400
56401
56402
56403
56404
56405

56406
56407
56408
56409

56410
56411
56412
56413
56414
56415
56416
56417
56418
56419

56420
56421
56422









56423
56424
56425
56426
56427
56428
56429
.....
56574
56575
56576
56577
56578
56579
56580
56581
56582
56583
56584
56585
56586
56587
56588
56589
56590
56591
56592
56593
56594
56595
56596
56597
56598
56599
56600
.....
57142
57143
57144
57145
57146
57147
57148



57149
57150
57151
57152
57153
57154
57155
.....
57272
57273
57274
57275
57276
57277
57278

57279
57280
57281
57282
57283
57284
57285
.....
57469
57470
57471
57472
57473
57474
57475
57476
57477
57478
57479
57480
57481
57482
57483
.....
57834
57835
57836
57837
57838
57839
57840
57841
57842
57843
57844
57845
57846
57847
57848
.....
58544
58545
58546
58547
58548
58549
58550
58551
58552
58553
58554
58555
58556
58557
58558
58559
.....
58564
58565
58566
58567
58568
58569
58570










58571
58572
58573
58574
58575
58576
58577
.....
58583
58584
58585
58586
58587
58588
58589
















































58590
58591
58592
58593
58594
58595
58596
.....
58977
58978
58979
58980
58981
58982
58983

58984
58985
58986
58987
58988
58989
58990
.....
59141
59142
59143
59144
59145
59146
59147
59148
59149
59150
59151
59152
59153
59154
59155
59156
59157
59158
59159
59160
59161
59162
59163
59164
59165
59166
59167
59168
59169
59170
59171
59172
59173
59174
59175
59176
59177
59178
59179
.....
59185
59186
59187
59188
59189
59190
59191
59192
59193
59194
59195
59196
59197
59198
59199
59200
59201
59202
.....
59524
59525
59526
59527
59528
59529
59530












59531
59532
59533
59534
59535
59536
59537
.....
59733
59734
59735
59736
59737
59738
59739
59740
59741
59742
59743
59744
59745
59746
59747
59748
59749
.....
59834
59835
59836
59837
59838
59839
59840
59841
59842
59843
59844
59845
59846
59847
59848
.....
60109
60110
60111
60112
60113
60114
60115
60116
60117
60118
60119
60120
60121
60122
60123
.....
60125
60126
60127
60128
60129
60130
60131
60132
60133
60134
60135
60136
60137
60138
60139
.....
60944
60945
60946
60947
60948
60949
60950
60951
60952
60953
60954
60955
60956
60957
60958
60959
60960
60961
60962
60963
60964
60965
60966
60967
60968
60969
60970
60971
60972
60973
60974
60975
60976
60977
60978
60979
60980
60981
60982
60983
60984
60985
60986
60987
60988
60989
60990
60991
60992
60993
60994
60995
60996
60997
60998
60999
61000
61001
61002
61003
61004
61005
61006
61007
61008
61009
61010
61011
61012
61013
61014
61015
61016
61017
61018
61019
61020
61021
61022
61023
61024
61025
61026
61027
61028
61029
61030
61031
61032
61033
61034
61035
61036
61037
61038
61039
61040
.....
61045
61046
61047
61048
61049
61050
61051
61052
61053
61054
61055
61056
61057
61058
61059
61060
61061
61062
61063
61064
.....
61088
61089
61090
61091
61092
61093
61094
61095
61096
61097
61098
61099
61100
61101
61102
.....
61221
61222
61223
61224
61225
61226
61227
61228
61229
61230
61231
61232
61233
61234
61235
61236
61237
61238
61239
61240
61241
61242
61243
61244
61245
61246
61247
.....
61249
61250
61251
61252
61253
61254
61255
61256
61257
61258
61259
61260
61261
61262
61263
61264
61265
61266
61267
61268




61269
61270
61271
61272
61273
61274
61275
61276
.....
61530
61531
61532
61533
61534
61535
61536

61537
61538
61539
61540
61541
61542
61543
61544
61545
61546
61547
61548
61549
61550
61551
61552
61553
61554
61555
61556
61557
61558
61559
61560
61561
61562
61563
61564
61565
61566
61567
61568
61569
.....
61885
61886
61887
61888
61889
61890
61891
61892
61893
61894
61895
61896
61897
61898
61899
.....
61947
61948
61949
61950
61951
61952
61953
61954
61955
61956
61957
61958
61959
61960
61961
61962
.....
62052
62053
62054
62055
62056
62057
62058
62059
62060
62061
62062
62063
62064
62065
62066
.....
62108
62109
62110
62111
62112
62113
62114
62115
62116
62117
62118
62119
62120
62121
62122
62123
62124
62125
62126
62127
62128
62129
62130
62131
62132
62133
62134
62135
62136
62137
62138
62139
62140
62141
62142
62143
62144
62145
62146
62147
.....
62166
62167
62168
62169
62170
62171
62172















62173
62174
62175
62176
62177
62178
62179
62180
62181
62182
62183
62184
62185
62186
62187
62188


62189
62190
62191
62192
62193
62194
62195
62196


62197
62198
62199
62200
62201
62202
62203
62204
62205
62206
62207
62208
62209
62210
62211
62212
62213
62214
62215
.....
62371
62372
62373
62374
62375
62376
62377
62378
62379
62380
62381
62382
62383
62384
62385
62386
62387
62388
62389
62390
62391
62392
62393
62394
.....
62627
62628
62629
62630
62631
62632
62633



62634

62635
62636
62637
62638
62639
62640
62641
.....
62810
62811
62812
62813
62814
62815
62816



62817

62818
62819
62820
62821
62822
62823
62824
.....
62957
62958
62959
62960
62961
62962
62963
62964
62965
62966
62967
62968
62969
62970
62971


62972
62973
62974
62975
62976
62977
62978
62979



62980
62981
62982
62983
62984
62985
62986
62987
62988
62989
62990
62991
62992
62993
62994
62995
62996
62997
62998
62999
63000
63001
63002
63003
63004
63005
63006
63007
63008
63009
63010
63011
63012
63013
63014
63015
63016
63017
.....
63034
63035
63036
63037
63038
63039
63040
63041
63042
63043
63044
63045
63046
63047
63048
63049
63050
63051
63052
63053
63054
63055
63056
63057
63058
63059
63060
63061
.....
63164
63165
63166
63167
63168
63169
63170
63171
63172
63173
63174
63175
63176
63177
63178
63179
63180
63181
.....
63686
63687
63688
63689
63690
63691
63692
63693


63694
63695
63696
63697
63698
63699
63700
.....
64887
64888
64889
64890
64891
64892
64893
64894
64895
64896
64897
64898
64899
64900
64901
.....
65725
65726
65727
65728
65729
65730
65731
65732
65733
65734
65735
65736
65737
65738
65739
.....
66056
66057
66058
66059
66060
66061
66062
66063
66064
66065
66066
66067
66068
66069
66070
.....
66580
66581
66582
66583
66584
66585
66586
66587

66588
66589
66590
66591
66592
66593
66594
.....
67131
67132
67133
67134
67135
67136
67137
67138
67139
67140
67141

67142
67143
67144
67145
67146
67147
67148



67149
67150
67151
67152
67153
67154
67155
.....
67187
67188
67189
67190
67191
67192
67193
67194
67195
67196
67197
67198
67199
67200
67201
67202



67203
67204
67205
67206
67207
67208
67209
67210
67211
.....
67647
67648
67649
67650
67651
67652
67653
67654
67655
67656
67657
67658
67659
67660
67661
.....
67663
67664
67665
67666
67667
67668
67669
67670
67671
67672
67673
67674
67675
67676
67677
.....
67711
67712
67713
67714
67715
67716
67717
67718
67719
67720
67721
67722
67723
67724
67725
67726
67727
67728
67729
67730
67731
67732
67733
67734
67735
67736
67737
67738
67739
67740
67741
67742
67743
67744
67745
67746
67747
67748
67749
67750
67751
67752
67753
67754
67755
67756
67757
67758
67759
67760
67761
67762
67763
67764
67765
67766
67767
67768
67769
67770
67771
.....
67809
67810
67811
67812
67813
67814
67815
67816
67817
67818
67819
67820
67821
67822
67823
.....
71445
71446
71447
71448
71449
71450
71451
71452
71453
71454
71455
71456
71457
71458
71459
.....
73802
73803
73804
73805
73806
73807
73808

73809
73810
73811
73812
73813
73814
73815
.....
73823
73824
73825
73826
73827
73828
73829
73830
73831
73832
73833
73834
73835
73836
73837
.....
73874
73875
73876
73877
73878
73879
73880

73881
73882
73883
73884
73885
73886
73887
.....
73948
73949
73950
73951
73952
73953
73954
73955
73956
73957
73958
73959
73960
73961
73962
.....
74924
74925
74926
74927
74928
74929
74930
74931
74932
74933
74934
74935
74936
74937
74938
.....
75047
75048
75049
75050
75051
75052
75053







75054
75055
75056
75057
75058
75059
75060
.....
75063
75064
75065
75066
75067
75068
75069




















75070
75071
75072
75073
75074
75075
75076
.....
75558
75559
75560
75561
75562
75563
75564




75565
75566
75567
75568
75569
75570
75571
.....
76547
76548
76549
76550
76551
76552
76553
76554
76555
76556
76557
76558
76559
76560
76561





76562
76563
76564
76565
76566
76567
76568
.....
76750
76751
76752
76753
76754
76755
76756
76757
76758
76759
76760
76761
76762
76763
76764
.....
76773
76774
76775
76776
76777
76778
76779
76780
76781

76782
76783
76784

76785
76786
76787
76788
76789
76790
76791
76792
76793
76794
76795
76796
76797

76798
76799
76800
76801
76802
76803
76804
76805
76806
76807
76808
.....
77909
77910
77911
77912
77913
77914
77915
77916
77917
77918
77919
77920
77921
77922
77923
.....
78550
78551
78552
78553
78554
78555
78556
78557
78558
78559
78560
78561
78562
78563
78564
78565
78566
78567
78568
78569
78570
78571
78572
78573
78574
78575
78576
78577
78578
78579
78580
78581
78582
78583
78584
78585
78586
78587
78588
78589
78590
78591
.....
78949
78950
78951
78952
78953
78954
78955
78956
78957
78958
78959


78960
78961
78962
78963
78964
78965
78966
78967
78968
78969
78970
78971
78972
78973
78974
78975
.....
78976
78977
78978
78979
78980
78981
78982
78983
78984
78985
78986
78987
78988
78989
78990
78991
78992
78993

78994
78995

78996
78997
78998
78999
79000
79001
79002
79003
79004
79005
79006
79007
79008
79009
79010
79011
79012
79013
79014
79015
79016
79017
79018
79019
79020
79021
79022
79023

79024
79025

79026
79027
79028
79029
79030

79031

79032
79033




79034

79035
79036
79037
79038
79039
79040
79041
79042
79043
79044
79045
79046
79047
.....
79114
79115
79116
79117
79118
79119
79120
79121
79122
79123

79124
79125
79126
79127
79128
79129
79130
79131
79132
.....
79144
79145
79146
79147
79148
79149
79150
79151
79152
79153
79154
79155
79156
79157
79158
79159
79160
79161
79162
.....
79202
79203
79204
79205
79206
79207
79208
79209
79210

79211
79212
79213
79214
79215
79216
79217
79218
79219

79220
79221
79222
79223
79224
79225
79226
79227



79228
79229
79230
79231
79232
79233
79234


79235
79236
79237
79238
79239
79240
79241
.....
79317
79318
79319
79320
79321
79322
79323
79324
79325
79326
79327
79328
79329
79330
79331

79332
79333
79334
79335
79336
79337
79338
79339
79340
79341
79342
79343
79344
79345
79346
79347
79348
79349
79350
79351
79352
79353
79354
.....
79431
79432
79433
79434
79435
79436
79437
79438
79439
79440
79441
79442
79443
79444
79445
79446
79447
79448
79449
79450
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79464
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79468
79469
79470
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79499
79500
79501
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79510
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79548
79549
79550
79551
79552
79553
79554
79555
79556
79557
79558
79559
.....
79586
79587
79588
79589
79590
79591
79592



79593
79594
79595
79596
79597
79598
79599
79600
79601
79602
79603
79604
79605
79606
79607
.....
79613
79614
79615
79616
79617
79618
79619








79620
79621
79622
79623
79624
79625
79626






















79627
























79628




79629





79630
79631
79632
79633





79634
79635
79636
79637
79638
79639
79640

79641
79642





79643
79644
79645
79646
79647
79648
79649
79650


79651


79652
79653
79654
79655
79656
79657
79658



79659
79660
79661

















79662







79663


79664
79665
79666
79667








79668
79669
79670



79671
79672






79673
79674
79675
79676
79677
79678
79679
79680
79681
79682
.....
79876
79877
79878
79879
79880
79881
79882
79883
79884
79885
79886
79887
79888
79889
79890
.....
79927
79928
79929
79930
79931
79932
79933

79934
79935
79936
79937
79938
79939
79940
.....
80238
80239
80240
80241
80242
80243
80244
80245
80246
80247
80248
80249
80250
80251
80252
80253
80254
.....
80270
80271
80272
80273
80274
80275
80276
80277
80278
80279
80280
80281
80282
80283
80284
.....
80293
80294
80295
80296
80297
80298
80299
80300
80301
80302
80303
80304
80305
80306
80307
80308
80309
80310
80311
80312
80313
80314
80315
80316
80317
80318
80319
80320
80321
.....
80330
80331
80332
80333
80334
80335
80336
80337
80338
80339
80340
80341
80342
80343
80344
80345
80346
80347
80348
80349
80350
80351
80352
80353
.....
81045
81046
81047
81048
81049
81050
81051
81052
81053
81054
81055
81056
81057
81058
81059
.....
82048
82049
82050
82051
82052
82053
82054
82055
82056
82057
82058
82059
82060
82061
82062
.....
82082
82083
82084
82085
82086
82087
82088
82089
82090
82091
82092
82093
82094
82095
82096
.....
82271
82272
82273
82274
82275
82276
82277
82278
82279
82280
82281
82282
82283
82284
82285
82286
82287
82288
.....
82395
82396
82397
82398
82399
82400
82401
82402
82403
82404
82405
82406
82407
82408
82409
82410
82411
82412
82413
82414
82415
82416
82417
82418
82419
82420
82421
82422
82423
82424
82425
82426
.....
82477
82478
82479
82480
82481
82482
82483
82484
82485
82486
82487
82488
82489
82490
82491
.....
83390
83391
83392
83393
83394
83395
83396
83397
83398
83399
83400
83401
83402
83403
83404
.....
84082
84083
84084
84085
84086
84087
84088
84089
84090
84091
84092
84093
84094
84095
84096
.....
85493
85494
85495
85496
85497
85498
85499
85500
85501
85502
85503
85504
85505
85506
85507
.....
85508
85509
85510
85511
85512
85513
85514
85515
85516
85517
85518
85519
85520
85521
85522
.....
85775
85776
85777
85778
85779
85780
85781
85782
85783
85784
85785
85786
85787
85788
85789
.....
85959
85960
85961
85962
85963
85964
85965
85966
85967
85968
85969
85970
85971
85972
85973
.....
86612
86613
86614
86615
86616
86617
86618

86619
86620
86621
86622
86623
86624
86625
.....
87142
87143
87144
87145
87146
87147
87148
87149
87150
87151
87152
87153
87154
87155
87156
.....
87165
87166
87167
87168
87169
87170
87171
87172
87173
87174
87175
87176
87177
87178
87179
.....
87780
87781
87782
87783
87784
87785
87786
87787
87788
87789
87790
87791
87792
87793
87794
.....
88255
88256
88257
88258
88259
88260
88261
88262
88263
88264
88265
88266
88267
88268
88269
88270
88271

88272
88273
88274
88275
88276
88277
88278
88279
88280
88281
88282
88283
88284
88285
88286
88287
88288
88289

88290
88291
88292
88293
88294
88295
88296
.....
88738
88739
88740
88741
88742
88743
88744
88745
88746
88747
88748
88749
88750
88751
88752
.....
88768
88769
88770
88771
88772
88773
88774
88775
88776
88777
88778
88779
88780
88781
88782
.....
88792
88793
88794
88795
88796
88797
88798
88799
88800
88801
88802
88803
88804
88805
88806
.....
88904
88905
88906
88907
88908
88909
88910

88911

88912
88913
88914
88915
88916
88917
88918
.....
89160
89161
89162
89163
89164
89165
89166
89167
89168
89169
89170
89171
89172
89173
89174
89175
89176
89177
89178
89179
89180
.....
89182
89183
89184
89185
89186
89187
89188
89189
89190
89191
89192
89193
89194
89195
89196
.....
89227
89228
89229
89230
89231
89232
89233
89234
89235
89236
89237
89238
89239
89240
89241
89242
89243
89244
89245
89246
89247
.....
89270
89271
89272
89273
89274
89275
89276
89277
89278
89279
89280
89281
89282
89283
89284
.....
89329
89330
89331
89332
89333
89334
89335
89336
89337
89338
89339
89340
89341
89342
89343
89344
89345
89346
89347
89348
89349
89350
89351
89352
89353
.....
90287
90288
90289
90290
90291
90292
90293
90294
90295
90296
90297
90298
90299
90300
90301
.....
90665
90666
90667
90668
90669
90670
90671








90672
90673
90674
90675
90676
90677
90678
90679
90680
90681
90682
90683
90684
90685
90686
90687



90688
90689
90690
90691
90692
90693
90694
90695
90696
90697
90698
90699
90700
90701
90702
90703
90704
90705
90706
90707
90708
90709
90710
90711
90712
90713
90714
90715
90716
90717
90718
90719
90720
90721
90722
90723
90724
90725
90726
90727
90728
90729
90730
90731
90732
90733
90734
90735
90736
90737
90738
90739
90740
90741
90742
90743
90744
90745
90746
.....
90749
90750
90751
90752
90753
90754
90755

90756
90757
90758
90759
90760
90761
90762
90763
90764
90765
90766
90767
90768
90769
90770
90771
90772
90773
90774
.....
91563
91564
91565
91566
91567
91568
91569
91570
91571
91572
91573
91574
91575
91576
91577
.....
92674
92675
92676
92677
92678
92679
92680
92681
92682
92683
92684
92685
92686
92687
92688
.....
92693
92694
92695
92696
92697
92698
92699
92700
92701
92702
92703
92704
92705
92706
92707
.....
93082
93083
93084
93085
93086
93087
93088
93089
93090
93091
93092
93093
93094
93095
93096
.....
94420
94421
94422
94423
94424
94425
94426
94427
94428
94429
94430
94431
94432
94433
94434
94435
.....
95378
95379
95380
95381
95382
95383
95384
95385
95386
95387
95388
95389
95390
95391
95392
.....
96365
96366
96367
96368
96369
96370
96371
96372
96373
96374
96375
96376
96377
96378
96379
96380
96381
96382
96383
96384
96385
96386
96387
96388
96389
96390
96391
96392
96393
96394
96395
96396
96397
96398
96399
96400
96401
96402
96403
96404
96405
96406
96407
96408
96409
96410
96411
96412
96413
96414
96415
96416
96417
96418
96419
96420
96421
96422
96423
96424
96425
96426
96427
96428
96429
96430
96431
96432
96433
96434
96435
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96475
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96478
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96499
96500
96501
96502
96503
96504
96505
96506
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96509
96510
96511
96512
96513
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96515
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96521
96522
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96526
96527
96528
96529
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96560
96561
96562
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96565
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96568
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96570
96571
96572
96573
96574
96575
96576
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96578
96579
96580
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96582
96583
96584
96585
96586
96587
96588
96589
96590
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96592
96593
96594
96595
96596
96597
96598
96599
96600
96601
96602
96603
96604
96605
96606
96607
96608
96609
96610
96611
96612
96613
96614
96615
96616
96617
96618
96619
96620
96621
96622
96623
96624
96625
96626
96627
96628
96629
96630
96631
96632
96633
96634
96635
96636
96637
96638
96639
96640
96641
96642
96643
96644
96645
96646
96647
96648
96649
96650
96651
96652
96653
96654
96655
96656
96657
96658
96659
96660
96661
96662
96663
96664
96665
96666
96667
96668
96669
96670
96671
96672
96673
96674
96675
96676
96677
96678
96679
96680
96681
96682
96683
96684
96685
96686
96687
96688
96689
96690
96691
96692
96693
96694
96695
96696
96697
96698
96699
96700
96701
96702
96703
96704
96705
96706
96707
96708
96709
96710
96711
96712
96713
96714
96715
96716
96717
96718
96719
96720
96721
96722
96723
96724
96725
96726
96727
96728
96729
96730
96731
96732
96733
96734
96735
96736
96737
96738
96739
96740
96741
96742
96743
96744
96745
96746
96747
96748
96749
96750
96751
96752
96753
96754
96755
96756
96757
96758
96759
96760
96761
96762
96763
96764
96765
96766
96767
96768
96769
96770
96771
96772
96773
96774
96775
96776
96777
96778
96779
96780
96781
96782
96783
96784
96785
96786
96787
96788
96789
96790
96791
96792
96793
96794
96795
96796
96797
96798
96799
96800
96801
96802
96803
96804
96805
.....
97383
97384
97385
97386
97387
97388
97389
97390
97391
97392
97393
97394
97395
97396
97397
97398
97399
97400
97401
97402
97403
97404
97405
97406
.....
97579
97580
97581
97582
97583
97584
97585
97586
97587
97588
97589
97590
97591
97592
97593
.....
97613
97614
97615
97616
97617
97618
97619
97620
97621
97622
97623
97624
97625
97626
97627
97628
97629
97630
97631
97632
97633
97634
97635
97636
97637
97638
97639
97640
97641
97642
97643
97644
97645
97646
97647
97648
97649
97650
97651
.....
97716
97717
97718
97719
97720
97721
97722
97723
97724
97725
97726
97727
97728
97729
97730
97731
97732
97733
97734
97735
97736
97737
97738
97739
97740
97741
97742
97743
97744
97745
97746
97747
.....
97767
97768
97769
97770
97771
97772
97773
97774
97775
97776
97777
97778
97779
97780
97781
97782
97783
.....
97830
97831
97832
97833
97834
97835
97836
97837
97838
97839
97840
97841
97842
97843
97844
97845
97846
97847
97848
.....
98044
98045
98046
98047
98048
98049
98050














98051

98052
98053
98054
98055
98056
98057
98058
.....
98326
98327
98328
98329
98330
98331
98332
98333
98334
98335

98336
98337
98338
98339

98340
98341
98342
98343
98344
98345
98346
98347
.....
98509
98510
98511
98512
98513
98514
98515
98516
98517
98518
98519
98520
98521
98522
98523
.....
98635
98636
98637
98638
98639
98640
98641
98642
98643
98644
98645
98646
98647
98648
98649
.....
99270
99271
99272
99273
99274
99275
99276
99277
99278
99279
99280
99281
99282
99283
99284
99285
99286
99287
99288
99289
99290
99291
99292
99293
99294
99295
99296
99297
99298
99299
99300
99301
99302
99303
99304
99305
99306
99307
99308
99309
99310
99311
99312
99313
99314
99315
99316
99317
99318
.....
99435
99436
99437
99438
99439
99440
99441
99442
99443
99444
99445
99446
99447
99448
99449
99450
99451
99452
.....
99505
99506
99507
99508
99509
99510
99511
99512
99513
99514
99515
99516
99517
99518
99519
.....
99524
99525
99526
99527
99528
99529
99530
99531
99532
99533
99534
99535
99536
99537
99538
.....
99545
99546
99547
99548
99549
99550
99551
99552
99553
99554
99555
99556
99557
99558
99559
99560
99561
99562
.....
99617
99618
99619
99620
99621
99622
99623
99624
99625
99626
99627
99628
99629
99630
99631
99632
99633
99634
99635
99636
99637
99638
99639
99640
99641
99642
99643
99644
99645
99646
99647
99648
99649
99650
99651
99652
.....
99660
99661
99662
99663
99664
99665
99666
99667
99668
99669
99670
99671
99672
99673
99674
.....
99683
99684
99685
99686
99687
99688
99689
99690
99691
99692
99693
99694
99695
99696
99697
.....
99698
99699
99700
99701
99702
99703
99704
99705
99706
99707
99708
99709
99710
99711
99712
99713
99714
99715
99716
.....
99722
99723
99724
99725
99726
99727
99728
99729
99730
99731
99732
99733
99734
99735
99736
99737
.....
99748
99749
99750
99751
99752
99753
99754
99755
99756
99757
99758
99759
99760
99761
99762
.....
99991
99992
99993
99994
99995
99996
99997
99998
99999
100000
100001
100002
100003
100004
100005
......
100604
100605
100606
100607
100608
100609
100610
100611
100612
100613
100614
100615
100616
100617
100618
......
100709
100710
100711
100712
100713
100714
100715
100716
100717
100718
100719
100720
100721
100722
100723
100724
100725
100726
......
101180
101181
101182
101183
101184
101185
101186
101187
101188
101189
101190
101191
101192
101193
101194
101195
101196
101197
101198
101199
101200
101201
101202
101203
101204
101205
101206
101207
101208
101209
......
101495
101496
101497
101498
101499
101500
101501
101502
101503
101504
101505
101506
101507
101508
101509
......
102258
102259
102260
102261
102262
102263
102264
102265
102266
102267
102268
102269
102270
102271
102272
......
102340
102341
102342
102343
102344
102345
102346
102347
102348
102349
102350
102351
102352
102353
102354
102355
......
102580
102581
102582
102583
102584
102585
102586
102587
102588
102589
102590
102591
102592
102593
102594
102595
102596
......
102625
102626
102627
102628
102629
102630
102631
102632
102633
102634
102635
102636
102637
102638
102639
102640
102641
102642
102643
102644
102645
102646
......
102658
102659
102660
102661
102662
102663
102664

102665
102666
102667
102668
102669

102670





102671

102672
102673
102674
102675
102676
102677
102678
......
102907
102908
102909
102910
102911
102912
102913
102914
102915
102916
102917
102918
102919
102920
102921
......
103047
103048
103049
103050
103051
103052
103053
103054
103055
103056
103057
103058
103059
103060
103061
103062
103063
103064
103065
103066
103067
103068
103069
103070
......
103089
103090
103091
103092
103093
103094
103095
103096


103097
103098
103099
103100
103101
103102
103103
103104
103105
103106
103107
103108
103109
103110
103111
103112
103113
......
103198
103199
103200
103201
103202
103203
103204
103205
103206
103207
103208
103209
103210
103211
103212
103213
103214
103215
103216
103217
103218
103219
103220
103221
103222
103223
103224
103225
103226
103227
103228
103229
103230
103231
103232
103233
......
103245
103246
103247
103248
103249
103250
103251




103252
103253
103254
103255
103256
103257
103258
......
103458
103459
103460
103461
103462
103463
103464
103465
103466
103467
103468
103469
103470
103471
103472
......
103530
103531
103532
103533
103534
103535
103536
103537
103538
103539
103540
103541
103542


103543

103544
103545
103546
103547
103548
103549
103550
......
103871
103872
103873
103874
103875
103876
103877
103878
103879
103880
103881
103882
103883
103884
103885
103886
103887
103888
103889
103890
103891
103892
103893
103894
103895
103896
103897
103898
103899
103900
103901
103902
103903
103904
103905
103906
103907
103908
103909
103910
103911
103912
103913
103914
103915
103916
103917
103918
103919
103920
103921
103922
103923
103924
103925
103926
103927
103928
103929
103930
103931
103932
103933
103934
103935
103936
103937
103938
103939
103940
103941
......
103945
103946
103947
103948
103949
103950
103951
103952
103953
103954
103955
103956
103957
103958
103959
103960
103961
103962
103963
103964
103965
103966
103967
103968
103969
103970
103971
103972
103973
103974
103975
103976
103977
103978
103979
103980
103981
......
103992
103993
103994
103995
103996
103997
103998
103999
104000
104001
104002
104003
104004
104005
104006
......
104014
104015
104016
104017
104018
104019
104020
104021
104022
104023
104024
104025
104026
104027
104028
......
104049
104050
104051
104052
104053
104054
104055
104056
104057
104058
104059
104060
104061
104062
104063
104064
104065
......
104109
104110
104111
104112
104113
104114
104115
104116
104117
104118
104119
104120
104121
104122
104123
......
104232
104233
104234
104235
104236
104237
104238
104239
104240
104241
104242
104243
104244
104245
104246
......
104374
104375
104376
104377
104378
104379
104380
104381
104382
104383
104384
104385
104386
104387
104388
......
104658
104659
104660
104661
104662
104663
104664
104665
104666
104667
104668
104669
104670
104671
104672
104673
104674
104675
104676














104677
104678
104679
104680
104681
104682
104683
......
104907
104908
104909
104910
104911
104912
104913
104914
104915
104916
104917
104918
104919
104920
104921
104922
104923
104924
104925
104926
104927
104928
104929
104930
104931
104932
104933
104934
104935
104936
104937
104938
104939
......
105522
105523
105524
105525
105526
105527
105528
105529
105530
105531
105532
105533
105534
105535
105536
105537
105538
105539
......
105656
105657
105658
105659
105660
105661
105662
105663
105664
105665
105666
105667
105668
105669
105670
105671
105672
105673
105674
105675
105676
105677
105678
105679
105680
105681
105682
105683
105684
105685
......
105725
105726
105727
105728
105729
105730
105731
105732
105733
105734
105735
105736
105737
105738
105739
105740
105741
105742
105743
105744
105745
105746
105747

105748
105749
105750
105751

105752
105753
105754
105755
105756
105757
105758
105759
105760
......
105761
105762
105763
105764
105765
105766
105767
105768
105769
105770
105771
105772
105773
105774

105775
105776
105777
105778
105779
105780
105781
......
105886
105887
105888
105889
105890
105891
105892
105893
105894
105895
105896
105897
105898
105899
105900
......
106115
106116
106117
106118
106119
106120
106121
106122
106123
106124
106125
106126
106127
106128
106129
......
106172
106173
106174
106175
106176
106177
106178
106179
106180
106181
106182
106183
106184
106185
106186
106187
106188
106189
106190
106191
106192
106193
106194
106195
106196
106197
106198
106199
106200
......
106209
106210
106211
106212
106213
106214
106215
106216
106217
106218
106219
106220
106221
106222
106223
......
106417
106418
106419
106420
106421
106422
106423
106424
106425
106426
106427
106428
106429
106430
106431
......
107330
107331
107332
107333
107334
107335
107336
107337
107338
107339
107340
107341
107342
107343
107344
107345
107346
107347
107348
107349
107350
107351
107352
107353
107354
107355

107356
107357
107358
107359
107360
107361
107362
107363
......
107365
107366
107367
107368
107369
107370
107371

107372
107373
107374
107375
107376
107377
107378
......
107383
107384
107385
107386
107387
107388
107389
107390
107391
107392
107393
107394
107395
107396
107397
......
107403
107404
107405
107406
107407
107408
107409
107410
107411
107412
107413
107414
107415
107416
107417
107418
107419
......
107420
107421
107422
107423
107424
107425
107426
107427
107428
107429
107430

107431
107432
107433
107434
107435
107436
107437
107438

107439
107440
107441
107442
107443
107444
107445
107446
107447
107448
107449
107450
107451
107452
107453
107454
107455
107456
107457
107458
107459
107460
107461
107462
107463
107464
107465
107466
107467
107468
107469
107470
107471
......
107473
107474
107475
107476
107477
107478
107479
107480
107481
107482
107483
107484
107485
107486
107487
107488
107489
107490
107491
107492
107493
107494
107495
107496
107497
107498
107499
107500
......
107502
107503
107504
107505
107506
107507
107508
107509
107510
107511
107512
107513
107514
107515
107516
107517
107518
107519
107520
107521
107522
107523
107524
107525
107526
107527
107528
107529
107530
107531
107532
107533
107534
107535


107536
107537
107538
107539
107540
107541
107542
107543
107544
107545
107546
107547
107548
107549
107550
107551
107552
107553
107554
107555
107556
107557
107558
107559
107560
107561
107562
107563
107564
107565
107566
107567
107568
107569
107570
107571
107572
107573
107574
107575
107576
107577
107578
107579
107580
107581

107582
107583
107584
107585
107586
107587
107588
107589
107590
107591
107592
107593
107594
107595
107596
107597
107598
107599
107600
107601
107602
107603
107604
107605

107606
107607
107608
107609
107610
107611
107612
107613
107614
107615
107616
107617
107618
......
107624
107625
107626
107627
107628
107629
107630
107631
107632
107633
107634
107635
107636
107637
107638
107639
107640
107641
......
107651
107652
107653
107654
107655
107656
107657
107658
107659
107660
107661
107662
107663
107664
107665
107666
107667
......
107675
107676
107677
107678
107679
107680
107681
107682
107683
107684
107685
107686
107687
107688
107689
107690
107691
......
107697
107698
107699
107700
107701
107702
107703
107704
107705
107706
107707
107708
107709
107710
107711
107712
107713
107714
107715
107716
107717
107718
107719
107720
107721
107722
107723
107724
107725
107726
107727
107728
107729
107730
107731
107732
107733
107734
......
107739
107740
107741
107742
107743
107744
107745
107746
107747
107748
107749
107750
107751
107752
107753
......
107782
107783
107784
107785
107786
107787
107788
107789
107790
107791
107792
107793
107794
107795
107796

107797
107798
107799
107800
107801
107802
107803
107804
107805
107806
107807
107808
107809
......
107819
107820
107821
107822
107823
107824
107825

107826
107827




107828
107829
107830
107831
107832
107833
107834
107835
107836
107837
107838
107839
107840
107841
107842
107843
107844
107845
107846
107847
107848
107849
107850
107851
107852
107853
107854
107855
107856
107857
107858
107859
107860
107861
107862
107863
107864
107865
107866
107867
107868
107869
107870
107871
107872
107873
107874
107875
107876
107877
107878
107879
107880
107881
107882
107883
107884
107885
107886
107887
107888
107889
107890
107891
107892
107893
107894
107895
107896
107897

107898


107899

107900
107901
107902
107903
107904
107905
107906
......
107908
107909
107910
107911
107912
107913
107914
107915
107916
107917
107918
107919
107920
107921
107922
107923
107924
107925
107926
107927
107928
107929
......
107937
107938
107939
107940
107941
107942
107943
107944
107945
107946
107947
107948
107949
107950
107951
107952
107953
107954
107955
107956
107957
107958
107959
107960
107961
107962
107963
107964
107965
107966
107967
107968
107969
107970
107971
107972
107973
107974
107975
107976
107977
107978
107979
107980
107981
107982
107983
107984
107985
107986
107987
107988
107989
107990
107991
107992
107993
107994
......
108003
108004
108005
108006
108007
108008
108009
108010
108011
108012
108013
108014
108015
108016
108017
108018
......
108024
108025
108026
108027
108028
108029
108030
108031
108032
108033
108034
108035
108036
108037
108038
......
108080
108081
108082
108083
108084
108085
108086
108087
108088
108089
108090
108091
108092
108093
108094
108095
108096
108097
108098
108099
108100
108101
108102
108103
......
108115
108116
108117
108118
108119
108120
108121
108122
108123

108124

108125
108126
108127
108128
108129
108130
108131
108132
108133
......
108247
108248
108249
108250
108251
108252
108253
108254



108255
108256
108257
108258
108259
108260
108261
108262
108263
108264
108265
108266
108267
108268
108269
108270
108271
108272

108273
108274
108275
108276
108277
108278
108279
108280
108281
108282
108283


108284
108285
108286
108287
108288
108289
108290
......
108309
108310
108311
108312
108313
108314
108315
108316
108317
108318
108319
108320
108321
108322
108323
......
108330
108331
108332
108333
108334
108335
108336
108337
108338
108339
108340
108341
108342
108343
108344
108345
108346
108347
108348
108349
108350
108351
108352
108353
108354
108355
108356
108357
108358
108359
108360
108361
108362

108363
108364
108365
108366
108367
108368
108369
108370
108371
108372
108373
108374
108375
108376
108377
108378
108379
108380
108381
108382
108383
108384
108385
108386
108387
108388
108389
108390
108391
108392
108393
108394
108395
108396
108397
108398
108399
108400
108401
108402
108403
108404
108405
108406
108407
108408
108409
108410
108411
108412
108413
108414
108415
108416
108417
108418
108419
108420
108421
108422
108423
108424
108425
108426
108427
108428
......
109107
109108
109109
109110
109111
109112
109113
109114
109115
109116
109117
109118
109119
109120
109121
109122
109123
109124
109125
109126
109127
109128
109129
109130
109131
......
109191
109192
109193
109194
109195
109196
109197
109198
109199

109200
109201
109202
109203
109204
109205
109206
......
109260
109261
109262
109263
109264
109265
109266




































109267
109268
109269
109270
109271
109272
109273
109274
......
109345
109346
109347
109348
109349
109350
109351
109352
109353
109354
109355
109356
109357
109358
109359
......
109536
109537
109538
109539
109540
109541
109542

109543
109544
109545
109546
109547

109548
109549
109550

109551
109552
109553
109554
109555
109556
109557
109558
109559
109560
109561
109562
109563
109564
......
110272
110273
110274
110275
110276
110277
110278
110279
110280

110281
110282
110283
110284
110285
110286
110287
110288
110289
110290
110291


110292
110293


110294
110295
110296
110297
110298
110299
110300
110301
110302
110303
110304
110305
110306
110307
110308
110309
110310
110311
110312
110313
110314
110315
110316
110317
110318
......
110414
110415
110416
110417
110418
110419
110420
110421
110422
110423
110424
110425
110426
110427
110428
......
110567
110568
110569
110570
110571
110572
110573
110574
110575
110576
110577
110578
110579
110580
110581
......
111216
111217
111218
111219
111220
111221
111222
111223
111224
111225
111226
111227
111228
111229
111230
......
112108
112109
112110
112111
112112
112113
112114
112115
112116
112117
112118
112119
112120
112121
112122
112123
112124
112125
112126
112127
112128
112129
112130
112131
112132
112133
112134
112135
112136
112137
112138
112139
112140
112141
112142
112143
112144
112145
112146
112147


112148
112149
112150
112151
112152
112153
112154
112155




112156
112157
112158
112159
112160
112161
112162
112163
112164
112165
112166
112167
112168
112169
112170
112171
112172
112173
112174
112175
112176
112177
112178
112179
112180
112181
112182
112183
112184
112185
112186
112187
112188
112189
112190
112191
......
112271
112272
112273
112274
112275
112276
112277
112278
112279
112280
112281
112282
112283
112284
112285
112286
......
114624
114625
114626
114627
114628
114629
114630
114631
114632
114633
114634
114635
114636
114637
114638
......
114735
114736
114737
114738
114739
114740
114741
114742
114743
114744
114745
114746
114747
114748
114749
......
115214
115215
115216
115217
115218
115219
115220
115221
115222
115223
115224
115225
115226
115227
115228



115229
115230
115231
115232
115233
115234
115235
115236
115237
115238
115239
115240
115241
115242
115243
115244
115245
115246
115247
115248
115249
115250
......
116123
116124
116125
116126
116127
116128
116129
116130
116131
116132
116133
116134
116135
116136
116137
116138
116139
......
116448
116449
116450
116451
116452
116453
116454
116455
116456
116457
116458
116459
116460
116461
116462
......
117412
117413
117414
117415
117416
117417
117418
117419
117420
117421
117422
117423
117424
117425
117426
......
117448
117449
117450
117451
117452
117453
117454
117455
117456
117457
117458
117459
117460
117461
117462
117463
117464
117465
117466
117467
......
117842
117843
117844
117845
117846
117847
117848
117849
117850
117851
117852
117853
117854
117855
117856
......
118430
118431
118432
118433
118434
118435
118436
118437
118438
118439
118440
118441
118442










118443
118444
118445
118446
118447
118448
118449
118450
118451
118452
118453
118454
118455
118456
118457
118458
118459
118460
118461
118462
118463
118464
118465
118466
118467
118468
118469
118470
118471
118472
......
118539
118540
118541
118542
118543
118544
118545
118546
118547
118548
118549
118550
118551
118552
118553
......
118579
118580
118581
118582
118583
118584
118585
118586
118587
118588
118589
118590
118591
118592
118593
118594
......
119268
119269
119270
119271
119272
119273
119274
119275
119276
119277
119278
119279
119280
119281
119282
......
121667
121668
121669
121670
121671
121672
121673
121674
121675
121676
121677
121678
121679
121680
121681
......
121722
121723
121724
121725
121726
121727
121728
121729
121730
121731
121732
121733
121734
121735
121736
121737
121738
121739
121740
121741
121742
121743
121744
121745
121746
121747
121748
121749
121750
121751
121752
121753
121754
121755
......
122240
122241
122242
122243
122244
122245
122246
122247
122248
122249
122250
122251
122252
122253
122254
122255
122256
122257
122258
122259
122260
122261
......
122855
122856
122857
122858
122859
122860
122861

122862
122863

122864
122865
122866
122867
122868
122869
122870
122871
122872
122873
122874
122875
......
122886
122887
122888
122889
122890
122891
122892

122893
122894
122895
122896
122897
122898
122899
......
122909
122910
122911
122912
122913
122914
122915

122916
122917
122918
122919
122920
122921
122922
122923
122924
122925
122926
......
123433
123434
123435
123436
123437
123438
123439
123440
123441
123442
123443
123444
123445
123446
123447
123448
123449
123450
123451
......
123728
123729
123730
123731
123732
123733
123734
123735
123736
123737
123738
123739
123740
123741
123742
123743
123744
123745
123746
123747
123748
123749
123750
123751
123752
123753
123754
123755
......
124220
124221
124222
124223
124224
124225
124226
124227
124228
124229
124230
124231
124232
124233
124234
124235
124236
124237
124238
124239
124240
124241
124242
124243
124244
124245
124246
......
124335
124336
124337
124338
124339
124340
124341
124342
124343
124344
124345
124346
124347
124348
124349
......
124638
124639
124640
124641
124642
124643
124644
124645
124646
124647
124648
124649
124650
124651
124652
124653
124654
124655
124656
124657
124658
124659
124660
124661
124662
124663
124664
124665
124666
124667
124668
124669
124670
124671
124672
124673
124674
124675
124676
124677
124678
124679
124680
124681
124682
124683
124684
124685
124686
124687


124688
124689
124690
124691
124692
124693
124694
......
124766
124767
124768
124769
124770
124771
124772
124773
124774
124775
124776
124777
124778
124779
124780
124781
124782
124783
124784
124785
124786
124787
124788
124789
124790
124791
......
124967
124968
124969
124970
124971
124972
124973












124974
124975
124976
124977
124978
124979
124980
......
125016
125017
125018
125019
125020
125021
125022







125023
125024
125025
125026
125027
125028
125029
......
125126
125127
125128
125129
125130
125131
125132









125133
125134
125135
125136
125137
125138
125139
......
125210
125211
125212
125213
125214
125215
125216












125217
125218
125219
125220
125221
125222
125223
......
125278
125279
125280
125281
125282
125283
125284
125285
125286
125287
125288
125289
125290
125291
125292
......
125808
125809
125810
125811
125812
125813
125814
125815
125816
125817
125818
125819
125820
125821
125822
......
126982
126983
126984
126985
126986
126987
126988

126989
126990
126991
126992
126993
126994
126995
126996
126997
126998
126999
127000
127001

127002
127003
127004
127005
127006
127007
127008
......
127075
127076
127077
127078
127079
127080
127081
127082










127083
127084

127085
127086
127087
127088
127089
127090
127091
127092
127093
127094
......
127428
127429
127430
127431
127432
127433
127434
127435
127436
127437
127438
127439
127440
127441
127442
127443
127444
127445
127446
127447
127448
127449
127450
127451
127452
127453
127454
127455
127456
127457
127458
127459
127460
......
127476
127477
127478
127479
127480
127481
127482









































127483
127484






127485
127486
127487

127488
127489
127490
127491
127492
127493
127494
......
127908
127909
127910
127911
127912
127913
127914
127915
127916
127917
127918
127919
127920
127921
127922
......
127996
127997
127998
127999
128000
128001
128002
128003
128004
128005
128006
128007
128008
128009
128010
......
128025
128026
128027
128028
128029
128030
128031
128032
128033
128034
128035
128036
128037
128038
128039
......
128085
128086
128087
128088
128089
128090
128091
128092

128093
128094
128095
128096
128097

128098
128099
128100
128101
128102
128103
128104
128105
128106
128107
128108
128109
128110


128111
128112
128113
128114
128115
128116
128117
......
128215
128216
128217
128218
128219
128220
128221
128222

128223
128224
128225
128226
128227
128228
128229
......
128851
128852
128853
128854
128855
128856
128857

128858
128859
128860
128861
128862
128863
128864
......
130771
130772
130773
130774
130775
130776
130777
130778
130779
130780
130781
130782
130783
130784
130785
......
131554
131555
131556
131557
131558
131559
131560
131561
131562
131563
131564
131565
131566
131567
131568
......
132225
132226
132227
132228
132229
132230
132231
132232
132233
132234
132235
132236
132237
132238
132239
132240
132241
132242
......
132246
132247
132248
132249
132250
132251
132252
132253
132254
132255
132256
132257
132258
132259
132260
......
132330
132331
132332
132333
132334
132335
132336
132337
132338
132339
132340
132341
132342
132343
132344
132345
132346
132347
132348
132349
132350
132351
132352
132353
132354
132355
132356
132357
132358
132359
132360
132361
132362
132363
132364
132365
132366
132367
132368
132369
132370
132371
132372
132373
132374
132375
......
132903
132904
132905
132906
132907
132908
132909
132910
132911
132912
132913
132914
132915
132916
132917
132918
132919
132920
132921
132922
......
132957
132958
132959
132960
132961
132962
132963
132964
132965

132966
132967
132968
132969
132970
132971
132972
......
132981
132982
132983
132984
132985
132986
132987



132988
132989
132990
132991
132992
132993
132994
......
133256
133257
133258
133259
133260
133261
133262
133263
133264
133265
133266
133267
133268
133269
133270
133271
133272
133273
133274
133275
133276
133277
133278
133279
133280
133281
133282
133283
......
133628
133629
133630
133631
133632
133633
133634
133635
133636
133637
133638
133639
133640
133641
133642
......
133759
133760
133761
133762
133763
133764
133765
133766
133767
133768
133769
133770
133771
133772
133773
133774
133775
133776
133777
133778
133779
133780
133781
133782
133783
133784
133785
133786
133787
133788
133789
133790
133791
133792
......
133937
133938
133939
133940
133941
133942
133943
133944
133945
133946
133947
133948
133949
133950
133951
......
134141
134142
134143
134144
134145
134146
134147
134148
134149
134150
134151
134152
134153
134154
134155
......
134283
134284
134285
134286
134287
134288
134289
134290
134291
134292
134293
134294
134295
134296
134297
......
135411
135412
135413
135414
135415
135416
135417

135418
135419
135420
135421
135422
135423
135424
......
135446
135447
135448
135449
135450
135451
135452
135453
135454
135455
135456
135457
135458
135459
135460
135461
135462
135463
135464
135465
135466
135467
135468
......
135470
135471
135472
135473
135474
135475
135476
135477


135478
135479
135480
135481
135482
135483
135484
......
135633
135634
135635
135636
135637
135638
135639
135640
135641
135642
135643
135644
135645
135646
135647
......
135742
135743
135744
135745
135746
135747
135748
135749
135750
135751
135752
135753
135754
135755
135756
......
136358
136359
136360
136361
136362
136363
136364
136365
136366
136367
136368
136369
136370
136371
136372
......
137032
137033
137034
137035
137036
137037
137038
137039
137040
137041
137042
137043
137044
137045
137046
137047
137048
137049
......
137052
137053
137054
137055
137056
137057
137058
137059
137060
137061
137062
137063
137064
137065
137066
......
137595
137596
137597
137598
137599
137600
137601
137602
137603
137604
137605
137606
137607
137608
137609
137610
137611
......
138550
138551
138552
138553
138554
138555
138556
138557











138558
138559
138560
138561
138562
138563
138564
......
138694
138695
138696
138697
138698
138699
138700
138701
138702
138703
138704
138705
138706
138707
138708
......
139901
139902
139903
139904
139905
139906
139907
139908
139909
139910
139911
139912
139913
139914
139915
......
140358
140359
140360
140361
140362
140363
140364
140365
140366
140367
140368
140369
140370
140371
140372
140373
140374
140375
140376
140377
......
140478
140479
140480
140481
140482
140483
140484
140485
140486
140487
140488
140489
140490
140491
140492
140493
140494
140495
140496
140497
140498
140499
140500
140501
......
142101
142102
142103
142104
142105
142106
142107
142108
142109
142110
142111
142112
142113
142114
142115
142116
142117
......
142380
142381
142382
142383
142384
142385
142386
142387
142388
142389
142390
142391
142392
142393
142394
142395
142396
......
143520
143521
143522
143523
143524
143525
143526
143527
143528
143529
143530
143531
143532
143533
143534
143535
......
143543
143544
143545
143546
143547
143548
143549
143550
143551
143552
143553
143554
143555
143556
143557
143558
......
143567
143568
143569
143570
143571
143572
143573
143574
143575
143576
143577
143578
143579
143580
143581
143582
143583
143584
143585
143586
......
147056
147057
147058
147059
147060
147061
147062
147063
147064
147065
147066
147067
147068
147069
147070
147071
147072
147073
147074
147075
147076
147077
147078
147079
147080
147081
147082
147083
147084
......
147252
147253
147254
147255
147256
147257
147258
147259
147260
147261
147262
147263
147264
147265
147266
147267
147268
......
147419
147420
147421
147422
147423
147424
147425
147426
147427
147428
147429
147430
147431
147432
147433
147434
147435
147436
147437
147438
147439
147440
147441
147442
147443
147444
147445
147446
147447
147448
147449
147450
147451
147452
147453
......
147516
147517
147518
147519
147520
147521
147522
147523
147524
147525
147526
147527
147528
147529
147530
......
147864
147865
147866
147867
147868
147869
147870
147871
147872
147873
147874
147875
147876
147877
147878
147879
147880
......
148537
148538
148539
148540
148541
148542
148543
148544
148545
148546
148547
148548
148549
148550
148551
148552
148553
148554
148555
......
149321
149322
149323
149324
149325
149326
149327
149328
149329
149330
149331
149332
149333
149334
149335
149336
149337
149338
149339
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......
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149660

149661
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149664






149665
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......
149936
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......
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150101
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......
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151199

151200
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......
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......
151327
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......
152216
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152222
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......
152595
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152600
152601
152602
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152610
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......
153436
153437
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......
157505
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157510
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157525
......
158783
158784
158785
158786
158787
158788
158789

158790
158791
158792
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158795
158796
158797
158798
158799
158800
158801
158802
158803
158804
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158806
158807
......
159391
159392
159393
159394
159395
159396
159397
159398
159399
159400
159401
159402
159403
159404
159405
......
159436
159437
159438
159439
159440
159441
159442
159443
159444
159445
159446
159447
159448
159449
159450
......
160103
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......
160302
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160309
160310
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......
160391
160392
160393
160394
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160396
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160398
160399
160400
160401
160402
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160405
......
161693
161694
161695
161696
161697
161698
161699
161700

161701
161702
161703
161704
161705
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161712
161713













161714
161715
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161717
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......
161726
161727
161728
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161732

161733
161734
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161739
......
161743
161744
161745
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161749
161750
161751
161752








161753

161754
161755
161756
161757
161758
161759
161760
......
161771
161772
161773
161774
161775
161776
161777

161778
161779
161780
161781
161782
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161784
......
161821
161822
161823
161824
161825
161826
161827

161828
161829
161830
161831
161832
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161834
......
161837
161838
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161840
161841
161842
161843
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161846
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161848
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......
162459
162460
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162462
162463
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......
162869
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......
162905
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......
163007
163008
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163010
163011
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163013
163014

163015
163016
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163018
163019
163020
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......
163087
163088
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163102
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163111
163112
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163119

163120
163121
163122


163123
163124
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163129
163130








163131









163132
163133
163134

163135
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163138
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163141
......
163146
163147
163148
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163160
......
163295
163296
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163300
163301
163302
163303
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163306
163307
163308
163309
163310
163311
......
163319
163320
163321
163322
163323
163324
163325





163326
163327
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163330
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163332
......
163340
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......
163363
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......
163390
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163397
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163399


163400
163401

163402
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163410
163411
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163413
























































163414
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......
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163460



163461
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......
163681
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......
163891
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......
164115
164116
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164119
164120
164121














164122
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......
164282
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164299
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164359
164360
164361
164362
164363
164364
164365
164366
164367
164368
164369
164370
164371
164372
......
164373
164374
164375
164376
164377
164378
164379
164380

164381





164382
164383
164384
164385
164386
164387
164388
164389
164390
164391
164392
164393
164394
164395
164396
......
164416
164417
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164422



















164423
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164445

164446
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164452
164453
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164455
164456
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164458
164459
......
166176
166177
166178
166179
166180
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166183
166184
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166187
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166190
......
166908
166909
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166937
......
166940
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166946

166947



166948
166949
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166952
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166956
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166963
166964
......
167845
167846
167847
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167851
167852
167853
167854
167855
167856
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167858
167859
......
167870
167871
167872
167873
167874
167875
167876

167877
167878
167879
167880
167881
167882
167883
167884
167885
167886
167887
167888
167889
167890
167891
167892
......
168132
168133
168134
168135
168136
168137
168138
168139
168140
168141
168142
168143
168144
168145
168146
168147
168148
......
171264
171265
171266
171267
171268
171269
171270
171271
171272
171273
171274
171275
171276
171277
171278
......
173035
173036
173037
173038
173039
173040
173041
173042



173043
173044
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173046
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173049
......
176041
176042
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176044
176045
176046
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176052
176053
176054
176055
......
177564
177565
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177567
177568
177569
177570
177571
177572
177573
177574
177575
177576
177577
177578
......
178652
178653
178654
178655
178656
178657
178658
178659
178660
178661
178662
178663
178664
178665
178666
......
179218
179219
179220
179221
179222
179223
179224
179225
179226
179227
179228
179229
179230
179231
179232
179233
179234
179235
179236
179237
179238
179239
179240
179241
179242
179243
179244
179245
179246
......
181102
181103
181104
181105
181106
181107
181108
181109
181110
181111
181112
181113
181114
181115
181116
181117
181118
181119
181120
181121
......
182810
182811
182812
182813
182814
182815
182816
182817
182818
182819
182820
182821
182822
182823
182824
......
184724
184725
184726
184727
184728
184729
184730
184731
184732
184733
184734
184735
184736
184737
184738
......
190845
190846
190847
190848
190849
190850
190851
190852
190853
190854
190855
190856
190857
190858
190859
190860
190861
190862
......
193584
193585
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193587
193588
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193592
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193598
......
193610
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193628
193629
......
200417
200418
200419
200420
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200427
200428
200429
200430
200431
......
200632
200633
200634
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200637
200638
200639
200640
200641
200642
200643
200644
200645
200646
200647
200648
......
204967
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204976
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......
205050
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205053
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205055
205056
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205059
205060
205061
205062
205063
205064
......
221096
221097
221098
221099
221100
221101
221102

221103
221104
221105
221106
221107
221108
221109
221110
221111
......
224736
224737
224738
224739
224740
224741
224742
224743
224744
224745
224746
224747
224748
224749
224750
......
228479
228480
228481
228482
228483
228484
228485
228486
228487
228488
228489
228490
228491
228492
228493
......
228762
228763
228764
228765
228766
228767
228768
228769
228770
228771
228772
228773
228774
228775
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228787
228788
228789
228790
228791
228792
228793
228794
228795
228796
228797
228798
......
229387
229388
229389
229390
229391
229392
229393
229394
229395
229396
229397
229398
229399
229400
229401
229402
......
229519
229520
229521
229522
229523
229524
229525
229526
229527
229528
229529
229530
229531
229532
/******************************************************************************
** This file is an amalgamation of many separate C source files from SQLite
** version 3.32.0.  By combining all the individual C code files into this
** single large file, the entire code can be compiled as a single translation
** unit.  This allows many compilers to do optimizations that would not be
** possible if the files were compiled separately.  Performance improvements
** of 5% or more are commonly seen when SQLite is compiled as a single
** translation unit.
**
** This file is all you need to compile SQLite.  To use SQLite in other
................................................................................
#endif
#if SQLITE_ENABLE_ATOMIC_WRITE
  "ENABLE_ATOMIC_WRITE",
#endif
#if SQLITE_ENABLE_BATCH_ATOMIC_WRITE
  "ENABLE_BATCH_ATOMIC_WRITE",
#endif
#if SQLITE_ENABLE_BYTECODE_VTAB
  "ENABLE_BYTECODE_VTAB",
#endif
#if SQLITE_ENABLE_CEROD
  "ENABLE_CEROD=" CTIMEOPT_VAL(SQLITE_ENABLE_CEROD),
#endif
#if SQLITE_ENABLE_COLUMN_METADATA
  "ENABLE_COLUMN_METADATA",
#endif
#if SQLITE_ENABLE_COLUMN_USED_MASK
................................................................................
#endif
#if SQLITE_FTS5_ENABLE_TEST_MI
  "FTS5_ENABLE_TEST_MI",
#endif
#if SQLITE_FTS5_NO_WITHOUT_ROWID
  "FTS5_NO_WITHOUT_ROWID",
#endif



#if HAVE_ISNAN || SQLITE_HAVE_ISNAN
  "HAVE_ISNAN",
#endif
#if SQLITE_HOMEGROWN_RECURSIVE_MUTEX
  "HOMEGROWN_RECURSIVE_MUTEX",
#endif
#if SQLITE_IGNORE_AFP_LOCK_ERRORS
................................................................................
#endif
#if SQLITE_OMIT_BETWEEN_OPTIMIZATION
  "OMIT_BETWEEN_OPTIMIZATION",
#endif
#if SQLITE_OMIT_BLOB_LITERAL
  "OMIT_BLOB_LITERAL",
#endif



#if SQLITE_OMIT_CAST
  "OMIT_CAST",
#endif
#if SQLITE_OMIT_CHECK
  "OMIT_CHECK",
#endif
#if SQLITE_OMIT_COMPLETE
................................................................................
** been edited in any way since it was last checked in, then the last
** four hexadecimal digits of the hash may be modified.
**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.32.0"
#define SQLITE_VERSION_NUMBER 3032000
#define SQLITE_SOURCE_ID      "2020-05-18 18:02:37 f64d054b799c0af8d582fd9aff9bcbfa380ef08026ba5db8c5f89f6f56dfdad9"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
................................................................................
**
** ^The sqlite3_close() and sqlite3_close_v2() routines are destructors
** for the [sqlite3] object.
** ^Calls to sqlite3_close() and sqlite3_close_v2() return [SQLITE_OK] if
** the [sqlite3] object is successfully destroyed and all associated
** resources are deallocated.
**
** Ideally, applications should [sqlite3_finalize | finalize] all
** [prepared statements], [sqlite3_blob_close | close] all [BLOB handles], and 
** [sqlite3_backup_finish | finish] all [sqlite3_backup] objects associated
** with the [sqlite3] object prior to attempting to close the object.
** ^If the database connection is associated with unfinalized prepared
** statements, BLOB handlers, and/or unfinished sqlite3_backup objects then
** sqlite3_close() will leave the database connection open and return
** [SQLITE_BUSY]. ^If sqlite3_close_v2() is called with unfinalized prepared
** statements, unclosed BLOB handlers, and/or unfinished sqlite3_backups,
** it returns [SQLITE_OK] regardless, but instead of deallocating the database
** connection immediately, it marks the database connection as an unusable
** "zombie" and makes arrangements to automatically deallocate the database
** connection after all prepared statements are finalized, all BLOB handles
** are closed, and all backups have finished. The sqlite3_close_v2() interface
** is intended for use with host languages that are garbage collected, and
** where the order in which destructors are called is arbitrary.




**
** ^If an [sqlite3] object is destroyed while a transaction is open,
** the transaction is automatically rolled back.
**
** The C parameter to [sqlite3_close(C)] and [sqlite3_close_v2(C)]
** must be either a NULL
** pointer or an [sqlite3] object pointer obtained
................................................................................
#define SQLITE_IOERR_GETTEMPPATH       (SQLITE_IOERR | (25<<8))
#define SQLITE_IOERR_CONVPATH          (SQLITE_IOERR | (26<<8))
#define SQLITE_IOERR_VNODE             (SQLITE_IOERR | (27<<8))
#define SQLITE_IOERR_AUTH              (SQLITE_IOERR | (28<<8))
#define SQLITE_IOERR_BEGIN_ATOMIC      (SQLITE_IOERR | (29<<8))
#define SQLITE_IOERR_COMMIT_ATOMIC     (SQLITE_IOERR | (30<<8))
#define SQLITE_IOERR_ROLLBACK_ATOMIC   (SQLITE_IOERR | (31<<8))
#define SQLITE_IOERR_DATA              (SQLITE_IOERR | (32<<8))
#define SQLITE_LOCKED_SHAREDCACHE      (SQLITE_LOCKED |  (1<<8))
#define SQLITE_LOCKED_VTAB             (SQLITE_LOCKED |  (2<<8))
#define SQLITE_BUSY_RECOVERY           (SQLITE_BUSY   |  (1<<8))
#define SQLITE_BUSY_SNAPSHOT           (SQLITE_BUSY   |  (2<<8))
#define SQLITE_BUSY_TIMEOUT            (SQLITE_BUSY   |  (3<<8))
#define SQLITE_CANTOPEN_NOTEMPDIR      (SQLITE_CANTOPEN | (1<<8))
#define SQLITE_CANTOPEN_ISDIR          (SQLITE_CANTOPEN | (2<<8))
#define SQLITE_CANTOPEN_FULLPATH       (SQLITE_CANTOPEN | (3<<8))
#define SQLITE_CANTOPEN_CONVPATH       (SQLITE_CANTOPEN | (4<<8))
#define SQLITE_CANTOPEN_DIRTYWAL       (SQLITE_CANTOPEN | (5<<8)) /* Not Used */
#define SQLITE_CANTOPEN_SYMLINK        (SQLITE_CANTOPEN | (6<<8))
#define SQLITE_CORRUPT_VTAB            (SQLITE_CORRUPT | (1<<8))
#define SQLITE_CORRUPT_SEQUENCE        (SQLITE_CORRUPT | (2<<8))
#define SQLITE_CORRUPT_INDEX           (SQLITE_CORRUPT | (3<<8))
#define SQLITE_READONLY_RECOVERY       (SQLITE_READONLY | (1<<8))
#define SQLITE_READONLY_CANTLOCK       (SQLITE_READONLY | (2<<8))
#define SQLITE_READONLY_ROLLBACK       (SQLITE_READONLY | (3<<8))
#define SQLITE_READONLY_DBMOVED        (SQLITE_READONLY | (4<<8))
#define SQLITE_READONLY_CANTINIT       (SQLITE_READONLY | (5<<8))
#define SQLITE_READONLY_DIRECTORY      (SQLITE_READONLY | (6<<8))
#define SQLITE_ABORT_ROLLBACK          (SQLITE_ABORT | (2<<8))
................................................................................
** [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] to be rolled back.
** ^This file control takes the file descriptor out of batch write mode
** so that all subsequent write operations are independent.
** ^SQLite will never invoke SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE without
** a prior successful call to [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE].
**
** <li>[[SQLITE_FCNTL_LOCK_TIMEOUT]]
** The [SQLITE_FCNTL_LOCK_TIMEOUT] opcode is used to configure a VFS
** to block for up to M milliseconds before failing when attempting to 
** obtain a file lock using the xLock or xShmLock methods of the VFS. 

** The parameter is a pointer to a 32-bit signed integer that contains
** the value that M is to be set to. Before returning, the 32-bit signed
** integer is overwritten with the previous value of M.
**
** <li>[[SQLITE_FCNTL_DATA_VERSION]]
** The [SQLITE_FCNTL_DATA_VERSION] opcode is used to detect changes to
** a database file.  The argument is a pointer to a 32-bit unsigned integer.
** The "data version" for the pager is written into the pointer.  The
** "data version" changes whenever any change occurs to the corresponding
** database file, either through SQL statements on the same database
................................................................................
** omits changes made by other database connections.  The
** [PRAGMA data_version] command provides a mechanism to detect changes to
** a single attached database that occur due to other database connections,
** but omits changes implemented by the database connection on which it is
** called.  This file control is the only mechanism to detect changes that
** happen either internally or externally and that are associated with
** a particular attached database.
**
** <li>[[SQLITE_FCNTL_CKPT_START]]
** The [SQLITE_FCNTL_CKPT_START] opcode is invoked from within a checkpoint
** in wal mode before the client starts to copy pages from the wal
** file to the database file.
**
** <li>[[SQLITE_FCNTL_CKPT_DONE]]
** The [SQLITE_FCNTL_CKPT_DONE] opcode is invoked from within a checkpoint
** in wal mode after the client has finished copying pages from the wal
** file to the database file, but before the *-shm file is updated to
** record the fact that the pages have been checkpointed.
** </ul>
................................................................................
#define SQLITE_FCNTL_BEGIN_ATOMIC_WRITE     31
#define SQLITE_FCNTL_COMMIT_ATOMIC_WRITE    32
#define SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE  33
#define SQLITE_FCNTL_LOCK_TIMEOUT           34
#define SQLITE_FCNTL_DATA_VERSION           35
#define SQLITE_FCNTL_SIZE_LIMIT             36
#define SQLITE_FCNTL_CKPT_DONE              37
#define SQLITE_FCNTL_RESERVE_BYTES          38
#define SQLITE_FCNTL_CKPT_START             39

/* deprecated names */
#define SQLITE_GET_LOCKPROXYFILE      SQLITE_FCNTL_GET_LOCKPROXYFILE
#define SQLITE_SET_LOCKPROXYFILE      SQLITE_FCNTL_SET_LOCKPROXYFILE
#define SQLITE_LAST_ERRNO             SQLITE_FCNTL_LAST_ERRNO


................................................................................
/*
** CAPI3REF: Obtain Values For URI Parameters
**
** These are utility routines, useful to [VFS|custom VFS implementations],
** that check if a database file was a URI that contained a specific query 
** parameter, and if so obtains the value of that query parameter.
**
** The first parameter to these interfaces (hereafter referred to
** as F) must be one of:
** <ul>
** <li> A database filename pointer created by the SQLite core and
** passed into the xOpen() method of a VFS implemention, or

** <li> A filename obtained from [sqlite3_db_filename()], or
** <li> A new filename constructed using [sqlite3_create_filename()].
** </ul>
** If the F parameter is not one of the above, then the behavior is
** undefined and probably undesirable.  Older versions of SQLite were
** more tolerant of invalid F parameters than newer versions.
**
** If F is a suitable filename (as described in the previous paragraph)
** and if P is the name of the query parameter, then
** sqlite3_uri_parameter(F,P) returns the value of the P
** parameter if it exists or a NULL pointer if P does not appear as a 
** query parameter on F.  If P is a query parameter of F and it
** has no explicit value, then sqlite3_uri_parameter(F,P) returns
** a pointer to an empty string.
**
................................................................................
** return value from [sqlite3_db_filename()], then the result is
** undefined and is likely a memory access violation.
*/
SQLITE_API const char *sqlite3_filename_database(const char*);
SQLITE_API const char *sqlite3_filename_journal(const char*);
SQLITE_API const char *sqlite3_filename_wal(const char*);

/*
** CAPI3REF:  Database File Corresponding To A Journal
**
** ^If X is the name of a rollback or WAL-mode journal file that is
** passed into the xOpen method of [sqlite3_vfs], then 
** sqlite3_database_file_object(X) returns a pointer to the [sqlite3_file]
** object that represents the main database file.
**
** This routine is intended for use in custom [VFS] implementations
** only.  It is not a general-purpose interface.
** The argument sqlite3_file_object(X) must be a filename pointer that
** has been passed into [sqlite3_vfs].xOpen method where the 
** flags parameter to xOpen contains one of the bits
** [SQLITE_OPEN_MAIN_JOURNAL] or [SQLITE_OPEN_WAL].  Any other use
** of this routine results in undefined and probably undesirable
** behavior.
*/
SQLITE_API sqlite3_file *sqlite3_database_file_object(const char*);

/*
** CAPI3REF: Create and Destroy VFS Filenames
**
** These interfces are provided for use by [VFS shim] implementations and
** are not useful outside of that context.
**
** The sqlite3_create_filename(D,J,W,N,P) allocates memory to hold a version of
** database filename D with corresponding journal file J and WAL file W and
** with N URI parameters key/values pairs in the array P.  The result from
** sqlite3_create_filename(D,J,W,N,P) is a pointer to a database filename that
** is safe to pass to routines like:
** <ul>
** <li> [sqlite3_uri_parameter()],
** <li> [sqlite3_uri_boolean()],
** <li> [sqlite3_uri_int64()],
** <li> [sqlite3_uri_key()], 
** <li> [sqlite3_filename_database()],
** <li> [sqlite3_filename_journal()], or
** <li> [sqlite3_filename_wal()].
** </ul>
** If a memory allocation error occurs, sqlite3_create_filename() might
** return a NULL pointer.  The memory obtained from sqlite3_create_filename(X)
** must be released by a corresponding call to sqlite3_free_filename(Y).
**
** The P parameter in sqlite3_create_filename(D,J,W,N,P) should be an array
** of 2*N pointers to strings.  Each pair of pointers in this array corresponds
** to a key and value for a query parameter.  The P parameter may be a NULL
** pointer if N is zero.  None of the 2*N pointers in the P array may be
** NULL pointers and key pointers should not be empty strings.
** None of the D, J, or W parameters to sqlite3_create_filename(D,J,W,N,P) may
** be NULL pointers, though they can be empty strings.
**
** The sqlite3_free_filename(Y) routine releases a memory allocation
** previously obtained from sqlite3_create_filename().  Invoking
** sqlite3_free_filename(Y) where Y is a NULL pointer is a harmless no-op.
**
** If the Y parameter to sqlite3_free_filename(Y) is anything other
** than a NULL pointer or a pointer previously acquired from
** sqlite3_create_filename(), then bad things such as heap
** corruption or segfaults may occur. The value Y should be 
** used again after sqlite3_free_filename(Y) has been called.  This means
** that if the [sqlite3_vfs.xOpen()] method of a VFS has been called using Y,
** then the corresponding [sqlite3_module.xClose() method should also be
** invoked prior to calling sqlite3_free_filename(Y).
*/
SQLITE_API char *sqlite3_create_filename(
  const char *zDatabase,
  const char *zJournal,
  const char *zWal,
  int nParam,
  const char **azParam
);
SQLITE_API void sqlite3_free_filename(char*);

/*
** CAPI3REF: Error Codes And Messages
** METHOD: sqlite3
**
** ^If the most recent sqlite3_* API call associated with 
** [database connection] D failed, then the sqlite3_errcode(D) interface
................................................................................
** ^The leftmost SQL parameter has an index of 1.  ^When the same named
** SQL parameter is used more than once, second and subsequent
** occurrences have the same index as the first occurrence.
** ^The index for named parameters can be looked up using the
** [sqlite3_bind_parameter_index()] API if desired.  ^The index
** for "?NNN" parameters is the value of NNN.
** ^The NNN value must be between 1 and the [sqlite3_limit()]
** parameter [SQLITE_LIMIT_VARIABLE_NUMBER] (default value: 32766).
**
** ^The third argument is the value to bind to the parameter.
** ^If the third parameter to sqlite3_bind_text() or sqlite3_bind_text16()
** or sqlite3_bind_blob() is a NULL pointer then the fourth parameter
** is ignored and the end result is the same as sqlite3_bind_null().
** ^If the third parameter to sqlite3_bind_text() is not NULL, then
** it should be a pointer to well-formed UTF8 text.
** ^If the third parameter to sqlite3_bind_text16() is not NULL, then
** it should be a pointer to well-formed UTF16 text.
** ^If the third parameter to sqlite3_bind_text64() is not NULL, then
** it should be a pointer to a well-formed unicode string that is
** either UTF8 if the sixth parameter is SQLITE_UTF8, or UTF16
** otherwise.
**
** [[byte-order determination rules]] ^The byte-order of
** UTF16 input text is determined by the byte-order mark (BOM, U+FEFF)
** found in first character, which is removed, or in the absence of a BOM
** the byte order is the native byte order of the host
** machine for sqlite3_bind_text16() or the byte order specified in
** the 6th parameter for sqlite3_bind_text64().)^ 
** ^If UTF16 input text contains invalid unicode
** characters, then SQLite might change those invalid characters
** into the unicode replacement character: U+FFFD.
**
** ^(In those routines that have a fourth argument, its value is the
** number of bytes in the parameter.  To be clear: the value is the
** number of <u>bytes</u> in the value, not the number of characters.)^
** ^If the fourth parameter to sqlite3_bind_text() or sqlite3_bind_text16()
** is negative, then the length of the string is
** the number of bytes up to the first zero terminator.
** If the fourth parameter to sqlite3_bind_blob() is negative, then
** the behavior is undefined.
** If a non-negative fourth parameter is provided to sqlite3_bind_text()
** or sqlite3_bind_text16() or sqlite3_bind_text64() then
** that parameter must be the byte offset
** where the NUL terminator would occur assuming the string were NUL
** terminated.  If any NUL characters occurs at byte offsets less than 
** the value of the fourth parameter then the resulting string value will
** contain embedded NULs.  The result of expressions involving strings
** with embedded NULs is undefined.
**
** ^The fifth argument to the BLOB and string binding interfaces
** is a destructor used to dispose of the BLOB or
** string after SQLite has finished with it.  ^The destructor is called
................................................................................
** deterministic.  The built-in [random()] SQL function is an example of a
** function that is not deterministic.  The SQLite query planner is able to
** perform additional optimizations on deterministic functions, so use
** of the [SQLITE_DETERMINISTIC] flag is recommended where possible.
**
** ^The fourth parameter may also optionally include the [SQLITE_DIRECTONLY]
** flag, which if present prevents the function from being invoked from
** within VIEWs, TRIGGERs, CHECK constraints, generated column expressions,
** index expressions, or the WHERE clause of partial indexes.
**
** <span style="background-color:#ffff90;">
** For best security, the [SQLITE_DIRECTONLY] flag is recommended for
** all application-defined SQL functions that do not need to be

** used inside of triggers, view, CHECK constraints, or other elements of
** the database schema.  This flags is especially recommended for SQL 
** functions that have side effects or reveal internal application state.
** Without this flag, an attacker might be able to modify the schema of
** a database file to include invocations of the function with parameters
** chosen by the attacker, which the application will then execute when
** the database file is opened and read.
** </span>
**
** ^(The fifth parameter is an arbitrary pointer.  The implementation of the
** function can gain access to this pointer using [sqlite3_user_data()].)^
**
** ^The sixth, seventh and eighth parameters passed to the three
** "sqlite3_create_function*" functions, xFunc, xStep and xFinal, are
** pointers to C-language functions that implement the SQL function or
................................................................................
** <dl>
** [[SQLITE_DETERMINISTIC]] <dt>SQLITE_DETERMINISTIC</dt><dd>
** The SQLITE_DETERMINISTIC flag means that the new function always gives
** the same output when the input parameters are the same.
** The [abs|abs() function] is deterministic, for example, but
** [randomblob|randomblob()] is not.  Functions must
** be deterministic in order to be used in certain contexts such as
** with the WHERE clause of [partial indexes] or in [generated columns].
** SQLite might also optimize deterministic functions by factoring them
** out of inner loops.
** </dd>
** 
** [[SQLITE_DIRECTONLY]] <dt>SQLITE_DIRECTONLY</dt><dd>
** The SQLITE_DIRECTONLY flag means that the function may only be invoked
** from top-level SQL, and cannot be used in VIEWs or TRIGGERs nor in 
** schema structures such as [CHECK constraints], [DEFAULT clauses],
** [expression indexes], [partial indexes], or [generated columns].
** The SQLITE_DIRECTONLY flags is a security feature which is recommended
** for all [application-defined SQL functions], and especially for functions
** that have side-effects or that could potentially leak sensitive
** information.
** </dd>
**
** [[SQLITE_INNOCUOUS]] <dt>SQLITE_INNOCUOUS</dt><dd>
** The SQLITE_INNOCUOUS flag means that the function is unlikely
** to cause problems even if misused.  An innocuous function should have
** no side effects and should not depend on any values other than its
** input parameters. The [abs|abs() function] is an example of an
................................................................................
**
** ^The sqlite3_aggregate_context(C,N) routine returns a NULL pointer 
** when first called if N is less than or equal to zero or if a memory
** allocate error occurs.
**
** ^(The amount of space allocated by sqlite3_aggregate_context(C,N) is
** determined by the N parameter on first successful call.  Changing the
** value of N in any subsequent call to sqlite3_aggregate_context() within
** the same aggregate function instance will not resize the memory
** allocation.)^  Within the xFinal callback, it is customary to set
** N=0 in calls to sqlite3_aggregate_context(C,N) so that no 
** pointless memory allocations occur.
**
** ^SQLite automatically frees the memory allocated by 
** sqlite3_aggregate_context() when the aggregate query concludes.
................................................................................
**
** ^The sqlite3_result_error() and sqlite3_result_error16() functions
** cause the implemented SQL function to throw an exception.
** ^SQLite uses the string pointed to by the
** 2nd parameter of sqlite3_result_error() or sqlite3_result_error16()
** as the text of an error message.  ^SQLite interprets the error
** message string from sqlite3_result_error() as UTF-8. ^SQLite
** interprets the string from sqlite3_result_error16() as UTF-16 using
** the same [byte-order determination rules] as [sqlite3_bind_text16()].
** ^If the third parameter to sqlite3_result_error()
** or sqlite3_result_error16() is negative then SQLite takes as the error
** message all text up through the first zero character.
** ^If the third parameter to sqlite3_result_error() or
** sqlite3_result_error16() is non-negative then SQLite takes that many
** bytes (not characters) from the 2nd parameter as the error message.
** ^The sqlite3_result_error() and sqlite3_result_error16()
** routines make a private copy of the error message text before
................................................................................
** assumes that the text or BLOB result is in constant space and does not
** copy the content of the parameter nor call a destructor on the content
** when it has finished using that result.
** ^If the 4th parameter to the sqlite3_result_text* interfaces
** or sqlite3_result_blob is the special constant SQLITE_TRANSIENT
** then SQLite makes a copy of the result into space obtained
** from [sqlite3_malloc()] before it returns.
**
** ^For the sqlite3_result_text16(), sqlite3_result_text16le(), and
** sqlite3_result_text16be() routines, and for sqlite3_result_text64()
** when the encoding is not UTF8, if the input UTF16 begins with a
** byte-order mark (BOM, U+FEFF) then the BOM is removed from the
** string and the rest of the string is interpreted according to the
** byte-order specified by the BOM.  ^The byte-order specified by
** the BOM at the beginning of the text overrides the byte-order
** specified by the interface procedure.  ^So, for example, if
** sqlite3_result_text16le() is invoked with text that begins
** with bytes 0xfe, 0xff (a big-endian byte-order mark) then the
** first two bytes of input are skipped and the remaining input
** is interpreted as UTF16BE text.
**
** ^For UTF16 input text to the sqlite3_result_text16(),
** sqlite3_result_text16be(), sqlite3_result_text16le(), and
** sqlite3_result_text64() routines, if the text contains invalid
** UTF16 characters, the invalid characters might be converted
** into the unicode replacement character, U+FFFD.
**
** ^The sqlite3_result_value() interface sets the result of
** the application-defined function to be a copy of the
** [unprotected sqlite3_value] object specified by the 2nd parameter.  ^The
** sqlite3_result_value() interface makes a copy of the [sqlite3_value]
** so that the [sqlite3_value] specified in the parameter may change or
** be deallocated after sqlite3_result_value() returns without harm.
................................................................................
);
SQLITE_API int sqlite3_collation_needed16(
  sqlite3*, 
  void*,
  void(*)(void*,sqlite3*,int eTextRep,const void*)
);














































#ifdef SQLITE_ENABLE_CEROD
/*
** Specify the activation key for a CEROD database.  Unless 
** activated, none of the CEROD routines will work.
*/
SQLITE_API void sqlite3_activate_cerod(
  const char *zPassPhrase        /* Activation phrase */
................................................................................
#define SQLITE_TESTCTRL_PRNG_RESET               7  /* NOT USED */
#define SQLITE_TESTCTRL_BITVEC_TEST              8
#define SQLITE_TESTCTRL_FAULT_INSTALL            9
#define SQLITE_TESTCTRL_BENIGN_MALLOC_HOOKS     10
#define SQLITE_TESTCTRL_PENDING_BYTE            11
#define SQLITE_TESTCTRL_ASSERT                  12
#define SQLITE_TESTCTRL_ALWAYS                  13
#define SQLITE_TESTCTRL_RESERVE                 14  /* NOT USED */
#define SQLITE_TESTCTRL_OPTIMIZATIONS           15
#define SQLITE_TESTCTRL_ISKEYWORD               16  /* NOT USED */
#define SQLITE_TESTCTRL_SCRATCHMALLOC           17  /* NOT USED */
#define SQLITE_TESTCTRL_INTERNAL_FUNCTIONS      17
#define SQLITE_TESTCTRL_LOCALTIME_FAULT         18
#define SQLITE_TESTCTRL_EXPLAIN_STMT            19  /* NOT USED */
#define SQLITE_TESTCTRL_ONCE_RESET_THRESHOLD    19
................................................................................
** This function may be called by either the [xConnect] or [xCreate] method
** of a [virtual table] implementation to configure
** various facets of the virtual table interface.
**
** If this interface is invoked outside the context of an xConnect or
** xCreate virtual table method then the behavior is undefined.
**
** In the call sqlite3_vtab_config(D,C,...) the D parameter is the
** [database connection] in which the virtual table is being created and
** which is passed in as the first argument to the [xConnect] or [xCreate]
** method that is invoking sqlite3_vtab_config().  The C parameter is one
** of the [virtual table configuration options].  The presence and meaning
** of parameters after C depend on which [virtual table configuration option]
** is used.
*/
SQLITE_API int sqlite3_vtab_config(sqlite3*, int op, ...);

/*
** CAPI3REF: Virtual Table Configuration Options
** KEYWORDS: {virtual table configuration options} 
** KEYWORDS: {virtual table configuration option}
**
** These macros define the various options to the
** [sqlite3_vtab_config()] interface that [virtual table] implementations
** can use to customize and optimize their behavior.
**
** <dl>
** [[SQLITE_VTAB_CONSTRAINT_SUPPORT]]
................................................................................
#ifndef SQLITE_MAX_ATTACHED
# define SQLITE_MAX_ATTACHED 10
#endif


/*
** The maximum value of a ?nnn wildcard that the parser will accept.
** If the value exceeds 32767 then extra space is required for the Expr
** structure.  But otherwise, we believe that the number can be as large
** as a signed 32-bit integer can hold.
*/
#ifndef SQLITE_MAX_VARIABLE_NUMBER
# define SQLITE_MAX_VARIABLE_NUMBER 32766
#endif

/* Maximum page size.  The upper bound on this value is 65536.  This a limit
** imposed by the use of 16-bit offsets within each page.
**
** Earlier versions of SQLite allowed the user to change this value at
** compile time. This is no longer permitted, on the grounds that it creates
................................................................................
#pragma warn -rch /* unreachable code */
#pragma warn -ccc /* Condition is always true or false */
#pragma warn -aus /* Assigned value is never used */
#pragma warn -csu /* Comparing signed and unsigned */
#pragma warn -spa /* Suspicious pointer arithmetic */
#endif

/*
** WAL mode depends on atomic aligned 32-bit loads and stores in a few
** places.  The following macros try to make this explicit.
*/
#ifndef __has_feature
# define __has_feature(x) 0       /* compatibility with non-clang compilers */
#endif
#if GCC_VERSION>=4007000 || __has_feature(c_atomic)
# define AtomicLoad(PTR)       __atomic_load_n((PTR),__ATOMIC_RELAXED)
# define AtomicStore(PTR,VAL)  __atomic_store_n((PTR),(VAL),__ATOMIC_RELAXED)
#else
# define AtomicLoad(PTR)       (*(PTR))
# define AtomicStore(PTR,VAL)  (*(PTR) = (VAL))
#endif

/*
** Include standard header files as necessary
*/
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#ifdef HAVE_INTTYPES_H
................................................................................
** callback is currently invoked only from within pager.c.
*/
typedef struct BusyHandler BusyHandler;
struct BusyHandler {
  int (*xBusyHandler)(void *,int);  /* The busy callback */
  void *pBusyArg;                   /* First arg to busy callback */
  int nBusy;                        /* Incremented with each busy call */

};

/*
** Name of the master database table.  The master database table
** is a special table that holds the names and attributes of all
** user tables and indices.
*/
................................................................................
#endif
SQLITE_PRIVATE int sqlite3BtreeSetPagerFlags(Btree*,unsigned);
SQLITE_PRIVATE int sqlite3BtreeSetPageSize(Btree *p, int nPagesize, int nReserve, int eFix);
SQLITE_PRIVATE int sqlite3BtreeGetPageSize(Btree*);
SQLITE_PRIVATE int sqlite3BtreeMaxPageCount(Btree*,int);
SQLITE_PRIVATE u32 sqlite3BtreeLastPage(Btree*);
SQLITE_PRIVATE int sqlite3BtreeSecureDelete(Btree*,int);
SQLITE_PRIVATE int sqlite3BtreeGetRequestedReserve(Btree*);
SQLITE_PRIVATE int sqlite3BtreeGetReserveNoMutex(Btree *p);
SQLITE_PRIVATE int sqlite3BtreeSetAutoVacuum(Btree *, int);
SQLITE_PRIVATE int sqlite3BtreeGetAutoVacuum(Btree *);
SQLITE_PRIVATE int sqlite3BtreeBeginTrans(Btree*,int,int*);
SQLITE_PRIVATE int sqlite3BtreeCommitPhaseOne(Btree*, const char *zMaster);
SQLITE_PRIVATE int sqlite3BtreeCommitPhaseTwo(Btree*, int);
SQLITE_PRIVATE int sqlite3BtreeCommit(Btree*);
................................................................................
SQLITE_PRIVATE int sqlite3HeaderSizeBtree(void);

#ifndef NDEBUG
SQLITE_PRIVATE int sqlite3BtreeCursorIsValid(BtCursor*);
#endif
SQLITE_PRIVATE int sqlite3BtreeCursorIsValidNN(BtCursor*);


SQLITE_PRIVATE int sqlite3BtreeCount(sqlite3*, BtCursor*, i64*);


#ifdef SQLITE_TEST
SQLITE_PRIVATE int sqlite3BtreeCursorInfo(BtCursor*, int*, int);
SQLITE_PRIVATE void sqlite3BtreeCursorList(Btree*);
#endif

#ifndef SQLITE_OMIT_WAL
................................................................................
#define OP_Lt             56 /* jump, same as TK_LT, synopsis: IF r[P3]<r[P1] */
#define OP_Ge             57 /* jump, same as TK_GE, synopsis: IF r[P3]>=r[P1] */
#define OP_ElseNotEq      58 /* jump, same as TK_ESCAPE                    */
#define OP_DecrJumpZero   59 /* jump, synopsis: if (--r[P1])==0 goto P2    */
#define OP_IncrVacuum     60 /* jump                                       */
#define OP_VNext          61 /* jump                                       */
#define OP_Init           62 /* jump, synopsis: Start at P2                */
#define OP_PureFunc       63 /* synopsis: r[P3]=func(r[P2@NP])             */
#define OP_Function       64 /* synopsis: r[P3]=func(r[P2@NP])             */
#define OP_Return         65
#define OP_EndCoroutine   66
#define OP_HaltIfNull     67 /* synopsis: if r[P3]=null halt               */
#define OP_Halt           68
#define OP_Integer        69 /* synopsis: r[P2]=P1                         */
#define OP_Int64          70 /* synopsis: r[P2]=P4                         */
#define OP_String         71 /* synopsis: r[P2]='P4' (len=P1)              */
................................................................................
#define OP_ResetCount    123
#define OP_SorterCompare 124 /* synopsis: if key(P1)!=trim(r[P3],P4) goto P2 */
#define OP_SorterData    125 /* synopsis: r[P2]=data                       */
#define OP_RowData       126 /* synopsis: r[P2]=data                       */
#define OP_Rowid         127 /* synopsis: r[P2]=rowid                      */
#define OP_NullRow       128
#define OP_SeekEnd       129
#define OP_IdxInsert     130 /* synopsis: key=r[P2]                        */
#define OP_SorterInsert  131 /* synopsis: key=r[P2]                        */
#define OP_IdxDelete     132 /* synopsis: key=r[P2@P3]                     */
#define OP_DeferredSeek  133 /* synopsis: Move P3 to P1.rowid if needed    */
#define OP_IdxRowid      134 /* synopsis: r[P2]=rowid                      */
#define OP_FinishSeek    135
#define OP_Destroy       136
#define OP_Clear         137
#define OP_ResetSorter   138
................................................................................
SQLITE_PRIVATE void sqlite3VdbeAddParseSchemaOp(Vdbe*,int,char*);
SQLITE_PRIVATE void sqlite3VdbeChangeOpcode(Vdbe*, int addr, u8);
SQLITE_PRIVATE void sqlite3VdbeChangeP1(Vdbe*, int addr, int P1);
SQLITE_PRIVATE void sqlite3VdbeChangeP2(Vdbe*, int addr, int P2);
SQLITE_PRIVATE void sqlite3VdbeChangeP3(Vdbe*, int addr, int P3);
SQLITE_PRIVATE void sqlite3VdbeChangeP5(Vdbe*, u16 P5);
SQLITE_PRIVATE void sqlite3VdbeJumpHere(Vdbe*, int addr);
SQLITE_PRIVATE void sqlite3VdbeJumpHereOrPopInst(Vdbe*, int addr);
SQLITE_PRIVATE int sqlite3VdbeChangeToNoop(Vdbe*, int addr);
SQLITE_PRIVATE int sqlite3VdbeDeletePriorOpcode(Vdbe*, u8 op);
#ifdef SQLITE_DEBUG
SQLITE_PRIVATE   void sqlite3VdbeReleaseRegisters(Parse*,int addr, int n, u32 mask, int);
#else
# define sqlite3VdbeReleaseRegisters(P,A,N,M,F)
#endif
................................................................................
typedef int (*RecordCompare)(int,const void*,UnpackedRecord*);
SQLITE_PRIVATE RecordCompare sqlite3VdbeFindCompare(UnpackedRecord*);

SQLITE_PRIVATE void sqlite3VdbeLinkSubProgram(Vdbe *, SubProgram *);
SQLITE_PRIVATE int sqlite3VdbeHasSubProgram(Vdbe*);

SQLITE_PRIVATE int sqlite3NotPureFunc(sqlite3_context*);
#ifdef SQLITE_ENABLE_BYTECODE_VTAB
SQLITE_PRIVATE int sqlite3VdbeBytecodeVtabInit(sqlite3*);
#endif

/* Use SQLITE_ENABLE_COMMENTS to enable generation of extra comments on
** each VDBE opcode.
**
** Use the SQLITE_ENABLE_MODULE_COMMENTS macro to see some extra no-op
** comments in VDBE programs that show key decision points in the code
** generator.
................................................................................
);
SQLITE_PRIVATE int sqlite3PagerClose(Pager *pPager, sqlite3*);
SQLITE_PRIVATE int sqlite3PagerReadFileheader(Pager*, int, unsigned char*);

/* Functions used to configure a Pager object. */
SQLITE_PRIVATE void sqlite3PagerSetBusyHandler(Pager*, int(*)(void *), void *);
SQLITE_PRIVATE int sqlite3PagerSetPagesize(Pager*, u32*, int);



SQLITE_PRIVATE int sqlite3PagerMaxPageCount(Pager*, int);
SQLITE_PRIVATE void sqlite3PagerSetCachesize(Pager*, int);
SQLITE_PRIVATE int sqlite3PagerSetSpillsize(Pager*, int);
SQLITE_PRIVATE void sqlite3PagerSetMmapLimit(Pager *, sqlite3_int64);
SQLITE_PRIVATE void sqlite3PagerShrink(Pager*);
SQLITE_PRIVATE void sqlite3PagerSetFlags(Pager*,unsigned);
SQLITE_PRIVATE int sqlite3PagerLockingMode(Pager *, int);
................................................................................
#ifndef SQLITE_OMIT_WAL
SQLITE_PRIVATE   int sqlite3PagerCheckpoint(Pager *pPager, sqlite3*, int, int*, int*);
SQLITE_PRIVATE   int sqlite3PagerWalSupported(Pager *pPager);
SQLITE_PRIVATE   int sqlite3PagerWalCallback(Pager *pPager);
SQLITE_PRIVATE   int sqlite3PagerOpenWal(Pager *pPager, int *pisOpen);
SQLITE_PRIVATE   int sqlite3PagerCloseWal(Pager *pPager, sqlite3*);
# ifdef SQLITE_ENABLE_SNAPSHOT
SQLITE_PRIVATE   int sqlite3PagerSnapshotGet(Pager*, sqlite3_snapshot **ppSnapshot);
SQLITE_PRIVATE   int sqlite3PagerSnapshotOpen(Pager*, sqlite3_snapshot *pSnapshot);
SQLITE_PRIVATE   int sqlite3PagerSnapshotRecover(Pager *pPager);
SQLITE_PRIVATE   int sqlite3PagerSnapshotCheck(Pager *pPager, sqlite3_snapshot *pSnapshot);
SQLITE_PRIVATE   void sqlite3PagerSnapshotUnlock(Pager *pPager);
# endif
#endif

#if !defined(SQLITE_OMIT_WAL) && defined(SQLITE_ENABLE_SETLK_TIMEOUT)
SQLITE_PRIVATE   int sqlite3PagerWalWriteLock(Pager*, int);
SQLITE_PRIVATE   void sqlite3PagerWalDb(Pager*, sqlite3*);
#else
# define sqlite3PagerWalWriteLock(y,z) SQLITE_OK
# define sqlite3PagerWalDb(x,y)
#endif

#ifdef SQLITE_DIRECT_OVERFLOW_READ
SQLITE_PRIVATE   int sqlite3PagerDirectReadOk(Pager *pPager, Pgno pgno);
#endif

#ifdef SQLITE_ENABLE_ZIPVFS
SQLITE_PRIVATE   int sqlite3PagerWalFramesize(Pager *pPager);
................................................................................
SQLITE_PRIVATE sqlite3_file *sqlite3PagerJrnlFile(Pager*);
SQLITE_PRIVATE const char *sqlite3PagerJournalname(Pager*);
SQLITE_PRIVATE void *sqlite3PagerTempSpace(Pager*);
SQLITE_PRIVATE int sqlite3PagerIsMemdb(Pager*);
SQLITE_PRIVATE void sqlite3PagerCacheStat(Pager *, int, int, int *);
SQLITE_PRIVATE void sqlite3PagerClearCache(Pager*);
SQLITE_PRIVATE int sqlite3SectorSize(sqlite3_file *);






/* Functions used to truncate the database file. */
SQLITE_PRIVATE void sqlite3PagerTruncateImage(Pager*,Pgno);

SQLITE_PRIVATE void sqlite3PagerRekey(DbPage*, Pgno, u16);





/* Functions to support testing and debugging. */
#if !defined(NDEBUG) || defined(SQLITE_TEST)
SQLITE_PRIVATE   Pgno sqlite3PagerPagenumber(DbPage*);
SQLITE_PRIVATE   int sqlite3PagerIswriteable(DbPage*);
#endif
#ifdef SQLITE_TEST
SQLITE_PRIVATE   int *sqlite3PagerStats(Pager*);
................................................................................
**
** DB_UnresetViews means that one or more views have column names that
** have been filled out.  If the schema changes, these column names might
** changes and so the view will need to be reset.
*/
#define DB_SchemaLoaded    0x0001  /* The schema has been loaded */
#define DB_UnresetViews    0x0002  /* Some views have defined column names */

#define DB_ResetWanted     0x0008  /* Reset the schema when nSchemaLock==0 */

/*
** The number of different kinds of things that can be limited
** using the sqlite3_limit() interface.
*/
#define SQLITE_N_LIMIT (SQLITE_LIMIT_WORKER_THREADS+1)
................................................................................

/*
** Each database connection is an instance of the following structure.
*/
struct sqlite3 {
  sqlite3_vfs *pVfs;            /* OS Interface */
  struct Vdbe *pVdbe;           /* List of active virtual machines */
  CollSeq *pDfltColl;           /* BINARY collseq for the database encoding */
  sqlite3_mutex *mutex;         /* Connection mutex */
  Db *aDb;                      /* All backends */
  int nDb;                      /* Number of backends currently in use */
  u32 mDbFlags;                 /* flags recording internal state */
  u64 flags;                    /* flags settable by pragmas. See below */
  i64 lastRowid;                /* ROWID of most recent insert (see above) */
  i64 szMmap;                   /* Default mmap_size setting */
................................................................................
  VTable *pDisconnect;          /* Disconnect these in next sqlite3_prepare() */
#endif
  Hash aFunc;                   /* Hash table of connection functions */
  Hash aCollSeq;                /* All collating sequences */
  BusyHandler busyHandler;      /* Busy callback */
  Db aDbStatic[2];              /* Static space for the 2 default backends */
  Savepoint *pSavepoint;        /* List of active savepoints */
  int nAnalysisLimit;           /* Number of index rows to ANALYZE */
  int busyTimeout;              /* Busy handler timeout, in msec */
  int nSavepoint;               /* Number of non-transaction savepoints */
  int nStatement;               /* Number of nested statement-transactions  */
  i64 nDeferredCons;            /* Net deferred constraints this transaction. */
  i64 nDeferredImmCons;         /* Net deferred immediate constraints */
  int *pnBytesFreed;            /* If not NULL, increment this in DbFree() */
#ifdef SQLITE_ENABLE_UNLOCK_NOTIFY
................................................................................
*/
#define DBFLAG_SchemaChange   0x0001  /* Uncommitted Hash table changes */
#define DBFLAG_PreferBuiltin  0x0002  /* Preference to built-in funcs */
#define DBFLAG_Vacuum         0x0004  /* Currently in a VACUUM */
#define DBFLAG_VacuumInto     0x0008  /* Currently running VACUUM INTO */
#define DBFLAG_SchemaKnownOk  0x0010  /* Schema is known to be valid */
#define DBFLAG_InternalFunc   0x0020  /* Allow use of internal functions */
#define DBFLAG_EncodingFixed  0x0040  /* No longer possible to change enc. */

/*
** Bits of the sqlite3.dbOptFlags field that are used by the
** sqlite3_test_control(SQLITE_TESTCTRL_OPTIMIZATIONS,...) interface to
** selectively disable various optimizations.
*/
#define SQLITE_QueryFlattener 0x0001   /* Query flattening */
................................................................................
#define SQLITE_FUNC_LIKE     0x0004 /* Candidate for the LIKE optimization */
#define SQLITE_FUNC_CASE     0x0008 /* Case-sensitive LIKE-type function */
#define SQLITE_FUNC_EPHEM    0x0010 /* Ephemeral.  Delete with VDBE */
#define SQLITE_FUNC_NEEDCOLL 0x0020 /* sqlite3GetFuncCollSeq() might be called*/
#define SQLITE_FUNC_LENGTH   0x0040 /* Built-in length() function */
#define SQLITE_FUNC_TYPEOF   0x0080 /* Built-in typeof() function */
#define SQLITE_FUNC_COUNT    0x0100 /* Built-in count(*) aggregate */
/*                           0x0200 -- available for reuse */
#define SQLITE_FUNC_UNLIKELY 0x0400 /* Built-in unlikely() function */
#define SQLITE_FUNC_CONSTANT 0x0800 /* Constant inputs give a constant output */
#define SQLITE_FUNC_MINMAX   0x1000 /* True for min() and max() aggregates */
#define SQLITE_FUNC_SLOCHNG  0x2000 /* "Slow Change". Value constant during a
                                    ** single query - might change over time */
#define SQLITE_FUNC_TEST     0x4000 /* Built-in testing functions */
#define SQLITE_FUNC_OFFSET   0x8000 /* Built-in sqlite_offset() function */
................................................................................

/* Identifier numbers for each in-line function */
#define INLINEFUNC_coalesce             0
#define INLINEFUNC_implies_nonnull_row  1
#define INLINEFUNC_expr_implies_expr    2
#define INLINEFUNC_expr_compare         3      
#define INLINEFUNC_affinity             4
#define INLINEFUNC_iif                  5
#define INLINEFUNC_unlikely            99  /* Default case */

/*
** The following three macros, FUNCTION(), LIKEFUNC() and AGGREGATE() are
** used to create the initializers for the FuncDef structures.
**
**   FUNCTION(zName, nArg, iArg, bNC, xFunc)
................................................................................
struct Column {
  char *zName;     /* Name of this column, \000, then the type */
  Expr *pDflt;     /* Default value or GENERATED ALWAYS AS value */
  char *zColl;     /* Collating sequence.  If NULL, use the default */
  u8 notNull;      /* An OE_ code for handling a NOT NULL constraint */
  char affinity;   /* One of the SQLITE_AFF_... values */
  u8 szEst;        /* Estimated size of value in this column. sizeof(INT)==1 */
  u8 hName;        /* Column name hash for faster lookup */
  u16 colFlags;    /* Boolean properties.  See COLFLAG_ defines below */
};

/* Allowed values for Column.colFlags:
*/
#define COLFLAG_PRIMKEY   0x0001   /* Column is part of the primary key */
#define COLFLAG_HIDDEN    0x0002   /* A hidden column in a virtual table */
................................................................................
/*
** Test to see whether or not a table is a virtual table.  This is
** done as a macro so that it will be optimized out when virtual
** table support is omitted from the build.
*/
#ifndef SQLITE_OMIT_VIRTUALTABLE
#  define IsVirtual(X)      ((X)->nModuleArg)
#  define ExprIsVtab(X)  \
              ((X)->op==TK_COLUMN && (X)->y.pTab!=0 && (X)->y.pTab->nModuleArg)
#else
#  define IsVirtual(X)      0
#  define ExprIsVtab(X)     0
#endif

/*
** Macros to determine if a column is hidden.  IsOrdinaryHiddenColumn()
** only works for non-virtual tables (ordinary tables and views) and is
** always false unless SQLITE_ENABLE_HIDDEN_COLUMNS is defined.  The
** IsHiddenColumn() macro is general purpose.
................................................................................
/*
** The datatype ynVar is a signed integer, either 16-bit or 32-bit.
** Usually it is 16-bits.  But if SQLITE_MAX_VARIABLE_NUMBER is greater
** than 32767 we have to make it 32-bit.  16-bit is preferred because
** it uses less memory in the Expr object, which is a big memory user
** in systems with lots of prepared statements.  And few applications
** need more than about 10 or 20 variables.  But some extreme users want
** to have prepared statements with over 32766 variables, and for them
** the option is available (at compile-time).
*/
#if SQLITE_MAX_VARIABLE_NUMBER<32767
typedef i16 ynVar;
#else
typedef int ynVar;
#endif

/*
** Each node of an expression in the parse tree is an instance
................................................................................
struct Expr {
  u8 op;                 /* Operation performed by this node */
  char affExpr;          /* affinity, or RAISE type */
  u8 op2;                /* TK_REGISTER/TK_TRUTH: original value of Expr.op
                         ** TK_COLUMN: the value of p5 for OP_Column
                         ** TK_AGG_FUNCTION: nesting depth
                         ** TK_FUNCTION: NC_SelfRef flag if needs OP_PureFunc */
#ifdef SQLITE_DEBUG
  u8 vvaFlags;           /* Verification flags. */
#endif
  u32 flags;             /* Various flags.  EP_* See below */
  union {
    char *zToken;          /* Token value. Zero terminated and dequoted */
    int iValue;            /* Non-negative integer value if EP_IntValue */
  } u;

  /* If the EP_TokenOnly flag is set in the Expr.flags mask, then no
................................................................................
#define EP_IntValue   0x000400 /* Integer value contained in u.iValue */
#define EP_xIsSelect  0x000800 /* x.pSelect is valid (otherwise x.pList is) */
#define EP_Skip       0x001000 /* Operator does not contribute to affinity */
#define EP_Reduced    0x002000 /* Expr struct EXPR_REDUCEDSIZE bytes only */
#define EP_TokenOnly  0x004000 /* Expr struct EXPR_TOKENONLYSIZE bytes only */
#define EP_Win        0x008000 /* Contains window functions */
#define EP_MemToken   0x010000 /* Need to sqlite3DbFree() Expr.zToken */
                  /*  0x020000 // available for reuse */
#define EP_Unlikely   0x040000 /* unlikely() or likelihood() function */
#define EP_ConstFunc  0x080000 /* A SQLITE_FUNC_CONSTANT or _SLOCHNG function */
#define EP_CanBeNull  0x100000 /* Can be null despite NOT NULL constraint */
#define EP_Subquery   0x200000 /* Tree contains a TK_SELECT operator */
#define EP_Alias      0x400000 /* Is an alias for a result set column */
#define EP_Leaf       0x800000 /* Expr.pLeft, .pRight, .u.pSelect all NULL */
#define EP_WinFunc   0x1000000 /* TK_FUNCTION with Expr.y.pWin set */
#define EP_Subrtn    0x2000000 /* Uses Expr.y.sub. TK_IN, _SELECT, or _EXISTS */
#define EP_Quoted    0x4000000 /* TK_ID was originally quoted */
#define EP_Static    0x8000000 /* Held in memory not obtained from malloc() */
#define EP_IsTrue   0x10000000 /* Always has boolean value of TRUE */
#define EP_IsFalse  0x20000000 /* Always has boolean value of FALSE */
#define EP_FromDDL  0x40000000 /* Originates from sqlite_master */
               /*   0x80000000 // Available */

/*
** The EP_Propagate mask is a set of properties that automatically propagate
** upwards into parent nodes.
*/
#define EP_Propagate (EP_Collate|EP_Subquery|EP_HasFunc)

................................................................................
#define ExprHasProperty(E,P)     (((E)->flags&(P))!=0)
#define ExprHasAllProperty(E,P)  (((E)->flags&(P))==(P))
#define ExprSetProperty(E,P)     (E)->flags|=(P)
#define ExprClearProperty(E,P)   (E)->flags&=~(P)
#define ExprAlwaysTrue(E)   (((E)->flags&(EP_FromJoin|EP_IsTrue))==EP_IsTrue)
#define ExprAlwaysFalse(E)  (((E)->flags&(EP_FromJoin|EP_IsFalse))==EP_IsFalse)


/* Flags for use with Expr.vvaFlags
*/
#define EP_NoReduce   0x01  /* Cannot EXPRDUP_REDUCE this Expr */
#define EP_Immutable  0x02  /* Do not change this Expr node */

/* The ExprSetVVAProperty() macro is used for Verification, Validation,
** and Accreditation only.  It works like ExprSetProperty() during VVA
** processes but is a no-op for delivery.
*/
#ifdef SQLITE_DEBUG
# define ExprSetVVAProperty(E,P)   (E)->vvaFlags|=(P)
# define ExprHasVVAProperty(E,P)   (((E)->vvaFlags&(P))!=0)
# define ExprClearVVAProperties(E) (E)->vvaFlags = 0
#else
# define ExprSetVVAProperty(E,P)
# define ExprHasVVAProperty(E,P)   0
# define ExprClearVVAProperties(E)
#endif

/*
** Macros to determine the number of bytes required by a normal Expr
** struct, an Expr struct with the EP_Reduced flag set in Expr.flags
** and an Expr struct with the EP_TokenOnly flag set.
*/
................................................................................
    struct IdxExprTrans *pIdxTrans;           /* Convert idxed expr to column */
    ExprList *pGroupBy;                       /* GROUP BY clause */
    Select *pSelect;                          /* HAVING to WHERE clause ctx */
    struct WindowRewrite *pRewrite;           /* Window rewrite context */
    struct WhereConst *pConst;                /* WHERE clause constants */
    struct RenameCtx *pRename;                /* RENAME COLUMN context */
    struct Table *pTab;                       /* Table of generated column */
    struct SrcList_item *pSrcItem;            /* A single FROM clause item */
  } u;
};

/* Forward declarations */
SQLITE_PRIVATE int sqlite3WalkExpr(Walker*, Expr*);
SQLITE_PRIVATE int sqlite3WalkExprList(Walker*, ExprList*);
SQLITE_PRIVATE int sqlite3WalkSelect(Walker*, Select*);
................................................................................
SQLITE_PRIVATE int sqlite3CantopenError(int);
#define SQLITE_CORRUPT_BKPT sqlite3CorruptError(__LINE__)
#define SQLITE_MISUSE_BKPT sqlite3MisuseError(__LINE__)
#define SQLITE_CANTOPEN_BKPT sqlite3CantopenError(__LINE__)
#ifdef SQLITE_DEBUG
SQLITE_PRIVATE   int sqlite3NomemError(int);
SQLITE_PRIVATE   int sqlite3IoerrnomemError(int);

# define SQLITE_NOMEM_BKPT sqlite3NomemError(__LINE__)
# define SQLITE_IOERR_NOMEM_BKPT sqlite3IoerrnomemError(__LINE__)

#else
# define SQLITE_NOMEM_BKPT SQLITE_NOMEM
# define SQLITE_IOERR_NOMEM_BKPT SQLITE_IOERR_NOMEM
#endif
#if defined(SQLITE_DEBUG) || defined(SQLITE_ENABLE_CORRUPT_PGNO)
SQLITE_PRIVATE   int sqlite3CorruptPgnoError(int,Pgno);
# define SQLITE_CORRUPT_PGNO(P) sqlite3CorruptPgnoError(__LINE__,(P))
#else
# define SQLITE_CORRUPT_PGNO(P) sqlite3CorruptError(__LINE__)
#endif

/*
** FTS3 and FTS4 both require virtual table support
*/
#if defined(SQLITE_OMIT_VIRTUALTABLE)
................................................................................
SQLITE_PRIVATE void sqlite3AddCheckConstraint(Parse*, Expr*);
SQLITE_PRIVATE void sqlite3AddDefaultValue(Parse*,Expr*,const char*,const char*);
SQLITE_PRIVATE void sqlite3AddCollateType(Parse*, Token*);
SQLITE_PRIVATE void sqlite3AddGenerated(Parse*,Expr*,Token*);
SQLITE_PRIVATE void sqlite3EndTable(Parse*,Token*,Token*,u8,Select*);
SQLITE_PRIVATE int sqlite3ParseUri(const char*,const char*,unsigned int*,
                    sqlite3_vfs**,char**,char **);



#define sqlite3CodecQueryParameters(A,B,C) 0

SQLITE_PRIVATE Btree *sqlite3DbNameToBtree(sqlite3*,const char*);

#ifdef SQLITE_UNTESTABLE
# define sqlite3FaultSim(X) SQLITE_OK
#else
SQLITE_PRIVATE   int sqlite3FaultSim(int);
#endif
................................................................................
SQLITE_PRIVATE void sqlite3ExprCodeMove(Parse*, int, int, int);
SQLITE_PRIVATE void sqlite3ExprCode(Parse*, Expr*, int);
#ifndef SQLITE_OMIT_GENERATED_COLUMNS
SQLITE_PRIVATE void sqlite3ExprCodeGeneratedColumn(Parse*, Column*, int);
#endif
SQLITE_PRIVATE void sqlite3ExprCodeCopy(Parse*, Expr*, int);
SQLITE_PRIVATE void sqlite3ExprCodeFactorable(Parse*, Expr*, int);
SQLITE_PRIVATE int sqlite3ExprCodeRunJustOnce(Parse*, Expr*, int);
SQLITE_PRIVATE int sqlite3ExprCodeTemp(Parse*, Expr*, int*);
SQLITE_PRIVATE int sqlite3ExprCodeTarget(Parse*, Expr*, int);
SQLITE_PRIVATE int sqlite3ExprCodeExprList(Parse*, ExprList*, int, int, u8);
#define SQLITE_ECEL_DUP      0x01  /* Deep, not shallow copies */
#define SQLITE_ECEL_FACTOR   0x02  /* Factor out constant terms */
#define SQLITE_ECEL_REF      0x04  /* Use ExprList.u.x.iOrderByCol */
#define SQLITE_ECEL_OMITREF  0x08  /* Omit if ExprList.u.x.iOrderByCol */
................................................................................
SQLITE_PRIVATE   int sqlite3AuthReadCol(Parse*, const char *, const char *, int);
#else
# define sqlite3AuthRead(a,b,c,d)
# define sqlite3AuthCheck(a,b,c,d,e)    SQLITE_OK
# define sqlite3AuthContextPush(a,b,c)
# define sqlite3AuthContextPop(a)  ((void)(a))
#endif
SQLITE_PRIVATE int sqlite3DbIsNamed(sqlite3 *db, int iDb, const char *zName);
SQLITE_PRIVATE void sqlite3Attach(Parse*, Expr*, Expr*, Expr*);
SQLITE_PRIVATE void sqlite3Detach(Parse*, Expr*);
SQLITE_PRIVATE void sqlite3FixInit(DbFixer*, Parse*, int, const char*, const Token*);
SQLITE_PRIVATE int sqlite3FixSrcList(DbFixer*, SrcList*);
SQLITE_PRIVATE int sqlite3FixSelect(DbFixer*, Select*);
SQLITE_PRIVATE int sqlite3FixExpr(DbFixer*, Expr*);
SQLITE_PRIVATE int sqlite3FixExprList(DbFixer*, ExprList*);
................................................................................
/*
** The common case is for a varint to be a single byte.  They following
** macros handle the common case without a procedure call, but then call
** the procedure for larger varints.
*/
#define getVarint32(A,B)  \
  (u8)((*(A)<(u8)0x80)?((B)=(u32)*(A)),1:sqlite3GetVarint32((A),(u32 *)&(B)))
#define getVarint32NR(A,B) \
  B=(u32)*(A);if(B>=0x80)sqlite3GetVarint32((A),(u32*)&(B))
#define putVarint32(A,B)  \
  (u8)(((u32)(B)<(u32)0x80)?(*(A)=(unsigned char)(B)),1:\
  sqlite3PutVarint((A),(B)))
#define getVarint    sqlite3GetVarint
#define putVarint    sqlite3PutVarint


SQLITE_PRIVATE const char *sqlite3IndexAffinityStr(sqlite3*, Index*);
SQLITE_PRIVATE void sqlite3TableAffinity(Vdbe*, Table*, int);
SQLITE_PRIVATE char sqlite3CompareAffinity(const Expr *pExpr, char aff2);
SQLITE_PRIVATE int sqlite3IndexAffinityOk(const Expr *pExpr, char idx_affinity);
SQLITE_PRIVATE char sqlite3TableColumnAffinity(Table*,int);
SQLITE_PRIVATE char sqlite3ExprAffinity(const Expr *pExpr);
SQLITE_PRIVATE int sqlite3Atoi64(const char*, i64*, int, u8);
SQLITE_PRIVATE int sqlite3DecOrHexToI64(const char*, i64*);
SQLITE_PRIVATE void sqlite3ErrorWithMsg(sqlite3*, int, const char*,...);
SQLITE_PRIVATE void sqlite3Error(sqlite3*,int);
SQLITE_PRIVATE void sqlite3SystemError(sqlite3*,int);
SQLITE_PRIVATE void *sqlite3HexToBlob(sqlite3*, const char *z, int n);
SQLITE_PRIVATE u8 sqlite3HexToInt(int h);
................................................................................
#endif

SQLITE_PRIVATE const char *sqlite3ErrStr(int);
SQLITE_PRIVATE int sqlite3ReadSchema(Parse *pParse);
SQLITE_PRIVATE CollSeq *sqlite3FindCollSeq(sqlite3*,u8 enc, const char*,int);
SQLITE_PRIVATE int sqlite3IsBinary(const CollSeq*);
SQLITE_PRIVATE CollSeq *sqlite3LocateCollSeq(Parse *pParse, const char*zName);
SQLITE_PRIVATE void sqlite3SetTextEncoding(sqlite3 *db, u8);
SQLITE_PRIVATE CollSeq *sqlite3ExprCollSeq(Parse *pParse, const Expr *pExpr);
SQLITE_PRIVATE CollSeq *sqlite3ExprNNCollSeq(Parse *pParse, const Expr *pExpr);
SQLITE_PRIVATE int sqlite3ExprCollSeqMatch(Parse*,const Expr*,const Expr*);
SQLITE_PRIVATE Expr *sqlite3ExprAddCollateToken(Parse *pParse, Expr*, const Token*, int);
SQLITE_PRIVATE Expr *sqlite3ExprAddCollateString(Parse*,Expr*,const char*);
SQLITE_PRIVATE Expr *sqlite3ExprSkipCollate(Expr*);
SQLITE_PRIVATE Expr *sqlite3ExprSkipCollateAndLikely(Expr*);
SQLITE_PRIVATE int sqlite3CheckCollSeq(Parse *, CollSeq *);
SQLITE_PRIVATE int sqlite3WritableSchema(sqlite3*);
SQLITE_PRIVATE int sqlite3CheckObjectName(Parse*, const char*,const char*,const char*);
................................................................................
SQLITE_PRIVATE void sqlite3SelectWrongNumTermsError(Parse *pParse, Select *p);
SQLITE_PRIVATE int sqlite3MatchEName(
  const struct ExprList_item*,
  const char*,
  const char*,
  const char*
);
SQLITE_PRIVATE Bitmask sqlite3ExprColUsed(Expr*);
SQLITE_PRIVATE u8 sqlite3StrIHash(const char*);
SQLITE_PRIVATE int sqlite3ResolveExprNames(NameContext*, Expr*);
SQLITE_PRIVATE int sqlite3ResolveExprListNames(NameContext*, ExprList*);
SQLITE_PRIVATE void sqlite3ResolveSelectNames(Parse*, Select*, NameContext*);
SQLITE_PRIVATE int sqlite3ResolveSelfReference(Parse*,Table*,int,Expr*,ExprList*);
SQLITE_PRIVATE int sqlite3ResolveOrderGroupBy(Parse*, Select*, ExprList*, const char*);
SQLITE_PRIVATE void sqlite3ColumnDefault(Vdbe *, Table *, int, int);
SQLITE_PRIVATE void sqlite3AlterFinishAddColumn(Parse *, Token *);
................................................................................
SQLITE_PRIVATE void *sqlite3RenameTokenMap(Parse*, void*, Token*);
SQLITE_PRIVATE void sqlite3RenameTokenRemap(Parse*, void *pTo, void *pFrom);
SQLITE_PRIVATE void sqlite3RenameExprUnmap(Parse*, Expr*);
SQLITE_PRIVATE void sqlite3RenameExprlistUnmap(Parse*, ExprList*);
SQLITE_PRIVATE CollSeq *sqlite3GetCollSeq(Parse*, u8, CollSeq *, const char*);
SQLITE_PRIVATE char sqlite3AffinityType(const char*, Column*);
SQLITE_PRIVATE void sqlite3Analyze(Parse*, Token*, Token*);
SQLITE_PRIVATE int sqlite3InvokeBusyHandler(BusyHandler*);
SQLITE_PRIVATE int sqlite3FindDb(sqlite3*, Token*);
SQLITE_PRIVATE int sqlite3FindDbName(sqlite3 *, const char *);
SQLITE_PRIVATE int sqlite3AnalysisLoad(sqlite3*,int iDB);
SQLITE_PRIVATE void sqlite3DeleteIndexSamples(sqlite3*,Index*);
SQLITE_PRIVATE void sqlite3DefaultRowEst(Index*);
SQLITE_PRIVATE void sqlite3RegisterLikeFunctions(sqlite3*, int);
SQLITE_PRIVATE int sqlite3IsLikeFunction(sqlite3*,Expr*,int*,char*);
................................................................................
     void(*)(void*)
   );
#  define sqlite3VtabInSync(db) ((db)->nVTrans>0 && (db)->aVTrans==0)
#endif
SQLITE_PRIVATE int sqlite3ReadOnlyShadowTables(sqlite3 *db);
#ifndef SQLITE_OMIT_VIRTUALTABLE
SQLITE_PRIVATE   int sqlite3ShadowTableName(sqlite3 *db, const char *zName);
SQLITE_PRIVATE   int sqlite3IsShadowTableOf(sqlite3*,Table*,const char*);
#else
# define sqlite3ShadowTableName(A,B) 0
# define sqlite3IsShadowTableOf(A,B,C) 0
#endif
SQLITE_PRIVATE int sqlite3VtabEponymousTableInit(Parse*,Module*);
SQLITE_PRIVATE void sqlite3VtabEponymousTableClear(sqlite3*,Module*);
SQLITE_PRIVATE void sqlite3VtabMakeWritable(Parse*,Table*);
SQLITE_PRIVATE void sqlite3VtabBeginParse(Parse*, Token*, Token*, Token*, int);
SQLITE_PRIVATE void sqlite3VtabFinishParse(Parse*, Token*);
SQLITE_PRIVATE void sqlite3VtabArgInit(Parse*);
................................................................................
SQLITE_PRIVATE int sqlite3TransferBindings(sqlite3_stmt *, sqlite3_stmt *);
SQLITE_PRIVATE void sqlite3ParserReset(Parse*);
#ifdef SQLITE_ENABLE_NORMALIZE
SQLITE_PRIVATE char *sqlite3Normalize(Vdbe*, const char*);
#endif
SQLITE_PRIVATE int sqlite3Reprepare(Vdbe*);
SQLITE_PRIVATE void sqlite3ExprListCheckLength(Parse*, ExprList*, const char*);
SQLITE_PRIVATE CollSeq *sqlite3ExprCompareCollSeq(Parse*,const Expr*);
SQLITE_PRIVATE CollSeq *sqlite3BinaryCompareCollSeq(Parse *, const Expr*, const Expr*);
SQLITE_PRIVATE int sqlite3TempInMemory(const sqlite3*);
SQLITE_PRIVATE const char *sqlite3JournalModename(int);
#ifndef SQLITE_OMIT_WAL
SQLITE_PRIVATE   int sqlite3Checkpoint(sqlite3*, int, int, int*, int*);
SQLITE_PRIVATE   int sqlite3WalDefaultHook(void*,sqlite3*,const char*,int);
#endif
#ifndef SQLITE_OMIT_CTE
................................................................................
**
** EVIDENCE-OF: R-38799-08373 URI filenames can be enabled or disabled
** using the SQLITE_USE_URI=1 or SQLITE_USE_URI=0 compile-time options.
**
** EVIDENCE-OF: R-43642-56306 By default, URI handling is globally
** disabled. The default value may be changed by compiling with the
** SQLITE_USE_URI symbol defined.



*/
#ifndef SQLITE_USE_URI



# define SQLITE_USE_URI 0

#endif

/* EVIDENCE-OF: R-38720-18127 The default setting is determined by the
** SQLITE_ALLOW_COVERING_INDEX_SCAN compile-time option, or is "on" if
** that compile-time option is omitted.
*/
#if !defined(SQLITE_ALLOW_COVERING_INDEX_SCAN)
................................................................................
#endif

/*
** VDBE_DISPLAY_P4 is true or false depending on whether or not the
** "explain" P4 display logic is enabled.
*/
#if !defined(SQLITE_OMIT_EXPLAIN) || !defined(NDEBUG) \
     || defined(VDBE_PROFILE) || defined(SQLITE_DEBUG) \
     || defined(SQLITE_ENABLE_BYTECODE_VTAB)
# define VDBE_DISPLAY_P4 1
#else
# define VDBE_DISPLAY_P4 0
#endif

/*
** SQL is translated into a sequence of instructions to be
................................................................................
  int rcApp;              /* errcode set by sqlite3_result_error_code() */
  u32 nWrite;             /* Number of write operations that have occurred */
#endif
  u16 nResColumn;         /* Number of columns in one row of the result set */
  u8 errorAction;         /* Recovery action to do in case of an error */
  u8 minWriteFileFormat;  /* Minimum file format for writable database files */
  u8 prepFlags;           /* SQLITE_PREPARE_* flags */
  u8 doingRerun;          /* True if rerunning after an auto-reprepare */
  bft expired:2;          /* 1: recompile VM immediately  2: when convenient */
  bft explain:2;          /* True if EXPLAIN present on SQL command */

  bft changeCntOn:1;      /* True to update the change-counter */
  bft runOnlyOnce:1;      /* Automatically expire on reset */
  bft usesStmtJournal:1;  /* True if uses a statement journal */
  bft readOnly:1;         /* True for statements that do not write */
  bft bIsReader:1;        /* True for statements that read */
  yDbMask btreeMask;      /* Bitmask of db->aDb[] entries referenced */
  yDbMask lockMask;       /* Subset of btreeMask that requires a lock */
................................................................................
SQLITE_PRIVATE u32 sqlite3VdbeSerialGet(const unsigned char*, u32, Mem*);
SQLITE_PRIVATE void sqlite3VdbeDeleteAuxData(sqlite3*, AuxData**, int, int);

int sqlite2BtreeKeyCompare(BtCursor *, const void *, int, int, int *);
SQLITE_PRIVATE int sqlite3VdbeIdxKeyCompare(sqlite3*,VdbeCursor*,UnpackedRecord*,int*);
SQLITE_PRIVATE int sqlite3VdbeIdxRowid(sqlite3*, BtCursor*, i64*);
SQLITE_PRIVATE int sqlite3VdbeExec(Vdbe*);
#if !defined(SQLITE_OMIT_EXPLAIN) || defined(SQLITE_ENABLE_BYTECODE_VTAB)
SQLITE_PRIVATE int sqlite3VdbeNextOpcode(Vdbe*,Mem*,int,int*,int*,Op**);
SQLITE_PRIVATE char *sqlite3VdbeDisplayP4(sqlite3*,Op*);
#endif
#if defined(SQLITE_ENABLE_EXPLAIN_COMMENTS)
SQLITE_PRIVATE char *sqlite3VdbeDisplayComment(sqlite3*,const Op*,const char*);
#endif
#if !defined(SQLITE_OMIT_EXPLAIN)
SQLITE_PRIVATE int sqlite3VdbeList(Vdbe*);
#endif
SQLITE_PRIVATE int sqlite3VdbeHalt(Vdbe*);
SQLITE_PRIVATE int sqlite3VdbeChangeEncoding(Mem *, int);
SQLITE_PRIVATE int sqlite3VdbeMemTooBig(Mem*);
SQLITE_PRIVATE int sqlite3VdbeMemCopy(Mem*, const Mem*);
SQLITE_PRIVATE void sqlite3VdbeMemShallowCopy(Mem*, const Mem*, int);
................................................................................
SQLITE_PRIVATE double sqlite3VdbeRealValue(Mem*);
SQLITE_PRIVATE int sqlite3VdbeBooleanValue(Mem*, int ifNull);
SQLITE_PRIVATE void sqlite3VdbeIntegerAffinity(Mem*);
SQLITE_PRIVATE int sqlite3VdbeMemRealify(Mem*);
SQLITE_PRIVATE int sqlite3VdbeMemNumerify(Mem*);
SQLITE_PRIVATE int sqlite3VdbeMemCast(Mem*,u8,u8);
SQLITE_PRIVATE int sqlite3VdbeMemFromBtree(BtCursor*,u32,u32,Mem*);
SQLITE_PRIVATE int sqlite3VdbeMemFromBtreeZeroOffset(BtCursor*,u32,Mem*);
SQLITE_PRIVATE void sqlite3VdbeMemRelease(Mem *p);
SQLITE_PRIVATE int sqlite3VdbeMemFinalize(Mem*, FuncDef*);
#ifndef SQLITE_OMIT_WINDOWFUNC
SQLITE_PRIVATE int sqlite3VdbeMemAggValue(Mem*, Mem*, FuncDef*);
#endif
#if !defined(SQLITE_OMIT_EXPLAIN) || defined(SQLITE_ENABLE_BYTECODE_VTAB)
SQLITE_PRIVATE const char *sqlite3OpcodeName(int);
#endif
SQLITE_PRIVATE int sqlite3VdbeMemGrow(Mem *pMem, int n, int preserve);
SQLITE_PRIVATE int sqlite3VdbeMemClearAndResize(Mem *pMem, int n);
SQLITE_PRIVATE int sqlite3VdbeCloseStatement(Vdbe *, int);
#ifdef SQLITE_DEBUG
SQLITE_PRIVATE int sqlite3VdbeFrameIsValid(VdbeFrame*);
................................................................................
static const struct {
  u8 eType;           /* Transformation type code */
  u8 nName;           /* Length of th name */
  char *zName;        /* Name of the transformation */
  double rLimit;      /* Maximum NNN value for this transform */
  double rXform;      /* Constant used for this transform */
} aXformType[] = {
  { 0, 6, "second", 464269060800.0, 1000.0         },
  { 0, 6, "minute", 7737817680.0,   60000.0        },
  { 0, 4, "hour",   128963628.0,    3600000.0      },
  { 0, 3, "day",    5373485.0,      86400000.0     },
  { 1, 5, "month",  176546.0,       2592000000.0   },
  { 2, 4, "year",   14713.0,        31536000000.0  },
};

/*
** Process a modifier to a date-time stamp.  The modifiers are
** as follows:
**
**     NNN days
................................................................................
  assert( sqlite3GlobalConfig.mutex.xMutexInit );
  rc = sqlite3GlobalConfig.mutex.xMutexInit();

#ifdef SQLITE_DEBUG
  GLOBAL(int, mutexIsInit) = 1;
#endif

  sqlite3MemoryBarrier();
  return rc;
}

/*
** Shutdown the mutex system. This call frees resources allocated by
** sqlite3MutexInit().
*/
................................................................................
    return priorLimit;
  }
  if( mem0.hardLimit>0 && (n>mem0.hardLimit || n==0) ){
    n = mem0.hardLimit;
  }
  mem0.alarmThreshold = n;
  nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
  AtomicStore(&mem0.nearlyFull, n>0 && n<=nUsed);
  sqlite3_mutex_leave(mem0.mutex);
  excess = sqlite3_memory_used() - n;
  if( excess>0 ) sqlite3_release_memory((int)(excess & 0x7fffffff));
  return priorLimit;
}
SQLITE_API void sqlite3_soft_heap_limit(int n){
  if( n<0 ) n = 0;
................................................................................

/*
** Return true if the heap is currently under memory pressure - in other
** words if the amount of heap used is close to the limit set by
** sqlite3_soft_heap_limit().
*/
SQLITE_PRIVATE int sqlite3HeapNearlyFull(void){
  return AtomicLoad(&mem0.nearlyFull);
}

/*
** Deinitialize the memory allocation subsystem.
*/
SQLITE_PRIVATE void sqlite3MallocEnd(void){
  if( sqlite3GlobalConfig.m.xShutdown ){
................................................................................
  ** following xRoundup() call. */
  nFull = sqlite3GlobalConfig.m.xRoundup(n);

  sqlite3StatusHighwater(SQLITE_STATUS_MALLOC_SIZE, n);
  if( mem0.alarmThreshold>0 ){
    sqlite3_int64 nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
    if( nUsed >= mem0.alarmThreshold - nFull ){
      AtomicStore(&mem0.nearlyFull, 1);
      sqlite3MallocAlarm(nFull);
      if( mem0.hardLimit ){
        nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
        if( nUsed >= mem0.hardLimit - nFull ){
          *pp = 0;
          return;
        }
      }
    }else{
      AtomicStore(&mem0.nearlyFull, 0);
    }
  }
  p = sqlite3GlobalConfig.m.xMalloc(nFull);
#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
  if( p==0 && mem0.alarmThreshold>0 ){
    sqlite3MallocAlarm(nFull);
    p = sqlite3GlobalConfig.m.xMalloc(nFull);
................................................................................
    sqlite3StatusHighwater(SQLITE_STATUS_MALLOC_SIZE, (int)nBytes);
    nDiff = nNew - nOld;
    if( nDiff>0 && sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED) >= 
          mem0.alarmThreshold-nDiff ){
      sqlite3MallocAlarm(nDiff);
    }
    pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);
#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
    if( pNew==0 && mem0.alarmThreshold>0 ){
      sqlite3MallocAlarm((int)nBytes);
      pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);
    }
#endif
    if( pNew ){
      nNew = sqlite3MallocSize(pNew);
      sqlite3StatusUp(SQLITE_STATUS_MEMORY_USED, nNew-nOld);
    }
    sqlite3_mutex_leave(mem0.mutex);
  }else{
    pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);
................................................................................
        memcpy(pNew, p, lookasideMallocSize(db, p));
        sqlite3DbFree(db, p);
      }
    }else{
      assert( sqlite3MemdebugHasType(p, (MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
      assert( sqlite3MemdebugNoType(p, (u8)~(MEMTYPE_LOOKASIDE|MEMTYPE_HEAP)) );
      sqlite3MemdebugSetType(p, MEMTYPE_HEAP);
      pNew = sqlite3Realloc(p, n);
      if( !pNew ){
        sqlite3OomFault(db);
      }
      sqlite3MemdebugSetType(pNew,
            (db->lookaside.bDisable==0 ? MEMTYPE_LOOKASIDE : MEMTYPE_HEAP));
    }
  }
................................................................................
** temporarily disable the lookaside memory allocator and interrupt
** any running VDBEs.
*/
SQLITE_PRIVATE void sqlite3OomFault(sqlite3 *db){
  if( db->mallocFailed==0 && db->bBenignMalloc==0 ){
    db->mallocFailed = 1;
    if( db->nVdbeExec>0 ){
      AtomicStore(&db->u1.isInterrupted, 1);
    }
    DisableLookaside;
    if( db->pParse ){
      db->pParse->rc = SQLITE_NOMEM_BKPT;
    }
  }
}
................................................................................
**
** The memory allocator is not restarted if there are running
** VDBEs.
*/
SQLITE_PRIVATE void sqlite3OomClear(sqlite3 *db){
  if( db->mallocFailed && db->nVdbeExec==0 ){
    db->mallocFailed = 0;
    AtomicStore(&db->u1.isInterrupted, 0);
    assert( db->lookaside.bDisable>0 );
    EnableLookaside;
  }
}

/*
** Take actions at the end of an API call to indicate an OOM error
................................................................................
      return 0;
    }else{
      p->nAlloc = (int)szNew;
    }
    if( p->db ){
      zNew = sqlite3DbRealloc(p->db, zOld, p->nAlloc);
    }else{
      zNew = sqlite3Realloc(zOld, p->nAlloc);
    }
    if( zNew ){
      assert( p->zText!=0 || p->nChar==0 );
      if( !isMalloced(p) && p->nChar>0 ) memcpy(zNew, p->zText, p->nChar);
      p->zText = zNew;
      p->nAlloc = sqlite3DbMallocSize(p->db, zNew);
      p->printfFlags |= SQLITE_PRINTF_MALLOCED;
................................................................................
** A version of printf() that understands %lld.  Used for debugging.
** The printf() built into some versions of windows does not understand %lld
** and segfaults if you give it a long long int.
*/
SQLITE_PRIVATE void sqlite3DebugPrintf(const char *zFormat, ...){
  va_list ap;
  StrAccum acc;
  char zBuf[SQLITE_PRINT_BUF_SIZE*10];
  sqlite3StrAccumInit(&acc, 0, zBuf, sizeof(zBuf), 0);
  va_start(ap,zFormat);
  sqlite3_str_vappendf(&acc, zFormat, ap);
  va_end(ap);
  sqlite3StrAccumFinish(&acc);
#ifdef SQLITE_OS_TRACE_PROC
  {
................................................................................
    sqlite3_str_appendf(&x, "{%d:*}", pItem->iCursor);
    if( pItem->zDatabase ){
      sqlite3_str_appendf(&x, " %s.%s", pItem->zDatabase, pItem->zName);
    }else if( pItem->zName ){
      sqlite3_str_appendf(&x, " %s", pItem->zName);
    }
    if( pItem->pTab ){
      sqlite3_str_appendf(&x, " tab=%Q nCol=%d ptr=%p used=%llx",
           pItem->pTab->zName, pItem->pTab->nCol, pItem->pTab, pItem->colUsed);
    }
    if( pItem->zAlias ){
      sqlite3_str_appendf(&x, " (AS %s)", pItem->zAlias);
    }
    if( pItem->fg.jointype & JT_LEFT ){
      sqlite3_str_appendf(&x, " LEFT-JOIN");
    }
................................................................................

/*
** Generate a human-readable explanation of an expression tree.
*/
SQLITE_PRIVATE void sqlite3TreeViewExpr(TreeView *pView, const Expr *pExpr, u8 moreToFollow){
  const char *zBinOp = 0;   /* Binary operator */
  const char *zUniOp = 0;   /* Unary operator */
  char zFlgs[200];
  pView = sqlite3TreeViewPush(pView, moreToFollow);
  if( pExpr==0 ){
    sqlite3TreeViewLine(pView, "nil");
    sqlite3TreeViewPop(pView);
    return;
  }
  if( pExpr->flags || pExpr->affExpr || pExpr->vvaFlags ){
    StrAccum x;
    sqlite3StrAccumInit(&x, 0, zFlgs, sizeof(zFlgs), 0);
    sqlite3_str_appendf(&x, " fg.af=%x.%c",
      pExpr->flags, pExpr->affExpr ? pExpr->affExpr : 'n');
    if( ExprHasProperty(pExpr, EP_FromJoin) ){
      sqlite3_str_appendf(&x, " iRJT=%d", pExpr->iRightJoinTable);
    }
    if( ExprHasProperty(pExpr, EP_FromDDL) ){
      sqlite3_str_appendf(&x, " DDL");
    }
    if( ExprHasVVAProperty(pExpr, EP_Immutable) ){
      sqlite3_str_appendf(&x, " IMMUTABLE");
    }
    sqlite3StrAccumFinish(&x);
  }else{
    zFlgs[0] = 0;
  }
  switch( pExpr->op ){
    case TK_AGG_COLUMN: {
................................................................................
    case TK_BITAND:  zBinOp = "BITAND"; break;
    case TK_BITOR:   zBinOp = "BITOR";  break;
    case TK_SLASH:   zBinOp = "DIV";    break;
    case TK_LSHIFT:  zBinOp = "LSHIFT"; break;
    case TK_RSHIFT:  zBinOp = "RSHIFT"; break;
    case TK_CONCAT:  zBinOp = "CONCAT"; break;
    case TK_DOT:     zBinOp = "DOT";    break;
    case TK_LIMIT:   zBinOp = "LIMIT";  break;

    case TK_UMINUS:  zUniOp = "UMINUS"; break;
    case TK_UPLUS:   zUniOp = "UPLUS";  break;
    case TK_BITNOT:  zUniOp = "BITNOT"; break;
    case TK_NOT:     zUniOp = "NOT";    break;
    case TK_ISNULL:  zUniOp = "ISNULL"; break;
    case TK_NOTNULL: zUniOp = "NOTNULL"; break;
................................................................................
    *zOut++ = (u8)(0x00D8 + (((c-0x10000)>>18)&0x03));              \
    *zOut++ = (u8)(((c>>10)&0x003F) + (((c-0x10000)>>10)&0x00C0));  \
    *zOut++ = (u8)(0x00DC + ((c>>8)&0x03));                         \
    *zOut++ = (u8)(c&0x00FF);                                       \
  }                                                                 \
}





















/*
** Translate a single UTF-8 character.  Return the unicode value.
**
** During translation, assume that the byte that zTerm points
** is a 0x00.
**
** Write a pointer to the next unread byte back into *pzNext.
................................................................................
    pMem->n = (int)(z - zOut);
    *z++ = 0;
  }else{
    assert( desiredEnc==SQLITE_UTF8 );
    if( pMem->enc==SQLITE_UTF16LE ){
      /* UTF-16 Little-endian -> UTF-8 */
      while( zIn<zTerm ){
        c = *(zIn++);
        c += (*(zIn++))<<8;
        if( c>=0xd800 && c<0xe000 ){
          if( c>=0xdc00 || zIn>=zTerm ){
            c = 0xfffd;
          }else{
            int c2 = *(zIn++);
            c2 += (*(zIn++))<<8;
            if( c2<0xdc00 || c2>=0xe000 ){
              zIn -= 2;
              c = 0xfffd;
            }else{
              c = ((c&0x3ff)<<10) + (c2&0x3ff) + 0x10000;
            }
          }
        }
        WRITE_UTF8(z, c);
      }
    }else{
      /* UTF-16 Big-endian -> UTF-8 */
      while( zIn<zTerm ){
        c = (*(zIn++))<<8;
        c += *(zIn++);
        if( c>=0xd800 && c<0xe000 ){
          if( c>=0xdc00 || zIn>=zTerm ){
            c = 0xfffd;
          }else{
            int c2 = (*(zIn++))<<8;
            c2 += *(zIn++);
            if( c2<0xdc00 || c2>=0xe000 ){
              zIn -= 2;
              c = 0xfffd;
            }else{
              c = ((c&0x3ff)<<10) + (c2&0x3ff) + 0x10000;
            }
          }
        }
        WRITE_UTF8(z, c);
      }
    }
    pMem->n = (int)(z - zOut);
  }
  *z = 0;
  assert( (pMem->n+(desiredEnc==SQLITE_UTF8?1:2))<=len );
................................................................................
** in pZ.  nChar must be non-negative.
*/
SQLITE_PRIVATE int sqlite3Utf16ByteLen(const void *zIn, int nChar){
  int c;
  unsigned char const *z = zIn;
  int n = 0;
  
  if( SQLITE_UTF16NATIVE==SQLITE_UTF16LE ) z++;
  while( n<nChar ){
    c = z[0];
    z += 2;




    if( c>=0xd8 && c<0xdc && z[0]>=0xdc && z[0]<0xe0 ) z += 2;
    n++;
  }

  return (int)(z-(unsigned char const *)zIn) 
              - (SQLITE_UTF16NATIVE==SQLITE_UTF16LE);
}

#if defined(SQLITE_TEST)
/*
** This routine is called from the TCL test function "translate_selftest".
** It checks that the primitives for serializing and deserializing
** characters in each encoding are inverses of each other.
................................................................................
    z[0] = 0;
    z = zBuf;
    c = sqlite3Utf8Read((const u8**)&z);
    t = i;
    if( i>=0xD800 && i<=0xDFFF ) t = 0xFFFD;
    if( (i&0xFFFFFFFE)==0xFFFE ) t = 0xFFFD;
    assert( c==t );
























    assert( (z-zBuf)==n );
  }
}
#endif /* SQLITE_TEST */
#endif /* SQLITE_OMIT_UTF16 */

/************** End of utf.c *************************************************/
................................................................................
    return 1;
  }
  a = (unsigned char *)zLeft;
  b = (unsigned char *)zRight;
  while( N-- > 0 && *a!=0 && UpperToLower[*a]==UpperToLower[*b]){ a++; b++; }
  return N<0 ? 0 : UpperToLower[*a] - UpperToLower[*b];
}

/*
** Compute an 8-bit hash on a string that is insensitive to case differences
*/
SQLITE_PRIVATE u8 sqlite3StrIHash(const char *z){
  u8 h = 0;
  if( z==0 ) return 0;
  while( z[0] ){
    h += UpperToLower[(unsigned char)z[0]];
    z++;
  }
  return h;
}

/*
** Compute 10 to the E-th power.  Examples:  E==1 results in 10.
** E==2 results in 100.  E==50 results in 1.0e50.
**
** This routine only works for values of E between 1 and 341.
*/
................................................................................
#endif
#ifdef SQLITE_EBCDIC
  h += 9*(1&~(h>>4));
#endif
  return (u8)(h & 0xf);
}

#if !defined(SQLITE_OMIT_BLOB_LITERAL)
/*
** Convert a BLOB literal of the form "x'hhhhhh'" into its binary
** value.  Return a pointer to its binary value.  Space to hold the
** binary value has been obtained from malloc and must be freed by
** the calling routine.
*/
SQLITE_PRIVATE void *sqlite3HexToBlob(sqlite3 *db, const char *z, int n){
................................................................................
    for(i=0; i<n; i+=2){
      zBlob[i/2] = (sqlite3HexToInt(z[i])<<4) | sqlite3HexToInt(z[i+1]);
    }
    zBlob[i/2] = 0;
  }
  return zBlob;
}
#endif /* !SQLITE_OMIT_BLOB_LITERAL */

/*
** Log an error that is an API call on a connection pointer that should
** not have been used.  The "type" of connection pointer is given as the
** argument.  The zType is a word like "NULL" or "closed" or "invalid".
*/
static void logBadConnection(const char *zType){
................................................................................
    /*  56 */ "Lt"               OpHelp("IF r[P3]<r[P1]"),
    /*  57 */ "Ge"               OpHelp("IF r[P3]>=r[P1]"),
    /*  58 */ "ElseNotEq"        OpHelp(""),
    /*  59 */ "DecrJumpZero"     OpHelp("if (--r[P1])==0 goto P2"),
    /*  60 */ "IncrVacuum"       OpHelp(""),
    /*  61 */ "VNext"            OpHelp(""),
    /*  62 */ "Init"             OpHelp("Start at P2"),
    /*  63 */ "PureFunc"         OpHelp("r[P3]=func(r[P2@NP])"),
    /*  64 */ "Function"         OpHelp("r[P3]=func(r[P2@NP])"),
    /*  65 */ "Return"           OpHelp(""),
    /*  66 */ "EndCoroutine"     OpHelp(""),
    /*  67 */ "HaltIfNull"       OpHelp("if r[P3]=null halt"),
    /*  68 */ "Halt"             OpHelp(""),
    /*  69 */ "Integer"          OpHelp("r[P2]=P1"),
    /*  70 */ "Int64"            OpHelp("r[P2]=P4"),
    /*  71 */ "String"           OpHelp("r[P2]='P4' (len=P1)"),
................................................................................
    /* 123 */ "ResetCount"       OpHelp(""),
    /* 124 */ "SorterCompare"    OpHelp("if key(P1)!=trim(r[P3],P4) goto P2"),
    /* 125 */ "SorterData"       OpHelp("r[P2]=data"),
    /* 126 */ "RowData"          OpHelp("r[P2]=data"),
    /* 127 */ "Rowid"            OpHelp("r[P2]=rowid"),
    /* 128 */ "NullRow"          OpHelp(""),
    /* 129 */ "SeekEnd"          OpHelp(""),
    /* 130 */ "IdxInsert"        OpHelp("key=r[P2]"),
    /* 131 */ "SorterInsert"     OpHelp("key=r[P2]"),
    /* 132 */ "IdxDelete"        OpHelp("key=r[P2@P3]"),
    /* 133 */ "DeferredSeek"     OpHelp("Move P3 to P1.rowid if needed"),
    /* 134 */ "IdxRowid"         OpHelp("r[P2]=rowid"),
    /* 135 */ "FinishSeek"       OpHelp(""),
    /* 136 */ "Destroy"          OpHelp(""),
    /* 137 */ "Clear"            OpHelp(""),
    /* 138 */ "ResetSorter"      OpHelp(""),
................................................................................
      break;
    }
    if( fd>=SQLITE_MINIMUM_FILE_DESCRIPTOR ) break;
    osClose(fd);
    sqlite3_log(SQLITE_WARNING, 
                "attempt to open \"%s\" as file descriptor %d", z, fd);
    fd = -1;
    if( osOpen("/dev/null", O_RDONLY, m)<0 ) break;
  }
  if( fd>=0 ){
    if( m!=0 ){
      struct stat statbuf;
      if( osFstat(fd, &statbuf)==0 
       && statbuf.st_size==0
       && (statbuf.st_mode&0777)!=m 
................................................................................
# define osSetPosixAdvisoryLock(h,x,t) osFcntl(h,F_SETLK,x)
#else
static int osSetPosixAdvisoryLock(
  int h,                /* The file descriptor on which to take the lock */
  struct flock *pLock,  /* The description of the lock */
  unixFile *pFile       /* Structure holding timeout value */
){
  int tm = pFile->iBusyTimeout;
  int rc = osFcntl(h,F_SETLK,pLock);
  while( rc<0 && tm>0 ){
    /* On systems that support some kind of blocking file lock with a timeout,
    ** make appropriate changes here to invoke that blocking file lock.  On
    ** generic posix, however, there is no such API.  So we simply try the
    ** lock once every millisecond until either the timeout expires, or until
    ** the lock is obtained. */
    usleep(1000);
    rc = osFcntl(h,F_SETLK,pLock);
    tm--;
  }
  return rc;
}
#endif /* SQLITE_ENABLE_SETLK_TIMEOUT */


/*
................................................................................
  for(ii=(int)strlen(zDirname); ii>0 && zDirname[ii]!='/'; ii--);
  if( ii>0 ){
    zDirname[ii] = '\0';
  }else{
    if( zDirname[0]!='/' ) zDirname[0] = '.';
    zDirname[1] = 0;
  }
  fd = robust_open(zDirname, O_RDONLY|O_BINARY, 0);
  if( fd>=0 ){
    OSTRACE(("OPENDIR %-3d %s\n", fd, zDirname));
  }
  *pFd = fd;
  if( fd>=0 ) return SQLITE_OK;
  return unixLogError(SQLITE_CANTOPEN_BKPT, "openDirectory", zDirname);
}
................................................................................
    }
    case SQLITE_FCNTL_HAS_MOVED: {
      *(int*)pArg = fileHasMoved(pFile);
      return SQLITE_OK;
    }
#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
    case SQLITE_FCNTL_LOCK_TIMEOUT: {
      int iOld = pFile->iBusyTimeout;
      pFile->iBusyTimeout = *(int*)pArg;
      *(int*)pArg = iOld;
      return SQLITE_OK;
    }
#endif
#if SQLITE_MAX_MMAP_SIZE>0
    case SQLITE_FCNTL_MMAP_SIZE: {
      i64 newLimit = *(i64*)pArg;
      int rc = SQLITE_OK;
................................................................................
  /* Shared locks never span more than one byte */
  assert( n==1 || lockType!=F_RDLCK );

  /* Locks are within range */
  assert( n>=1 && n<=SQLITE_SHM_NLOCK );

  if( pShmNode->hShm>=0 ){
    int res;
    /* Initialize the locking parameters */
    f.l_type = lockType;
    f.l_whence = SEEK_SET;
    f.l_start = ofst;
    f.l_len = n;
    res = osSetPosixAdvisoryLock(pShmNode->hShm, &f, pFile);
    if( res==-1 ){
#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
      rc = (pFile->iBusyTimeout ? SQLITE_BUSY_TIMEOUT : SQLITE_BUSY);
#else
      rc = SQLITE_BUSY;
#endif
    }
  }

  /* Update the global lock state and do debug tracing */
#ifdef SQLITE_DEBUG
  { u16 mask;
  OSTRACE(("SHM-LOCK "));
  mask = ofst>31 ? 0xffff : (1<<(ofst+n)) - (1<<ofst);
................................................................................
  assert( flags==(SQLITE_SHM_LOCK | SQLITE_SHM_SHARED)
       || flags==(SQLITE_SHM_LOCK | SQLITE_SHM_EXCLUSIVE)
       || flags==(SQLITE_SHM_UNLOCK | SQLITE_SHM_SHARED)
       || flags==(SQLITE_SHM_UNLOCK | SQLITE_SHM_EXCLUSIVE) );
  assert( n==1 || (flags & SQLITE_SHM_EXCLUSIVE)!=0 );
  assert( pShmNode->hShm>=0 || pDbFd->pInode->bProcessLock==1 );
  assert( pShmNode->hShm<0 || pDbFd->pInode->bProcessLock==0 );

  /* Check that, if this to be a blocking lock, no locks that occur later
  ** in the following list than the lock being obtained are already held:
  **
  **   1. Checkpointer lock (ofst==1).
  **   2. Write lock (ofst==0).
  **   3. Read locks (ofst>=3 && ofst<SQLITE_SHM_NLOCK).
  **
  ** In other words, if this is a blocking lock, none of the locks that
  ** occur later in the above list than the lock being obtained may be
  ** held.  */
#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
  assert( (flags & SQLITE_SHM_UNLOCK) || pDbFd->iBusyTimeout==0 || (
         (ofst!=2)                                   /* not RECOVER */
      && (ofst!=1 || (p->exclMask|p->sharedMask)==0)
      && (ofst!=0 || (p->exclMask|p->sharedMask)<3)
      && (ofst<3  || (p->exclMask|p->sharedMask)<(1<<ofst))
  ));
#endif

  mask = (1<<(ofst+n)) - (1<<ofst);
  assert( n>1 || mask==(1<<ofst) );
  sqlite3_mutex_enter(pShmNode->pShmMutex);
  if( flags & SQLITE_SHM_UNLOCK ){
    u16 allMask = 0; /* Mask of locks held by siblings */

................................................................................
    pFile->ctrlFlags |= mask;
  }
}

/* Forward references to VFS helper methods used for temporary files */
static int winGetTempname(sqlite3_vfs *, char **);
static int winIsDir(const void *);
static BOOL winIsLongPathPrefix(const char *);
static BOOL winIsDriveLetterAndColon(const char *);

/*
** Control and query of the open file handle.
*/
static int winFileControl(sqlite3_file *id, int op, void *pArg){
  winFile *pFile = (winFile*)id;
................................................................................
      assert(!"Invalid flags argument");
  }
  *pResOut = rc;
  OSTRACE(("ACCESS name=%s, pResOut=%p, *pResOut=%d, rc=SQLITE_OK\n",
           zFilename, pResOut, *pResOut));
  return SQLITE_OK;
}

/*
** Returns non-zero if the specified path name starts with the "long path"
** prefix.
*/
static BOOL winIsLongPathPrefix(
  const char *zPathname
){
  return ( zPathname[0]=='\\' && zPathname[1]=='\\'
        && zPathname[2]=='?'  && zPathname[3]=='\\' );
}

/*
** Returns non-zero if the specified path name starts with a drive letter
** followed by a colon character.
*/
static BOOL winIsDriveLetterAndColon(
  const char *zPathname
................................................................................
){
#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && !defined(__CYGWIN__)
  DWORD nByte;
  void *zConverted;
  char *zOut;
#endif

  /* If this path name begins with "/X:" or "\\?\", where "X" is any
  ** alphabetic character, discard the initial "/" from the pathname.
  */
  if( zRelative[0]=='/' && (winIsDriveLetterAndColon(zRelative+1)
       || winIsLongPathPrefix(zRelative+1)) ){
    zRelative++;
  }

#if defined(__CYGWIN__)
  SimulateIOError( return SQLITE_ERROR );
  UNUSED_PARAMETER(nFull);
  assert( nFull>=pVfs->mxPathname );
................................................................................
    return SQLITE_FULL;
  }
  if( newSz>p->szMax ){
    return SQLITE_FULL;
  }
  newSz *= 2;
  if( newSz>p->szMax ) newSz = p->szMax;
  pNew = sqlite3Realloc(p->aData, newSz);
  if( pNew==0 ) return SQLITE_NOMEM;
  p->aData = pNew;
  p->szAlloc = newSz;
  return SQLITE_OK;
}

/*
................................................................................
  sqlite3RowSetClear(pArg);
  sqlite3DbFree(((RowSet*)pArg)->db, pArg);
}

/*
** Allocate a new RowSetEntry object that is associated with the
** given RowSet.  Return a pointer to the new and completely uninitialized
** object.
**
** In an OOM situation, the RowSet.db->mallocFailed flag is set and this
** routine returns NULL.
*/
static struct RowSetEntry *rowSetEntryAlloc(RowSet *p){
  assert( p!=0 );
  if( p->nFresh==0 ){  /*OPTIMIZATION-IF-FALSE*/
................................................................................
  ** To save unnecessary work, only do this when the batch number changes.
  */
  if( iBatch!=pRowSet->iBatch ){  /*OPTIMIZATION-IF-FALSE*/
    p = pRowSet->pEntry;
    if( p ){
      struct RowSetEntry **ppPrevTree = &pRowSet->pForest;
      if( (pRowSet->rsFlags & ROWSET_SORTED)==0 ){ /*OPTIMIZATION-IF-FALSE*/
        /* Only sort the current set of entries if they need it */
        p = rowSetEntrySort(p);
      }
      for(pTree = pRowSet->pForest; pTree; pTree=pTree->pRight){
        ppPrevTree = &pTree->pRight;
        if( pTree->pLeft==0 ){
          pTree->pLeft = rowSetListToTree(p);
          break;
................................................................................
** stored in each frame (i.e. the db page-size when the WAL was created).
*/
SQLITE_PRIVATE int sqlite3WalFramesize(Wal *pWal);
#endif

/* Return the sqlite3_file object for the WAL file */
SQLITE_PRIVATE sqlite3_file *sqlite3WalFile(Wal *pWal);

#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
SQLITE_PRIVATE int sqlite3WalWriteLock(Wal *pWal, int bLock);
SQLITE_PRIVATE void sqlite3WalDb(Wal *pWal, sqlite3 *db);
#endif

#endif /* ifndef SQLITE_OMIT_WAL */
#endif /* SQLITE_WAL_H */

/************** End of wal.h *************************************************/
/************** Continuing where we left off in pager.c **********************/

................................................................................
** PagerSharedLock() for more detail.
**
** Pager.eLock may only be set to UNKNOWN_LOCK when the pager is in 
** PAGER_OPEN state.
*/
#define UNKNOWN_LOCK                (EXCLUSIVE_LOCK+1)















/*
** The maximum allowed sector size. 64KiB. If the xSectorsize() method 
** returns a value larger than this, then MAX_SECTOR_SIZE is used instead.
** This could conceivably cause corruption following a power failure on
** such a system. This is currently an undocumented limit.
*/
#define MAX_SECTOR_SIZE 0x10000
................................................................................
  void *pBusyHandlerArg;      /* Context argument for xBusyHandler */
  int aStat[4];               /* Total cache hits, misses, writes, spills */
#ifdef SQLITE_TEST
  int nRead;                  /* Database pages read */
#endif
  void (*xReiniter)(DbPage*); /* Call this routine when reloading pages */
  int (*xGet)(Pager*,Pgno,DbPage**,int); /* Routine to fetch a patch */






  char *pTmpSpace;            /* Pager.pageSize bytes of space for tmp use */
  PCache *pPCache;            /* Pointer to page cache object */
#ifndef SQLITE_OMIT_WAL
  Wal *pWal;                  /* Write-ahead log used by "journal_mode=wal" */
  char *zWal;                 /* File name for write-ahead log */
#endif
};
................................................................................
**   * the database file is open,
**   * there are no dirty pages in the cache, and
**   * the desired page is not currently in the wal file.
*/
SQLITE_PRIVATE int sqlite3PagerDirectReadOk(Pager *pPager, Pgno pgno){
  if( pPager->fd->pMethods==0 ) return 0;
  if( sqlite3PCacheIsDirty(pPager->pPCache) ) return 0;



#ifndef SQLITE_OMIT_WAL
  if( pPager->pWal ){
    u32 iRead = 0;
    int rc;
    rc = sqlite3WalFindFrame(pPager->pWal, pgno, &iRead);
    return (rc==SQLITE_OK && iRead==0);
  }
................................................................................
** Set the Pager.xGet method for the appropriate routine used to fetch
** content from the pager.
*/
static void setGetterMethod(Pager *pPager){
  if( pPager->errCode ){
    pPager->xGet = getPageError;
#if SQLITE_MAX_MMAP_SIZE>0
  }else if( USEFETCH(pPager) ){




    pPager->xGet = getPageMMap;
#endif /* SQLITE_MAX_MMAP_SIZE>0 */
  }else{
    pPager->xGet = getPageNormal;
  }
}

................................................................................
  while( i>0 ){
    cksum += aData[i];
    i -= 200;
  }
  return cksum;
}






























/*
** Read a single page from either the journal file (if isMainJrnl==1) or
** from the sub-journal (if isMainJrnl==0) and playback that page.
** The page begins at offset *pOffset into the file. The *pOffset
** value is increased to the start of the next page in the journal.
**
** The main rollback journal uses checksums - the statement journal does 
................................................................................
  int rc;
  PgHdr *pPg;                   /* An existing page in the cache */
  Pgno pgno;                    /* The page number of a page in journal */
  u32 cksum;                    /* Checksum used for sanity checking */
  char *aData;                  /* Temporary storage for the page */
  sqlite3_file *jfd;            /* The file descriptor for the journal file */
  int isSynced;                 /* True if journal page is synced */






  assert( (isMainJrnl&~1)==0 );      /* isMainJrnl is 0 or 1 */
  assert( (isSavepnt&~1)==0 );       /* isSavepnt is 0 or 1 */
  assert( isMainJrnl || pDone );     /* pDone always used on sub-journals */
  assert( isSavepnt || pDone==0 );   /* pDone never used on non-savepoint */

  aData = pPager->pTmpSpace;
................................................................................
    return rc;
  }

  /* When playing back page 1, restore the nReserve setting
  */
  if( pgno==1 && pPager->nReserve!=((u8*)aData)[20] ){
    pPager->nReserve = ((u8*)aData)[20];

  }

  /* If the pager is in CACHEMOD state, then there must be a copy of this
  ** page in the pager cache. In this case just update the pager cache,
  ** not the database file. The page is left marked dirty in this case.
  **
  ** An exception to the above rule: If the database is in no-sync mode
................................................................................

    /* Write the data read from the journal back into the database file.
    ** This is usually safe even for an encrypted database - as the data
    ** was encrypted before it was written to the journal file. The exception
    ** is if the data was just read from an in-memory sub-journal. In that
    ** case it must be encrypted here before it is copied into the database
    ** file.  */







    rc = sqlite3OsWrite(pPager->fd, (u8 *)aData, pPager->pageSize, ofst);

    if( pgno>pPager->dbFileSize ){
      pPager->dbFileSize = pgno;
    }
    if( pPager->pBackup ){







      sqlite3BackupUpdate(pPager->pBackup, pgno, (u8*)aData);
    }
  }else if( !isMainJrnl && pPg==0 ){
    /* If this is a rollback of a savepoint and data was not written to
    ** the database and the page is not in-memory, there is a potential
    ** problem. When the page is next fetched by the b-tree layer, it 
    ** will be read from the database file, which may or may not be 
................................................................................
    pager_set_pagehash(pPg);

    /* If this was page 1, then restore the value of Pager.dbFileVers.
    ** Do this before any decoding. */
    if( pgno==1 ){
      memcpy(&pPager->dbFileVers, &((u8*)pData)[24],sizeof(pPager->dbFileVers));
    }





    sqlite3PcacheRelease(pPg);
  }
  return rc;
}

/*
** Parameter zMaster is the name of a master journal file. A single journal
................................................................................
    if( rc!=SQLITE_OK ){
      goto delmaster_out;
    }
    if( exists ){
      /* One of the journals pointed to by the master journal exists.
      ** Open it and check if it points at the master journal. If
      ** so, return without deleting the master journal file.
      ** NB:  zJournal is really a MAIN_JOURNAL.  But call it a 
      ** MASTER_JOURNAL here so that the VFS will not send the zJournal
      ** name into sqlite3_database_file_object().
      */
      int c;
      int flags = (SQLITE_OPEN_READONLY|SQLITE_OPEN_MASTER_JOURNAL);
      rc = sqlite3OsOpen(pVfs, zJournal, pJournal, flags, 0);
      if( rc!=SQLITE_OK ){
        goto delmaster_out;
      }

      rc = readMasterJournal(pJournal, zMasterPtr, nMasterPtr);
      sqlite3OsClose(pJournal);
................................................................................
      */
      memset(pPager->dbFileVers, 0xff, sizeof(pPager->dbFileVers));
    }else{
      u8 *dbFileVers = &((u8*)pPg->pData)[24];
      memcpy(&pPager->dbFileVers, dbFileVers, sizeof(pPager->dbFileVers));
    }
  }


  PAGER_INCR(sqlite3_pager_readdb_count);
  PAGER_INCR(pPager->nRead);
  IOTRACE(("PGIN %p %d\n", pPager, pPg->pgno));
  PAGERTRACE(("FETCH %d page %d hash(%08x)\n",
               PAGERID(pPager), pPg->pgno, pager_pagehash(pPg)));

  return rc;
................................................................................
  }

  *pPageSize = pPager->pageSize;
  if( rc==SQLITE_OK ){
    if( nReserve<0 ) nReserve = pPager->nReserve;
    assert( nReserve>=0 && nReserve<1000 );
    pPager->nReserve = (i16)nReserve;

    pagerFixMaplimit(pPager);
  }
  return rc;
}

/*
** Return a pointer to the "temporary page" buffer held internally
................................................................................
  enable_simulated_io_errors();
  PAGERTRACE(("CLOSE %d\n", PAGERID(pPager)));
  IOTRACE(("CLOSE %p\n", pPager))
  sqlite3OsClose(pPager->jfd);
  sqlite3OsClose(pPager->fd);
  sqlite3PageFree(pTmp);
  sqlite3PcacheClose(pPager->pPCache);





  assert( !pPager->aSavepoint && !pPager->pInJournal );
  assert( !isOpen(pPager->jfd) && !isOpen(pPager->sjfd) );

  sqlite3_free(pPager);
  return SQLITE_OK;
}

................................................................................
    if( pgno<=pPager->dbSize && 0==(pList->flags&PGHDR_DONT_WRITE) ){
      i64 offset = (pgno-1)*(i64)pPager->pageSize;   /* Offset to write */
      char *pData;                                   /* Data to write */    

      assert( (pList->flags&PGHDR_NEED_SYNC)==0 );
      if( pList->pgno==1 ) pager_write_changecounter(pList);

      pData = pList->pData;


      /* Write out the page data. */
      rc = sqlite3OsWrite(pPager->fd, pData, pPager->pageSize, offset);

      /* If page 1 was just written, update Pager.dbFileVers to match
      ** the value now stored in the database file. If writing this 
      ** page caused the database file to grow, update dbFileSize. 
................................................................................

    /* If the sub-journal was opened successfully (or was already open),
    ** write the journal record into the file.  */
    if( rc==SQLITE_OK ){
      void *pData = pPg->pData;
      i64 offset = (i64)pPager->nSubRec*(4+pPager->pageSize);
      char *pData2;






      pData2 = pData;
      PAGERTRACE(("STMT-JOURNAL %d page %d\n", PAGERID(pPager), pPg->pgno));
      rc = write32bits(pPager->sjfd, offset, pPg->pgno);
      if( rc==SQLITE_OK ){
        rc = sqlite3OsWrite(pPager->sjfd, pData2, pPager->pageSize, offset+4);
      }
    }
................................................................................
  ** file name. The layout in memory is as follows:
  **
  **     Pager object                    (sizeof(Pager) bytes)
  **     PCache object                   (sqlite3PcacheSize() bytes)
  **     Database file handle            (pVfs->szOsFile bytes)
  **     Sub-journal file handle         (journalFileSize bytes)
  **     Main journal file handle        (journalFileSize bytes)
  **     Ptr back to the Pager           (sizeof(Pager*) bytes)



  **     \0\0\0\0 database prefix        (4 bytes)
  **     Database file name              (nPathname+1 bytes)
  **     URI query parameters            (nUriByte bytes)
  **     Journal filename                (nPathname+8+1 bytes)
  **     WAL filename                    (nPathname+4+1 bytes)
  **     \0\0\0 terminator               (3 bytes)
  **
  ** Some 3rd-party software, over which we have no control, depends on
  ** the specific order of the filenames and the \0 separators between them
  ** so that it can (for example) find the database filename given the WAL
  ** filename without using the sqlite3_filename_database() API.  This is a
  ** misuse of SQLite and a bug in the 3rd-party software, but the 3rd-party
  ** software is in widespread use, so we try to avoid changing the filename
  ** order and formatting if possible.  In particular, the details of the
  ** filename format expected by 3rd-party software should be as follows:
  **
  **   - Main Database Path
  **   - \0
  **   - Multiple URI components consisting of:
  **     - Key
  **     - \0
  **     - Value
  **     - \0
  **   - \0
  **   - Journal Path
  **   - \0
  **   - WAL Path (zWALName)
  **   - \0
  **
  ** The sqlite3_create_filename() interface and the databaseFilename() utility
  ** that is used by sqlite3_filename_database() and kin also depend on the
  ** specific formatting and order of the various filenames, so if the format
  ** changes here, be sure to change it there as well.
  */
  pPtr = (u8 *)sqlite3MallocZero(
    ROUND8(sizeof(*pPager)) +            /* Pager structure */
    ROUND8(pcacheSize) +                 /* PCache object */
    ROUND8(pVfs->szOsFile) +             /* The main db file */
    journalFileSize * 2 +                /* The two journal files */
    sizeof(pPager) +                     /* Space to hold a pointer */
    4 +                                  /* Database prefix */
    nPathname + 1 +                      /* database filename */
    nUriByte +                           /* query parameters */
    nPathname + 8 + 1 +                  /* Journal filename */
#ifndef SQLITE_OMIT_WAL

    nPathname + 4 + 1 +                  /* WAL filename */
#endif



    3                                    /* Terminator */
  );
  assert( EIGHT_BYTE_ALIGNMENT(SQLITE_INT_TO_PTR(journalFileSize)) );
  if( !pPtr ){
    sqlite3DbFree(0, zPathname);
    return SQLITE_NOMEM_BKPT;
  }
  pPager = (Pager*)pPtr;                  pPtr += ROUND8(sizeof(*pPager));
  pPager->pPCache = (PCache*)pPtr;        pPtr += ROUND8(pcacheSize);
  pPager->fd = (sqlite3_file*)pPtr;       pPtr += ROUND8(pVfs->szOsFile);
  pPager->sjfd = (sqlite3_file*)pPtr;     pPtr += journalFileSize;
  pPager->jfd =  (sqlite3_file*)pPtr;     pPtr += journalFileSize;
  assert( EIGHT_BYTE_ALIGNMENT(pPager->jfd) );
  memcpy(pPtr, &pPager, sizeof(pPager));  pPtr += sizeof(pPager);

  /* Fill in the Pager.zFilename and pPager.zQueryParam fields */
                                          pPtr += 4;  /* Skip zero prefix */
  pPager->zFilename = (char*)pPtr;
  if( nPathname>0 ){
    memcpy(pPtr, zPathname, nPathname);   pPtr += nPathname + 1;
    if( zUri ){
      memcpy(pPtr, zUri, nUriByte);       pPtr += nUriByte;
    }else{
                                          pPtr++;
    }
  }


  /* Fill in Pager.zJournal */

  if( nPathname>0 ){
    pPager->zJournal = (char*)pPtr;
    memcpy(pPtr, zPathname, nPathname);   pPtr += nPathname;
    memcpy(pPtr, "-journal",8);           pPtr += 8 + 1;
#ifdef SQLITE_ENABLE_8_3_NAMES
    sqlite3FileSuffix3(zFilename,pPager->zJournal);
    pPtr = (u8*)(pPager->zJournal + sqlite3Strlen30(pPager->zJournal)+1);
#endif
  }else{
    pPager->zJournal = 0;

  }

#ifndef SQLITE_OMIT_WAL
  /* Fill in Pager.zWal */

  if( nPathname>0 ){
    pPager->zWal = (char*)pPtr;
    memcpy(pPtr, zPathname, nPathname);   pPtr += nPathname;
    memcpy(pPtr, "-wal", 4);              pPtr += 4 + 1;
#ifdef SQLITE_ENABLE_8_3_NAMES
    sqlite3FileSuffix3(zFilename, pPager->zWal);
    pPtr = (u8*)(pPager->zWal + sqlite3Strlen30(pPager->zWal)+1);
#endif
  }else{
    pPager->zWal = 0;

  }
#endif










  if( nPathname ) sqlite3DbFree(0, zPathname);
  pPager->pVfs = pVfs;
  pPager->vfsFlags = vfsFlags;

  /* Open the pager file.
  */
  if( zFilename && zFilename[0] ){
................................................................................
  /* memset(pPager->aHash, 0, sizeof(pPager->aHash)); */
  /* pPager->szMmap = SQLITE_DEFAULT_MMAP_SIZE // will be set by btree.c */

  *ppPager = pPager;
  return SQLITE_OK;
}

/*
** Return the sqlite3_file for the main database given the name
** of the corresonding WAL or Journal name as passed into
** xOpen.
*/
SQLITE_API sqlite3_file *sqlite3_database_file_object(const char *zName){
  Pager *pPager;
  while( zName[-1]!=0 || zName[-2]!=0 || zName[-3]!=0 || zName[-4]!=0 ){
    zName--;
  }
  pPager = *(Pager**)(zName - 4 - sizeof(Pager*));
  return pPager->fd;
}


/*
** This function is called after transitioning from PAGER_UNLOCK to
** PAGER_SHARED state. It tests if there is a hot journal present in
** the file-system for the given pager. A hot journal is one that 
** needs to be played back. According to this function, a hot-journal
................................................................................
  ** flag was specified by the caller. And so long as the db is not a 
  ** temporary or in-memory database.  */
  const int bMmapOk = (pgno>1
   && (pPager->eState==PAGER_READER || (flags & PAGER_GET_READONLY))
  );

  assert( USEFETCH(pPager) );




  /* Optimization note:  Adding the "pgno<=1" term before "pgno==0" here
  ** allows the compiler optimizer to reuse the results of the "pgno>1"
  ** test in the previous statement, and avoid testing pgno==0 in the
  ** common case where pgno is large. */
  if( pgno<=1 && pgno==0 ){
    return SQLITE_CORRUPT_BKPT;
................................................................................
}
SQLITE_PRIVATE void sqlite3PagerUnrefPageOne(DbPage *pPg){
  Pager *pPager;
  assert( pPg!=0 );
  assert( pPg->pgno==1 );
  assert( (pPg->flags & PGHDR_MMAP)==0 ); /* Page1 is never memory mapped */
  pPager = pPg->pPager;

  sqlite3PcacheRelease(pPg);
  pagerUnlockIfUnused(pPager);
}

/*
** This function is called at the start of every write transaction.
** There must already be a RESERVED or EXCLUSIVE lock on the database 
................................................................................

  /* We should never write to the journal file the page that
  ** contains the database locks.  The following assert verifies
  ** that we do not. */
  assert( pPg->pgno!=PAGER_MJ_PGNO(pPager) );

  assert( pPager->journalHdr<=pPager->journalOff );
  pData2 = pPg->pData;
  cksum = pager_cksum(pPager, (u8*)pData2);

  /* Even if an IO or diskfull error occurs while journalling the
  ** page in the block above, set the need-sync flag for the page.
  ** Otherwise, when the transaction is rolled back, the logic in
  ** playback_one_page() will think that the page needs to be restored
  ** in the database file. And if an IO error occurs while doing so,
................................................................................
      /* Actually do the update of the change counter */
      pager_write_changecounter(pPgHdr);

      /* If running in direct mode, write the contents of page 1 to the file. */
      if( DIRECT_MODE ){
        const void *zBuf;
        assert( pPager->dbFileSize>0 );
        zBuf = pPgHdr->pData;
        if( rc==SQLITE_OK ){
          rc = sqlite3OsWrite(pPager->fd, zBuf, pPager->pageSize, 0);
          pPager->aStat[PAGER_STAT_WRITE]++;
        }
        if( rc==SQLITE_OK ){
          /* Update the pager's copy of the change-counter. Otherwise, the
          ** next time a read transaction is opened the cache will be
................................................................................
** shared cache, it uses nullIfMemDb==0 so that in-memory databases can
** participate in shared-cache.
**
** The return value to this routine is always safe to use with
** sqlite3_uri_parameter() and sqlite3_filename_database() and friends.
*/
SQLITE_PRIVATE const char *sqlite3PagerFilename(const Pager *pPager, int nullIfMemDb){
  static const char zFake[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
  return (nullIfMemDb && pPager->memDb) ? &zFake[4] : pPager->zFilename;
}

/*
** Return the VFS structure for the pager.
*/
SQLITE_PRIVATE sqlite3_vfs *sqlite3PagerVfs(Pager *pPager){
  return pPager->pVfs;
................................................................................
** with the pager.  This might return NULL if the file has
** not yet been opened.
*/
SQLITE_PRIVATE sqlite3_file *sqlite3PagerFile(Pager *pPager){
  return pPager->fd;
}











/*
** Return the file handle for the journal file (if it exists).
** This will be either the rollback journal or the WAL file.
*/
SQLITE_PRIVATE sqlite3_file *sqlite3PagerJrnlFile(Pager *pPager){
#if SQLITE_OMIT_WAL
  return pPager->jfd;
................................................................................
/*
** Return the full pathname of the journal file.
*/
SQLITE_PRIVATE const char *sqlite3PagerJournalname(Pager *pPager){
  return pPager->zJournal;
}

















































#ifndef SQLITE_OMIT_AUTOVACUUM
/*
** Move the page pPg to location pgno in the file.
**
** There must be no references to the page previously located at
** pgno (which we call pPgOld) though that page is allowed to be
** in cache.  If the page previously located at pgno is not already
................................................................................
  if( pPager->pWal ){
    rc = sqlite3WalCheckpoint(pPager->pWal, db, eMode,
        (eMode==SQLITE_CHECKPOINT_PASSIVE ? 0 : pPager->xBusyHandler),
        pPager->pBusyHandlerArg,
        pPager->walSyncFlags, pPager->pageSize, (u8 *)pPager->pTmpSpace,
        pnLog, pnCkpt
    );

  }
  return rc;
}

SQLITE_PRIVATE int sqlite3PagerWalCallback(Pager *pPager){
  return sqlite3WalCallback(pPager->pWal);
}
................................................................................
      pagerFixMaplimit(pPager);
      if( rc && !pPager->exclusiveMode ) pagerUnlockDb(pPager, SHARED_LOCK);
    }
  }
  return rc;
}

#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
/*
** If pager pPager is a wal-mode database not in exclusive locking mode,
** invoke the sqlite3WalWriteLock() function on the associated Wal object 
** with the same db and bLock parameters as were passed to this function.
** Return an SQLite error code if an error occurs, or SQLITE_OK otherwise.
*/
SQLITE_PRIVATE int sqlite3PagerWalWriteLock(Pager *pPager, int bLock){
  int rc = SQLITE_OK;
  if( pagerUseWal(pPager) && pPager->exclusiveMode==0 ){
    rc = sqlite3WalWriteLock(pPager->pWal, bLock);
  }
  return rc;
}

/*
** Set the database handle used by the wal layer to determine if 
** blocking locks are required.
*/
SQLITE_PRIVATE void sqlite3PagerWalDb(Pager *pPager, sqlite3 *db){
  if( pagerUseWal(pPager) ){
    sqlite3WalDb(pPager->pWal, db);
  }
}
#endif

#ifdef SQLITE_ENABLE_SNAPSHOT
/*
** If this is a WAL database, obtain a snapshot handle for the snapshot
** currently open. Otherwise, return an error.
*/
SQLITE_PRIVATE int sqlite3PagerSnapshotGet(Pager *pPager, sqlite3_snapshot **ppSnapshot){
................................................................................
}

/*
** If this is a WAL database, store a pointer to pSnapshot. Next time a
** read transaction is opened, attempt to read from the snapshot it 
** identifies. If this is not a WAL database, return an error.
*/
SQLITE_PRIVATE int sqlite3PagerSnapshotOpen(
  Pager *pPager, 
  sqlite3_snapshot *pSnapshot
){
  int rc = SQLITE_OK;
  if( pPager->pWal ){
    sqlite3WalSnapshotOpen(pPager->pWal, pSnapshot);
  }else{
    rc = SQLITE_ERROR;
  }
  return rc;
................................................................................
#if defined(SQLITE_TEST) && defined(SQLITE_DEBUG)
SQLITE_PRIVATE int sqlite3WalTrace = 0;
# define WALTRACE(X)  if(sqlite3WalTrace) sqlite3DebugPrintf X
#else
# define WALTRACE(X)
#endif













/*
** The maximum (and only) versions of the wal and wal-index formats
** that may be interpreted by this version of SQLite.
**
** If a client begins recovering a WAL file and finds that (a) the checksum
** values in the wal-header are correct and (b) the version field is not
** WAL_MAX_VERSION, recovery fails and SQLite returns SQLITE_CANTOPEN.
................................................................................
  u32 nCkpt;                 /* Checkpoint sequence counter in the wal-header */
#ifdef SQLITE_DEBUG
  u8 lockError;              /* True if a locking error has occurred */
#endif
#ifdef SQLITE_ENABLE_SNAPSHOT
  WalIndexHdr *pSnapshot;    /* Start transaction here if not NULL */
#endif
#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
  sqlite3 *db;
#endif
};

/*
** Candidate values for Wal.exclusiveMode.
*/
#define WAL_NORMAL_MODE     0
#define WAL_EXCLUSIVE_MODE  1     
................................................................................
){
  int rc = SQLITE_OK;

  /* Enlarge the pWal->apWiData[] array if required */
  if( pWal->nWiData<=iPage ){
    sqlite3_int64 nByte = sizeof(u32*)*(iPage+1);
    volatile u32 **apNew;
    apNew = (volatile u32 **)sqlite3Realloc((void *)pWal->apWiData, nByte);
    if( !apNew ){
      *ppPage = 0;
      return SQLITE_NOMEM_BKPT;
    }
    memset((void*)&apNew[pWal->nWiData], 0,
           sizeof(u32*)*(iPage+1-pWal->nWiData));
    pWal->apWiData = apNew;
................................................................................
static int walLockShared(Wal *pWal, int lockIdx){
  int rc;
  if( pWal->exclusiveMode ) return SQLITE_OK;
  rc = sqlite3OsShmLock(pWal->pDbFd, lockIdx, 1,
                        SQLITE_SHM_LOCK | SQLITE_SHM_SHARED);
  WALTRACE(("WAL%p: acquire SHARED-%s %s\n", pWal,
            walLockName(lockIdx), rc ? "failed" : "ok"));
  VVA_ONLY( pWal->lockError = (u8)(rc!=SQLITE_OK && (rc&0xFF)!=SQLITE_BUSY); )
  return rc;
}
static void walUnlockShared(Wal *pWal, int lockIdx){
  if( pWal->exclusiveMode ) return;
  (void)sqlite3OsShmLock(pWal->pDbFd, lockIdx, 1,
                         SQLITE_SHM_UNLOCK | SQLITE_SHM_SHARED);
  WALTRACE(("WAL%p: release SHARED-%s\n", pWal, walLockName(lockIdx)));
................................................................................
static int walLockExclusive(Wal *pWal, int lockIdx, int n){
  int rc;
  if( pWal->exclusiveMode ) return SQLITE_OK;
  rc = sqlite3OsShmLock(pWal->pDbFd, lockIdx, n,
                        SQLITE_SHM_LOCK | SQLITE_SHM_EXCLUSIVE);
  WALTRACE(("WAL%p: acquire EXCLUSIVE-%s cnt=%d %s\n", pWal,
            walLockName(lockIdx), n, rc ? "failed" : "ok"));
  VVA_ONLY( pWal->lockError = (u8)(rc!=SQLITE_OK && (rc&0xFF)!=SQLITE_BUSY); )
  return rc;
}
static void walUnlockExclusive(Wal *pWal, int lockIdx, int n){
  if( pWal->exclusiveMode ) return;
  (void)sqlite3OsShmLock(pWal->pDbFd, lockIdx, n,
                         SQLITE_SHM_UNLOCK | SQLITE_SHM_EXCLUSIVE);
  WALTRACE(("WAL%p: release EXCLUSIVE-%s cnt=%d\n", pWal,
................................................................................
  if( rc!=SQLITE_OK ){
    walIteratorFree(p);
    p = 0;
  }
  *pp = p;
  return rc;
}

#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
/*
** Attempt to enable blocking locks. Blocking locks are enabled only if (a)
** they are supported by the VFS, and (b) the database handle is configured 
** with a busy-timeout. Return 1 if blocking locks are successfully enabled, 
** or 0 otherwise.
*/
static int walEnableBlocking(Wal *pWal){
  int res = 0;
  if( pWal->db ){
    int tmout = pWal->db->busyTimeout;
    if( tmout ){
      int rc;
      rc = sqlite3OsFileControl(
          pWal->pDbFd, SQLITE_FCNTL_LOCK_TIMEOUT, (void*)&tmout
      );
      res = (rc==SQLITE_OK);
    }
  }
  return res;
}

/*
** Disable blocking locks.
*/
static void walDisableBlocking(Wal *pWal){
  int tmout = 0;
  sqlite3OsFileControl(pWal->pDbFd, SQLITE_FCNTL_LOCK_TIMEOUT, (void*)&tmout);
}

/*
** If parameter bLock is true, attempt to enable blocking locks, take
** the WRITER lock, and then disable blocking locks. If blocking locks
** cannot be enabled, no attempt to obtain the WRITER lock is made. Return 
** an SQLite error code if an error occurs, or SQLITE_OK otherwise. It is not
** an error if blocking locks can not be enabled.
**
** If the bLock parameter is false and the WRITER lock is held, release it.
*/
SQLITE_PRIVATE int sqlite3WalWriteLock(Wal *pWal, int bLock){
  int rc = SQLITE_OK;
  assert( pWal->readLock<0 || bLock==0 );
  if( bLock ){
    assert( pWal->db );
    if( walEnableBlocking(pWal) ){
      rc = walLockExclusive(pWal, WAL_WRITE_LOCK, 1);
      if( rc==SQLITE_OK ){
        pWal->writeLock = 1;
      }
      walDisableBlocking(pWal);
    }
  }else if( pWal->writeLock ){
    walUnlockExclusive(pWal, WAL_WRITE_LOCK, 1);
    pWal->writeLock = 0;
  }
  return rc;
}

/*
** Set the database handle used to determine if blocking locks are required.
*/
SQLITE_PRIVATE void sqlite3WalDb(Wal *pWal, sqlite3 *db){
  pWal->db = db;
}

/*
** Take an exclusive WRITE lock. Blocking if so configured.
*/
static int walLockWriter(Wal *pWal){
  int rc;
  walEnableBlocking(pWal);
  rc = walLockExclusive(pWal, WAL_WRITE_LOCK, 1);
  walDisableBlocking(pWal);
  return rc;
}
#else
# define walEnableBlocking(x) 0
# define walDisableBlocking(x)
# define walLockWriter(pWal) walLockExclusive((pWal), WAL_WRITE_LOCK, 1)
# define sqlite3WalDb(pWal, db)
#endif   /* ifdef SQLITE_ENABLE_SETLK_TIMEOUT */


/*
** Attempt to obtain the exclusive WAL lock defined by parameters lockIdx and
** n. If the attempt fails and parameter xBusy is not NULL, then it is a
** busy-handler function. Invoke it and retry the lock until either the
** lock is successfully obtained or the busy-handler returns 0.
*/
................................................................................
  int lockIdx,                    /* Offset of first byte to lock */
  int n                           /* Number of bytes to lock */
){
  int rc;
  do {
    rc = walLockExclusive(pWal, lockIdx, n);
  }while( xBusy && rc==SQLITE_BUSY && xBusy(pBusyArg) );
#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
  if( rc==SQLITE_BUSY_TIMEOUT ){
    walDisableBlocking(pWal);
    rc = SQLITE_BUSY;
  }
#endif
  return rc;
}

/*
** The cache of the wal-index header must be valid to call this function.
** Return the page-size in bytes used by the database.
*/
................................................................................
  int i;                          /* Loop counter */
  u32 *aSalt = pWal->hdr.aSalt;   /* Big-endian salt values */
  pWal->nCkpt++;
  pWal->hdr.mxFrame = 0;
  sqlite3Put4byte((u8*)&aSalt[0], 1 + sqlite3Get4byte((u8*)&aSalt[0]));
  memcpy(&pWal->hdr.aSalt[1], &salt1, 4);
  walIndexWriteHdr(pWal);
  AtomicStore(&pInfo->nBackfill, 0);
  pInfo->nBackfillAttempted = 0;
  pInfo->aReadMark[1] = 0;
  for(i=2; i<WAL_NREADER; i++) pInfo->aReadMark[i] = READMARK_NOT_USED;
  assert( pInfo->aReadMark[0]==0 );
}

/*
................................................................................

      /* If the database may grow as a result of this checkpoint, hint
      ** about the eventual size of the db file to the VFS layer.
      */
      if( rc==SQLITE_OK ){
        i64 nReq = ((i64)mxPage * szPage);
        i64 nSize;                    /* Current size of database file */
        sqlite3OsFileControl(pWal->pDbFd, SQLITE_FCNTL_CKPT_START, 0);
        rc = sqlite3OsFileSize(pWal->pDbFd, &nSize);
        if( rc==SQLITE_OK && nSize<nReq ){
          sqlite3OsFileControlHint(pWal->pDbFd, SQLITE_FCNTL_SIZE_HINT, &nReq);
        }
      }


      /* Iterate through the contents of the WAL, copying data to the db file */
      while( rc==SQLITE_OK && 0==walIteratorNext(pIter, &iDbpage, &iFrame) ){
        i64 iOffset;
        assert( walFramePgno(pWal, iFrame)==iDbpage );
        if( AtomicLoad(&db->u1.isInterrupted) ){
          rc = db->mallocFailed ? SQLITE_NOMEM_BKPT : SQLITE_INTERRUPT;
          break;
        }
        if( iFrame<=nBackfill || iFrame>mxSafeFrame || iDbpage>mxPage ){
          continue;
        }
        iOffset = walFrameOffset(iFrame, szPage) + WAL_FRAME_HDRSIZE;
................................................................................
        rc = sqlite3OsRead(pWal->pWalFd, zBuf, szPage, iOffset);
        if( rc!=SQLITE_OK ) break;
        iOffset = (iDbpage-1)*(i64)szPage;
        testcase( IS_BIG_INT(iOffset) );
        rc = sqlite3OsWrite(pWal->pDbFd, zBuf, szPage, iOffset);
        if( rc!=SQLITE_OK ) break;
      }
      sqlite3OsFileControl(pWal->pDbFd, SQLITE_FCNTL_CKPT_DONE, 0);

      /* If work was actually accomplished... */
      if( rc==SQLITE_OK ){
        if( mxSafeFrame==walIndexHdr(pWal)->mxFrame ){
          i64 szDb = pWal->hdr.nPage*(i64)szPage;
          testcase( IS_BIG_INT(szDb) );
          rc = sqlite3OsTruncate(pWal->pDbFd, szDb);
          if( rc==SQLITE_OK ){
            rc = sqlite3OsSync(pWal->pDbFd, CKPT_SYNC_FLAGS(sync_flags));
          }
        }
        if( rc==SQLITE_OK ){




          AtomicStore(&pInfo->nBackfill, mxSafeFrame);
        }
      }

      /* Release the reader lock held while backfilling */
      walUnlockExclusive(pWal, WAL_READ_LOCK(0), 1);
    }

................................................................................
  ** being modified by another thread or process.
  */
  badHdr = (page0 ? walIndexTryHdr(pWal, pChanged) : 1);

  /* If the first attempt failed, it might have been due to a race
  ** with a writer.  So get a WRITE lock and try again.
  */

  if( badHdr ){
    if( pWal->bShmUnreliable==0 && (pWal->readOnly & WAL_SHM_RDONLY) ){
      if( SQLITE_OK==(rc = walLockShared(pWal, WAL_WRITE_LOCK)) ){
        walUnlockShared(pWal, WAL_WRITE_LOCK);
        rc = SQLITE_READONLY_RECOVERY;
      }
    }else{
      int bWriteLock = pWal->writeLock;
      if( bWriteLock || SQLITE_OK==(rc = walLockWriter(pWal)) ){
        pWal->writeLock = 1;
        if( SQLITE_OK==(rc = walIndexPage(pWal, 0, &page0)) ){
          badHdr = walIndexTryHdr(pWal, pChanged);
          if( badHdr ){
            /* If the wal-index header is still malformed even while holding
            ** a WRITE lock, it can only mean that the header is corrupted and
            ** needs to be reconstructed.  So run recovery to do exactly that.
            */
            rc = walIndexRecover(pWal);
            *pChanged = 1;
          }
        }
        if( bWriteLock==0 ){
          pWal->writeLock = 0;
          walUnlockExclusive(pWal, WAL_WRITE_LOCK, 1);
        }
      }
    }
  }

  /* If the header is read successfully, check the version number to make
  ** sure the wal-index was not constructed with some future format that
  ** this version of SQLite cannot understand.
  */
................................................................................
      return walBeginShmUnreliable(pWal, pChanged);
    }
  }

  assert( pWal->nWiData>0 );
  assert( pWal->apWiData[0]!=0 );
  pInfo = walCkptInfo(pWal);
  if( !useWal && AtomicLoad(&pInfo->nBackfill)==pWal->hdr.mxFrame
#ifdef SQLITE_ENABLE_SNAPSHOT
   && (pWal->pSnapshot==0 || pWal->hdr.mxFrame==0)
#endif
  ){
    /* The WAL has been completely backfilled (or it is empty).
    ** and can be safely ignored.
    */
................................................................................
  }
  if( (pWal->readOnly & WAL_SHM_RDONLY)==0
   && (mxReadMark<mxFrame || mxI==0)
  ){
    for(i=1; i<WAL_NREADER; i++){
      rc = walLockExclusive(pWal, WAL_READ_LOCK(i), 1);
      if( rc==SQLITE_OK ){
        AtomicStore(pInfo->aReadMark+i,mxFrame);
        mxReadMark = mxFrame;
        mxI = i;
        walUnlockExclusive(pWal, WAL_READ_LOCK(i), 1);
        break;
      }else if( rc!=SQLITE_BUSY ){
        return rc;
      }
    }
................................................................................
    if( rc==SQLITE_OK ){
      void *pBuf1 = sqlite3_malloc(szPage);
      void *pBuf2 = sqlite3_malloc(szPage);
      if( pBuf1==0 || pBuf2==0 ){
        rc = SQLITE_NOMEM;
      }else{
        u32 i = pInfo->nBackfillAttempted;
        for(i=pInfo->nBackfillAttempted; i>AtomicLoad(&pInfo->nBackfill); i--){
          WalHashLoc sLoc;          /* Hash table location */
          u32 pgno;                 /* Page number in db file */
          i64 iDbOff;               /* Offset of db file entry */
          i64 iWalOff;              /* Offset of wal file entry */

          rc = walHashGet(pWal, walFramePage(i), &sLoc);
          if( rc!=SQLITE_OK ) break;
................................................................................
** Pager layer will use this to know that its cache is stale and
** needs to be flushed.
*/
SQLITE_PRIVATE int sqlite3WalBeginReadTransaction(Wal *pWal, int *pChanged){
  int rc;                         /* Return code */
  int cnt = 0;                    /* Number of TryBeginRead attempts */

  assert( pWal->ckptLock==0 );

#ifdef SQLITE_ENABLE_SNAPSHOT
  int bChanged = 0;
  WalIndexHdr *pSnapshot = pWal->pSnapshot;
  if( pSnapshot ){
    if( memcmp(pSnapshot, &pWal->hdr, sizeof(WalIndexHdr))!=0 ){
      bChanged = 1;
    }

    /* It is possible that there is a checkpointer thread running 
    ** concurrent with this code. If this is the case, it may be that the
    ** checkpointer has already determined that it will checkpoint 
    ** snapshot X, where X is later in the wal file than pSnapshot, but 
    ** has not yet set the pInfo->nBackfillAttempted variable to indicate 
    ** its intent. To avoid the race condition this leads to, ensure that
    ** there is no checkpointer process by taking a shared CKPT lock 
    ** before checking pInfo->nBackfillAttempted.  */
    (void)walEnableBlocking(pWal);
    rc = walLockShared(pWal, WAL_CKPT_LOCK);
    walDisableBlocking(pWal);

    if( rc!=SQLITE_OK ){
      return rc;
    }
    pWal->ckptLock = 1;
  }
#endif

  do{
    rc = walTryBeginRead(pWal, pChanged, 0, ++cnt);
  }while( rc==WAL_RETRY );
  testcase( (rc&0xff)==SQLITE_BUSY );
................................................................................
      **         checkpoint need not have completed for this to cause problems.
      */
      volatile WalCkptInfo *pInfo = walCkptInfo(pWal);

      assert( pWal->readLock>0 || pWal->hdr.mxFrame==0 );
      assert( pInfo->aReadMark[pWal->readLock]<=pSnapshot->mxFrame );
















      /* Check that the wal file has not been wrapped. Assuming that it has
      ** not, also check that no checkpointer has attempted to checkpoint any
      ** frames beyond pSnapshot->mxFrame. If either of these conditions are
      ** true, return SQLITE_ERROR_SNAPSHOT. Otherwise, overwrite pWal->hdr
      ** with *pSnapshot and set *pChanged as appropriate for opening the
      ** snapshot.  */
      if( !memcmp(pSnapshot->aSalt, pWal->hdr.aSalt, sizeof(pWal->hdr.aSalt))
       && pSnapshot->mxFrame>=pInfo->nBackfillAttempted
      ){
        assert( pWal->readLock>0 );
        memcpy(&pWal->hdr, pSnapshot, sizeof(WalIndexHdr));
        *pChanged = bChanged;
      }else{
        rc = SQLITE_ERROR_SNAPSHOT;
      }



      /* A client using a non-current snapshot may not ignore any frames
      ** from the start of the wal file. This is because, for a system
      ** where (minFrame < iSnapshot < maxFrame), a checkpointer may
      ** have omitted to checkpoint a frame earlier than minFrame in 
      ** the file because there exists a frame after iSnapshot that
      ** is the same database page.  */
      pWal->minFrame = 1;



      if( rc!=SQLITE_OK ){
        sqlite3WalEndReadTransaction(pWal);
      }
    }
  }

  /* Release the shared CKPT lock obtained above. */
  if( pWal->ckptLock ){
    assert( pSnapshot );
    walUnlockShared(pWal, WAL_CKPT_LOCK);
    pWal->ckptLock = 0;
  }
#endif
  return rc;
}

/*
** Finish with a read transaction.  All this does is release the
** read-lock.
................................................................................
** thread to write as doing so would cause a fork.  So this routine
** returns SQLITE_BUSY in that case and no write transaction is started.
**
** There can only be a single writer active at a time.
*/
SQLITE_PRIVATE int sqlite3WalBeginWriteTransaction(Wal *pWal){
  int rc;

#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
  /* If the write-lock is already held, then it was obtained before the
  ** read-transaction was even opened, making this call a no-op.
  ** Return early. */
  if( pWal->writeLock ){
    assert( !memcmp(&pWal->hdr,(void *)walIndexHdr(pWal),sizeof(WalIndexHdr)) );
    return SQLITE_OK;
  }
#endif

  /* Cannot start a write transaction without first holding a read
  ** transaction. */
  assert( pWal->readLock>=0 );
  assert( pWal->writeLock==0 && pWal->iReCksum==0 );

  if( pWal->readOnly ){
................................................................................
  PgHdr *pPage,               /* The page of the frame to be written */
  int nTruncate,              /* The commit flag.  Usually 0.  >0 for commit */
  sqlite3_int64 iOffset       /* Byte offset at which to write */
){
  int rc;                         /* Result code from subfunctions */
  void *pData;                    /* Data actually written */
  u8 aFrame[WAL_FRAME_HDRSIZE];   /* Buffer to assemble frame-header in */



  pData = pPage->pData;

  walEncodeFrame(p->pWal, pPage->pgno, nTruncate, pData, aFrame);
  rc = walWriteToLog(p, aFrame, sizeof(aFrame), iOffset);
  if( rc ) return rc;
  /* Write the page data */
  rc = walWriteToLog(p, pData, p->szPage, iOffset+sizeof(aFrame));
  return rc;
}
................................................................................
      assert( rc==SQLITE_OK || iWrite==0 );
      if( iWrite>=iFirst ){
        i64 iOff = walFrameOffset(iWrite, szPage) + WAL_FRAME_HDRSIZE;
        void *pData;
        if( pWal->iReCksum==0 || iWrite<pWal->iReCksum ){
          pWal->iReCksum = iWrite;
        }



        pData = p->pData;

        rc = sqlite3OsWrite(pWal->pWalFd, pData, szPage, iOff);
        if( rc ) return rc;
        p->flags &= ~PGHDR_WAL_APPEND;
        continue;
      }
    }

................................................................................

  /* EVIDENCE-OF: R-62920-47450 The busy-handler callback is never invoked
  ** in the SQLITE_CHECKPOINT_PASSIVE mode. */
  assert( eMode!=SQLITE_CHECKPOINT_PASSIVE || xBusy==0 );

  if( pWal->readOnly ) return SQLITE_READONLY;
  WALTRACE(("WAL%p: checkpoint begins\n", pWal));

  /* Enable blocking locks, if possible. If blocking locks are successfully
  ** enabled, set xBusy2=0 so that the busy-handler is never invoked. */
  sqlite3WalDb(pWal, db);
  (void)walEnableBlocking(pWal);

  /* IMPLEMENTATION-OF: R-62028-47212 All calls obtain an exclusive 
  ** "checkpoint" lock on the database file.


  ** EVIDENCE-OF: R-10421-19736 If any other process is running a
  ** checkpoint operation at the same time, the lock cannot be obtained and
  ** SQLITE_BUSY is returned.
  ** EVIDENCE-OF: R-53820-33897 Even if there is a busy-handler configured,
  ** it will not be invoked in this case.
  */
  rc = walLockExclusive(pWal, WAL_CKPT_LOCK, 1);
  testcase( rc==SQLITE_BUSY );



  testcase( rc!=SQLITE_OK && xBusy2!=0 );
  if( rc==SQLITE_OK ){
    pWal->ckptLock = 1;

    /* IMPLEMENTATION-OF: R-59782-36818 The SQLITE_CHECKPOINT_FULL, RESTART and
    ** TRUNCATE modes also obtain the exclusive "writer" lock on the database
    ** file.
    **
    ** EVIDENCE-OF: R-60642-04082 If the writer lock cannot be obtained
    ** immediately, and a busy-handler is configured, it is invoked and the
    ** writer lock retried until either the busy-handler returns 0 or the
    ** lock is successfully obtained.
    */
    if( eMode!=SQLITE_CHECKPOINT_PASSIVE ){
      rc = walBusyLock(pWal, xBusy2, pBusyArg, WAL_WRITE_LOCK, 1);
      if( rc==SQLITE_OK ){
        pWal->writeLock = 1;
      }else if( rc==SQLITE_BUSY ){
        eMode2 = SQLITE_CHECKPOINT_PASSIVE;
        xBusy2 = 0;
        rc = SQLITE_OK;
      }
    }
  }


  /* Read the wal-index header. */
  if( rc==SQLITE_OK ){
    walDisableBlocking(pWal);
    rc = walIndexReadHdr(pWal, &isChanged);
    (void)walEnableBlocking(pWal);
    if( isChanged && pWal->pDbFd->pMethods->iVersion>=3 ){
      sqlite3OsUnfetch(pWal->pDbFd, 0, 0);
    }
  }

  /* Copy data from the log to the database file. */
  if( rc==SQLITE_OK ){
................................................................................
    ** performed, then the pager-cache associated with pWal is now
    ** out of date. So zero the cached wal-index header to ensure that
    ** next time the pager opens a snapshot on this database it knows that
    ** the cache needs to be reset.
    */
    memset(&pWal->hdr, 0, sizeof(WalIndexHdr));
  }

  walDisableBlocking(pWal);
  sqlite3WalDb(pWal, 0);

  /* Release the locks. */
  sqlite3WalEndWriteTransaction(pWal);
  if( pWal->ckptLock ){
    walUnlockExclusive(pWal, WAL_CKPT_LOCK, 1);
    pWal->ckptLock = 0;
  }
  WALTRACE(("WAL%p: checkpoint %s\n", pWal, rc ? "failed" : "ok"));
#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
  if( rc==SQLITE_BUSY_TIMEOUT ) rc = SQLITE_BUSY;
#endif
  return (rc==SQLITE_OK && eMode!=eMode2 ? SQLITE_BUSY : rc);
}

/* Return the value to pass to a sqlite3_wal_hook callback, the
** number of frames in the WAL at the point of the last commit since
** sqlite3WalCallback() was called.  If no commits have occurred since
** the last call, then return 0.
................................................................................
  }

  return rc;
}

/* Try to open on pSnapshot when the next read-transaction starts
*/
SQLITE_PRIVATE void sqlite3WalSnapshotOpen(
  Wal *pWal, 
  sqlite3_snapshot *pSnapshot
){
  pWal->pSnapshot = (WalIndexHdr*)pSnapshot;
}

/* 
** Return a +ve value if snapshot p1 is newer than p2. A -ve value if
** p1 is older than p2 and zero if p1 and p2 are the same snapshot.
*/
................................................................................
#ifndef SQLITE_OMIT_AUTOVACUUM
  u8 autoVacuum;        /* True if auto-vacuum is enabled */
  u8 incrVacuum;        /* True if incr-vacuum is enabled */
  u8 bDoTruncate;       /* True to truncate db on commit */
#endif
  u8 inTransaction;     /* Transaction state */
  u8 max1bytePayload;   /* Maximum first byte of cell for a 1-byte payload */
  u8 nReserveWanted;    /* Desired number of extra bytes per page */


  u16 btsFlags;         /* Boolean parameters.  See BTS_* macros below */
  u16 maxLocal;         /* Maximum local payload in non-LEAFDATA tables */
  u16 minLocal;         /* Minimum local payload in non-LEAFDATA tables */
  u16 maxLeaf;          /* Maximum local payload in a LEAFDATA table */
  u16 minLeaf;          /* Minimum local payload in a LEAFDATA table */
  u32 pageSize;         /* Total number of bytes on a page */
  u32 usableSize;       /* Number of usable bytes on each page */
................................................................................
**
** This function is called when a free-list leaf page is removed from the
** free-list for reuse. It returns false if it is safe to retrieve the
** page from the pager layer with the 'no-content' flag set. True otherwise.
*/
static int btreeGetHasContent(BtShared *pBt, Pgno pgno){
  Bitvec *p = pBt->pHasContent;
  return p && (pgno>sqlite3BitvecSize(p) || sqlite3BitvecTestNotNull(p, pgno));
}

/*
** Clear (destroy) the BtShared.pHasContent bitvec. This should be
** invoked at the conclusion of each write-transaction.
*/
static void btreeClearHasContent(BtShared *pBt){
................................................................................
      if( iFree2>usableSize-4 ) return SQLITE_CORRUPT_PAGE(pPage);
      if( 0==iFree2 || (data[iFree2]==0 && data[iFree2+1]==0) ){
        u8 *pEnd = &data[cellOffset + nCell*2];
        u8 *pAddr;
        int sz2 = 0;
        int sz = get2byte(&data[iFree+2]);
        int top = get2byte(&data[hdr+5]);
        if( top>=iFree ){
          return SQLITE_CORRUPT_PAGE(pPage);
        }
        if( iFree2 ){
          if( iFree+sz>iFree2 ) return SQLITE_CORRUPT_PAGE(pPage);
          sz2 = get2byte(&data[iFree2+2]);
          if( iFree2+sz2 > usableSize ) return SQLITE_CORRUPT_PAGE(pPage);
          memmove(&data[iFree+sz+sz2], &data[iFree+sz], iFree2-(iFree+sz));
................................................................................
  }
  x = get2byte(&data[hdr+5]);
  if( iStart<=x ){
    /* The new freeblock is at the beginning of the cell content area,
    ** so just extend the cell content area rather than create another
    ** freelist entry */
    if( iStart<x ) return SQLITE_CORRUPT_PAGE(pPage);
    if( iPtr!=hdr+1 ) return SQLITE_CORRUPT_PAGE(pPage);
    put2byte(&data[hdr+1], iFreeBlk);
    put2byte(&data[hdr+5], iEnd);
  }else{
    /* Insert the new freeblock into the freelist */
    put2byte(&data[iPtr], iStart);
  }
  if( pPage->pBt->btsFlags & BTS_FAST_SECURE ){
................................................................................
/*
** Invoke the busy handler for a btree.
*/
static int btreeInvokeBusyHandler(void *pArg){
  BtShared *pBt = (BtShared*)pArg;
  assert( pBt->db );
  assert( sqlite3_mutex_held(pBt->db->mutex) );
  return sqlite3InvokeBusyHandler(&pBt->db->busyHandler);

}

/*
** Open a database file.
** 
** zFilename is the name of the database file.  If zFilename is NULL
** then an ephemeral database is created.  The ephemeral database might
................................................................................
** bytes per page is left unchanged.
**
** If the iFix!=0 then the BTS_PAGESIZE_FIXED flag is set so that the page size
** and autovacuum mode can no longer be changed.
*/
SQLITE_PRIVATE int sqlite3BtreeSetPageSize(Btree *p, int pageSize, int nReserve, int iFix){
  int rc = SQLITE_OK;
  int x;
  BtShared *pBt = p->pBt;
  assert( nReserve>=0 && nReserve<=255 );
  sqlite3BtreeEnter(p);

  pBt->nReserveWanted = nReserve;
  x = pBt->pageSize - pBt->usableSize;
  if( nReserve<x ) nReserve = x;
  if( pBt->btsFlags & BTS_PAGESIZE_FIXED ){
    sqlite3BtreeLeave(p);
    return SQLITE_READONLY;
  }



  assert( nReserve>=0 && nReserve<=255 );
  if( pageSize>=512 && pageSize<=SQLITE_MAX_PAGE_SIZE &&
        ((pageSize-1)&pageSize)==0 ){
    assert( (pageSize & 7)==0 );
    assert( !pBt->pCursor );
    pBt->pageSize = (u32)pageSize;
    freeTempSpace(pBt);
................................................................................
}

/*
** Return the number of bytes of space at the end of every page that
** are intentually left unused.  This is the "reserved" space that is
** sometimes used by extensions.
**
** The value returned is the larger of the current reserve size and
** the latest reserve size requested by SQLITE_FILECTRL_RESERVE_BYTES.
** The amount of reserve can only grow - never shrink.
*/
SQLITE_PRIVATE int sqlite3BtreeGetRequestedReserve(Btree *p){
  int n1, n2;
  sqlite3BtreeEnter(p);
  n1 = (int)p->pBt->nReserveWanted;
  n2 = sqlite3BtreeGetReserveNoMutex(p);



  sqlite3BtreeLeave(p);
  return n1>n2 ? n1 : n2;
}


/*
** Set the maximum page count for a database if mxPage is positive.
** No changes are made if mxPage is 0 or negative.
** Regardless of the value of mxPage, return the maximum page count.
................................................................................
** One or the other of the two processes must give way or there can be
** no progress.  By returning SQLITE_BUSY and not invoking the busy callback
** when A already has a read lock, we encourage A to give up and let B
** proceed.
*/
SQLITE_PRIVATE int sqlite3BtreeBeginTrans(Btree *p, int wrflag, int *pSchemaVersion){
  BtShared *pBt = p->pBt;
  Pager *pPager = pBt->pPager;
  int rc = SQLITE_OK;

  sqlite3BtreeEnter(p);
  btreeIntegrity(p);

  /* If the btree is already in a write-transaction, or it
  ** is already in a read-transaction and a read-transaction
................................................................................
  */
  if( p->inTrans==TRANS_WRITE || (p->inTrans==TRANS_READ && !wrflag) ){
    goto trans_begun;
  }
  assert( pBt->inTransaction==TRANS_WRITE || IfNotOmitAV(pBt->bDoTruncate)==0 );

  if( (p->db->flags & SQLITE_ResetDatabase) 
   && sqlite3PagerIsreadonly(pPager)==0 
  ){
    pBt->btsFlags &= ~BTS_READ_ONLY;
  }

  /* Write transactions are not possible on a read-only database */
  if( (pBt->btsFlags & BTS_READ_ONLY)!=0 && wrflag ){
    rc = SQLITE_READONLY;
................................................................................
  ** on page 1, the transaction cannot be opened. */
  rc = querySharedCacheTableLock(p, MASTER_ROOT, READ_LOCK);
  if( SQLITE_OK!=rc ) goto trans_begun;

  pBt->btsFlags &= ~BTS_INITIALLY_EMPTY;
  if( pBt->nPage==0 ) pBt->btsFlags |= BTS_INITIALLY_EMPTY;
  do {
    sqlite3PagerWalDb(pPager, p->db);

#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
    /* If transitioning from no transaction directly to a write transaction,
    ** block for the WRITER lock first if possible. */
    if( pBt->pPage1==0 && wrflag ){
      assert( pBt->inTransaction==TRANS_NONE );
      rc = sqlite3PagerWalWriteLock(pPager, 1);
      if( rc!=SQLITE_BUSY && rc!=SQLITE_OK ) break;
    }
#endif

    /* Call lockBtree() until either pBt->pPage1 is populated or
    ** lockBtree() returns something other than SQLITE_OK. lockBtree()
    ** may return SQLITE_OK but leave pBt->pPage1 set to 0 if after
    ** reading page 1 it discovers that the page-size of the database 
    ** file is not pBt->pageSize. In this case lockBtree() will update
    ** pBt->pageSize to the page-size of the file on disk.
    */
    while( pBt->pPage1==0 && SQLITE_OK==(rc = lockBtree(pBt)) );

    if( rc==SQLITE_OK && wrflag ){
      if( (pBt->btsFlags & BTS_READ_ONLY)!=0 ){
        rc = SQLITE_READONLY;
      }else{
        rc = sqlite3PagerBegin(pPager, wrflag>1, sqlite3TempInMemory(p->db));
        if( rc==SQLITE_OK ){
          rc = newDatabase(pBt);
        }else if( rc==SQLITE_BUSY_SNAPSHOT && pBt->inTransaction==TRANS_NONE ){
          /* if there was no transaction opened when this function was
          ** called and SQLITE_BUSY_SNAPSHOT is returned, change the error
          ** code to SQLITE_BUSY. */
          rc = SQLITE_BUSY;
        }
      }
    }
  
    if( rc!=SQLITE_OK ){
      (void)sqlite3PagerWalWriteLock(pPager, 0);
      unlockBtreeIfUnused(pBt);
    }
  }while( (rc&0xFF)==SQLITE_BUSY && pBt->inTransaction==TRANS_NONE &&
          btreeInvokeBusyHandler(pBt) );
  sqlite3PagerWalDb(pPager, 0);
#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
  if( rc==SQLITE_BUSY_TIMEOUT ) rc = SQLITE_BUSY;
#endif

  if( rc==SQLITE_OK ){
    if( p->inTrans==TRANS_NONE ){
      pBt->nTransaction++;
#ifndef SQLITE_OMIT_SHARED_CACHE
      if( p->sharable ){
        assert( p->lock.pBtree==p && p->lock.iTable==1 );
................................................................................
      *pSchemaVersion = get4byte(&pBt->pPage1->aData[40]);
    }
    if( wrflag ){
      /* This call makes sure that the pager has the correct number of
      ** open savepoints. If the second parameter is greater than 0 and
      ** the sub-journal is not already open, then it will be opened here.
      */
      rc = sqlite3PagerOpenSavepoint(pPager, p->db->nSavepoint);
    }
  }

  btreeIntegrity(p);
  sqlite3BtreeLeave(p);
  return rc;
}
................................................................................
  memcpy(pTmp, aData, pPg->pBt->usableSize);
#endif

  /* Remove cells from the start and end of the page */
  assert( nCell>=0 );
  if( iOld<iNew ){
    int nShift = pageFreeArray(pPg, iOld, iNew-iOld, pCArray);
    if( NEVER(nShift>nCell) ) return SQLITE_CORRUPT_BKPT;
    memmove(pPg->aCellIdx, &pPg->aCellIdx[nShift*2], nCell*2);
    nCell -= nShift;
  }
  if( iNewEnd < iOldEnd ){
    int nTail = pageFreeArray(pPg, iNewEnd, iOldEnd - iNewEnd, pCArray);
    assert( nCell>=nTail );
    nCell -= nTail;
................................................................................
    }
#endif
  }
  sqlite3BtreeLeave(p);
  return rc;
}


/*
** The first argument, pCur, is a cursor opened on some b-tree. Count the
** number of entries in the b-tree and write the result to *pnEntry.
**
** SQLITE_OK is returned if the operation is successfully executed. 
** Otherwise, if an error is encountered (i.e. an IO error or database
** corruption) an SQLite error code is returned.
................................................................................
    *pnEntry = 0;
    return SQLITE_OK;
  }

  /* Unless an error occurs, the following loop runs one iteration for each
  ** page in the B-Tree structure (not including overflow pages). 
  */
  while( rc==SQLITE_OK && !AtomicLoad(&db->u1.isInterrupted) ){
    int iIdx;                          /* Index of child node in parent */
    MemPage *pPage;                    /* Current page of the b-tree */

    /* If this is a leaf page or the tree is not an int-key tree, then 
    ** this page contains countable entries. Increment the entry counter
    ** accordingly.
    */
................................................................................
      rc = moveToChild(pCur, get4byte(findCell(pPage, iIdx)));
    }
  }

  /* An error has occurred. Return an error code. */
  return rc;
}


/*
** Return the pager associated with a BTree.  This routine is used for
** testing and debugging only.
*/
SQLITE_PRIVATE Pager *sqlite3BtreePager(Btree *p){
  return p->pBt->pPager;
................................................................................
    checkAppendMsg(pCheck, "invalid page number %d", iPage);
    return 1;
  }
  if( getPageReferenced(pCheck, iPage) ){
    checkAppendMsg(pCheck, "2nd reference to page %d", iPage);
    return 1;
  }
  if( AtomicLoad(&pCheck->db->u1.isInterrupted) ) return 1;
  setPageReferenced(pCheck, iPage);
  return 0;
}

#ifndef SQLITE_OMIT_AUTOVACUUM
/*
** Check that the entry in the pointer-map for page iChild maps to 
................................................................................

/*
** Attempt to set the page size of the destination to match the page size
** of the source.
*/
static int setDestPgsz(sqlite3_backup *p){
  int rc;
  rc = sqlite3BtreeSetPageSize(p->pDest,sqlite3BtreeGetPageSize(p->pSrc),0,0);
  return rc;
}

/*
** Check that there is no open read-transaction on the b-tree passed as the
** second argument. If there is not, return SQLITE_OK. Otherwise, if there
** is an open read-transaction, return SQLITE_ERROR and leave an error 
................................................................................
  int bUpdate                     /* True for an update, false otherwise */
){
  Pager * const pDestPager = sqlite3BtreePager(p->pDest);
  const int nSrcPgsz = sqlite3BtreeGetPageSize(p->pSrc);
  int nDestPgsz = sqlite3BtreeGetPageSize(p->pDest);
  const int nCopy = MIN(nSrcPgsz, nDestPgsz);
  const i64 iEnd = (i64)iSrcPg*(i64)nSrcPgsz;







  int rc = SQLITE_OK;
  i64 iOff;

  assert( sqlite3BtreeGetReserveNoMutex(p->pSrc)>=0 );
  assert( p->bDestLocked );
  assert( !isFatalError(p->rc) );
  assert( iSrcPg!=PENDING_BYTE_PAGE(p->pSrc->pBt) );
................................................................................
  /* Catch the case where the destination is an in-memory database and the
  ** page sizes of the source and destination differ. 
  */
  if( nSrcPgsz!=nDestPgsz && sqlite3PagerIsMemdb(pDestPager) ){
    rc = SQLITE_READONLY;
  }





















  /* This loop runs once for each destination page spanned by the source 
  ** page. For each iteration, variable iOff is set to the byte offset
  ** of the destination page.
  */
  for(iOff=iEnd-(i64)nSrcPgsz; rc==SQLITE_OK && iOff<iEnd; iOff+=nDestPgsz){
    DbPage *pDestPg = 0;
    Pgno iDest = (Pgno)(iOff/nDestPgsz)+1;
................................................................................
  */
  memset(&b, 0, sizeof(b));
  b.pSrcDb = pFrom->db;
  b.pSrc = pFrom;
  b.pDest = pTo;
  b.iNext = 1;





  /* 0x7FFFFFFF is the hard limit for the number of pages in a database
  ** file. By passing this as the number of pages to copy to
  ** sqlite3_backup_step(), we can guarantee that the copy finishes 
  ** within a single call (unless an error occurs). The assert() statement
  ** checks this assumption - (p->rc) should be set to either SQLITE_DONE 
  ** or an error code.  */
  sqlite3_backup_step(&b, 0x7FFFFFFF);
................................................................................
  for(i=1, pX=pVdbe->aMem+1; i<pVdbe->nMem; i++, pX++){
    if( pX->pScopyFrom==pMem ){
      u16 mFlags;
      if( pVdbe->db->flags & SQLITE_VdbeTrace ){
        sqlite3DebugPrintf("Invalidate R[%d] due to change in R[%d]\n",
          (int)(pX - pVdbe->aMem), (int)(pMem - pVdbe->aMem));
      }
      /* If pX is marked as a shallow copy of pMem, then try to verify that
      ** no significant changes have been made to pX since the OP_SCopy.
      ** A significant change would indicated a missed call to this
      ** function for pX.  Minor changes, such as adding or removing a
      ** dual type, are allowed, as long as the underlying value is the
      ** same. */
      mFlags = pMem->flags & pX->flags & pX->mScopyFlags;
      assert( (mFlags&(MEM_Int|MEM_IntReal))==0 || pMem->u.i==pX->u.i );





      
      /* pMem is the register that is changing.  But also mark pX as
      ** undefined so that we can quickly detect the shallow-copy error */
      pX->flags = MEM_Undefined;
      pX->pScopyFrom = 0;
    }
  }
................................................................................
** pMem->zMalloc space will be allocated if necessary.  The calling routine
** is responsible for making sure that the pMem object is eventually
** destroyed.
**
** If this routine fails for any reason (malloc returns NULL or unable
** to read from the disk) then the pMem is left in an inconsistent state.
*/
SQLITE_PRIVATE int sqlite3VdbeMemFromBtree(
  BtCursor *pCur,   /* Cursor pointing at record to retrieve. */
  u32 offset,       /* Offset from the start of data to return bytes from. */
  u32 amt,          /* Number of bytes to return. */
  Mem *pMem         /* OUT: Return data in this Mem structure. */
){
  int rc;
  pMem->flags = MEM_Null;
................................................................................
      pMem->n = (int)amt;
    }else{
      sqlite3VdbeMemRelease(pMem);
    }
  }
  return rc;
}
SQLITE_PRIVATE int sqlite3VdbeMemFromBtreeZeroOffset(
  BtCursor *pCur,   /* Cursor pointing at record to retrieve. */

  u32 amt,          /* Number of bytes to return. */
  Mem *pMem         /* OUT: Return data in this Mem structure. */
){

  u32 available = 0;  /* Number of bytes available on the local btree page */
  int rc = SQLITE_OK; /* Return code */

  assert( sqlite3BtreeCursorIsValid(pCur) );
  assert( !VdbeMemDynamic(pMem) );

  /* Note: the calls to BtreeKeyFetch() and DataFetch() below assert() 
  ** that both the BtShared and database handle mutexes are held. */
  assert( !sqlite3VdbeMemIsRowSet(pMem) );
  pMem->z = (char *)sqlite3BtreePayloadFetch(pCur, &available);
  assert( pMem->z!=0 );

  if( amt<=available ){

    pMem->flags = MEM_Blob|MEM_Ephem;
    pMem->n = (int)amt;
  }else{
    rc = sqlite3VdbeMemFromBtree(pCur, 0, amt, pMem);
  }

  return rc;
}

/*
** The pVal argument is known to be a value other than NULL.
................................................................................
SQLITE_PRIVATE void sqlite3ExplainBreakpoint(const char *z1, const char *z2){
  (void)z1;
  (void)z2;
}
#endif

/*
** Add a new OP_Explain opcode.
**
** If the bPush flag is true, then make this opcode the parent for
** subsequent Explains until sqlite3VdbeExplainPop() is called.
*/
SQLITE_PRIVATE void sqlite3VdbeExplain(Parse *pParse, u8 bPush, const char *zFmt, ...){
#ifndef SQLITE_DEBUG
  /* Always include the OP_Explain opcodes if SQLITE_DEBUG is defined.
................................................................................
** Change the P2 operand of instruction addr so that it points to
** the address of the next instruction to be coded.
*/
SQLITE_PRIVATE void sqlite3VdbeJumpHere(Vdbe *p, int addr){
  sqlite3VdbeChangeP2(p, addr, p->nOp);
}

/*
** Change the P2 operand of the jump instruction at addr so that
** the jump lands on the next opcode.  Or if the jump instruction was
** the previous opcode (and is thus a no-op) then simply back up
** the next instruction counter by one slot so that the jump is
** overwritten by the next inserted opcode.
**
** This routine is an optimization of sqlite3VdbeJumpHere() that
** strives to omit useless byte-code like this:
**
**        7   Once 0 8 0
**        8   ...
*/
SQLITE_PRIVATE void sqlite3VdbeJumpHereOrPopInst(Vdbe *p, int addr){
  if( addr==p->nOp-1 ){
    assert( p->aOp[addr].opcode==OP_Once
         || p->aOp[addr].opcode==OP_If
         || p->aOp[addr].opcode==OP_FkIfZero );
    assert( p->aOp[addr].p4type==0 );
#ifdef SQLITE_VDBE_COVERAGE
    sqlite3VdbeGetOp(p,-1)->iSrcLine = 0;  /* Erase VdbeCoverage() macros */
#endif
    p->nOp--;
  }else{
    sqlite3VdbeChangeP2(p, addr, p->nOp);
  }
}


/*
** If the input FuncDef structure is ephemeral, then free it.  If
** the FuncDef is not ephermal, then do nothing.
*/
static void freeEphemeralFunction(sqlite3 *db, FuncDef *pDef){
  if( (pDef->funcFlags & SQLITE_FUNC_EPHEM)!=0 ){
................................................................................
** Some translation occurs:
**
**       "PX"      ->  "r[X]"
**       "PX@PY"   ->  "r[X..X+Y-1]"  or "r[x]" if y is 0 or 1
**       "PX@PY+1" ->  "r[X..X+Y]"    or "r[x]" if y is 0
**       "PY..PY"  ->  "r[X..Y]"      or "r[x]" if y<=x
*/
SQLITE_PRIVATE char *sqlite3VdbeDisplayComment(
  sqlite3 *db,       /* Optional - Oom error reporting only */
  const Op *pOp,     /* The opcode to be commented */
  const char *zP4    /* Previously obtained value for P4 */


){
  const char *zOpName;
  const char *zSynopsis;
  int nOpName;
  int ii;
  char zAlt[50];
  StrAccum x;

  sqlite3StrAccumInit(&x, 0, 0, 0, SQLITE_MAX_LENGTH);
  zOpName = sqlite3OpcodeName(pOp->opcode);
  nOpName = sqlite3Strlen30(zOpName);
  if( zOpName[nOpName+1] ){
    int seenCom = 0;
    char c;
    zSynopsis = zOpName += nOpName + 1;
    if( strncmp(zSynopsis,"IF ",3)==0 ){
................................................................................
      if( pOp->p5 & SQLITE_STOREP2 ){
        sqlite3_snprintf(sizeof(zAlt), zAlt, "r[P2] = (%s)", zSynopsis+3);
      }else{
        sqlite3_snprintf(sizeof(zAlt), zAlt, "if %s goto P2", zSynopsis+3);
      }
      zSynopsis = zAlt;
    }
    for(ii=0; (c = zSynopsis[ii])!=0; ii++){
      if( c=='P' ){
        c = zSynopsis[++ii];
        if( c=='4' ){
          sqlite3_str_appendall(&x, zP4);
        }else if( c=='X' ){
          sqlite3_str_appendall(&x, pOp->zComment);
          seenCom = 1;
        }else{
          int v1 = translateP(c, pOp);
          int v2;

          if( strncmp(zSynopsis+ii+1, "@P", 2)==0 ){
            ii += 3;

            v2 = translateP(zSynopsis[ii], pOp);
            if( strncmp(zSynopsis+ii+1,"+1",2)==0 ){
              ii += 2;
              v2++;
            }
            if( v2<2 ){
              sqlite3_str_appendf(&x, "%d", v1);
            }else{
              sqlite3_str_appendf(&x, "%d..%d", v1, v1+v2-1);
            }
          }else if( strncmp(zSynopsis+ii+1, "@NP", 3)==0 ){
            sqlite3_context *pCtx = pOp->p4.pCtx;
            if( pOp->p4type!=P4_FUNCCTX || pCtx->argc==1 ){
              sqlite3_str_appendf(&x, "%d", v1);
            }else if( pCtx->argc>1 ){
              sqlite3_str_appendf(&x, "%d..%d", v1, v1+pCtx->argc-1);
            }else{
              assert( x.nChar>2 );
              x.nChar -= 2;
              ii++;
            }
            ii += 3;
          }else{
            sqlite3_str_appendf(&x, "%d", v1);
            if( strncmp(zSynopsis+ii+1, "..P3", 4)==0 && pOp->p3==0 ){
              ii += 4;
            }
          }

        }
      }else{

        sqlite3_str_appendchar(&x, 1, c);
      }
    }
    if( !seenCom && pOp->zComment ){
      sqlite3_str_appendf(&x, "; %s", pOp->zComment);

    }

  }else if( pOp->zComment ){
    sqlite3_str_appendall(&x, pOp->zComment);




  }

  if( (x.accError & SQLITE_NOMEM)!=0 && db!=0 ){
    sqlite3OomFault(db);
  }
  return sqlite3StrAccumFinish(&x);
}
#endif /* SQLITE_ENABLE_EXPLAIN_COMMENTS */

#if VDBE_DISPLAY_P4 && defined(SQLITE_ENABLE_CURSOR_HINTS)
/*
** Translate the P4.pExpr value for an OP_CursorHint opcode into text
** that can be displayed in the P4 column of EXPLAIN output.
*/
static void displayP4Expr(StrAccum *p, Expr *pExpr){
................................................................................


#if VDBE_DISPLAY_P4
/*
** Compute a string that describes the P4 parameter for an opcode.
** Use zTemp for any required temporary buffer space.
*/
SQLITE_PRIVATE char *sqlite3VdbeDisplayP4(sqlite3 *db, Op *pOp){
  char *zP4 = 0;
  StrAccum x;


  sqlite3StrAccumInit(&x, 0, 0, 0, SQLITE_MAX_LENGTH);
  switch( pOp->p4type ){
    case P4_KEYINFO: {
      int j;
      KeyInfo *pKeyInfo = pOp->p4.pKeyInfo;
      assert( pKeyInfo->aSortFlags!=0 );
      sqlite3_str_appendf(&x, "k(%d", pKeyInfo->nKeyField);
      for(j=0; j<pKeyInfo->nKeyField; j++){
................................................................................
#ifdef SQLITE_ENABLE_CURSOR_HINTS
    case P4_EXPR: {
      displayP4Expr(&x, pOp->p4.pExpr);
      break;
    }
#endif
    case P4_COLLSEQ: {
      static const char *const encnames[] = {"?", "8", "16LE", "16BE"};
      CollSeq *pColl = pOp->p4.pColl;
      assert( pColl->enc>=0 && pColl->enc<4 );
      sqlite3_str_appendf(&x, "%.18s-%s", pColl->zName,
                          encnames[pColl->enc]);
      break;
    }
    case P4_FUNCDEF: {
      FuncDef *pDef = pOp->p4.pFunc;
      sqlite3_str_appendf(&x, "%s(%d)", pDef->zName, pDef->nArg);
      break;
    }
................................................................................
#endif
    case P4_INTARRAY: {
      int i;
      int *ai = pOp->p4.ai;
      int n = ai[0];   /* The first element of an INTARRAY is always the
                       ** count of the number of elements to follow */
      for(i=1; i<=n; i++){
        sqlite3_str_appendf(&x, "%c%d", (i==1 ? '[' : ','), ai[i]);
      }

      sqlite3_str_append(&x, "]", 1);
      break;
    }
    case P4_SUBPROGRAM: {
      zP4 = "program";
      break;
    }
    case P4_DYNBLOB:
    case P4_ADVANCE: {

      break;
    }
    case P4_TABLE: {
      zP4 = pOp->p4.pTab->zName;
      break;
    }
    default: {
      zP4 = pOp->p4.z;



    }
  }
  if( zP4 ) sqlite3_str_appendall(&x, zP4);
  if( (x.accError & SQLITE_NOMEM)!=0 ){
    sqlite3OomFault(db);
  }
  return sqlite3StrAccumFinish(&x);


}
#endif /* VDBE_DISPLAY_P4 */

/*
** Declare to the Vdbe that the BTree object at db->aDb[i] is used.
**
** The prepared statements need to know in advance the complete set of
................................................................................

#if defined(VDBE_PROFILE) || defined(SQLITE_DEBUG)
/*
** Print a single opcode.  This routine is used for debugging only.
*/
SQLITE_PRIVATE void sqlite3VdbePrintOp(FILE *pOut, int pc, VdbeOp *pOp){
  char *zP4;
  char *zCom;
  sqlite3 dummyDb;
  static const char *zFormat1 = "%4d %-13s %4d %4d %4d %-13s %.2X %s\n";
  if( pOut==0 ) pOut = stdout;
  sqlite3BeginBenignMalloc();
  dummyDb.mallocFailed = 1;
  zP4 = sqlite3VdbeDisplayP4(&dummyDb, pOp);
#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS

  zCom = sqlite3VdbeDisplayComment(0, pOp, zP4);
#else
  zCom = 0;
#endif
  /* NB:  The sqlite3OpcodeName() function is implemented by code created
  ** by the mkopcodeh.awk and mkopcodec.awk scripts which extract the
  ** information from the vdbe.c source text */
  fprintf(pOut, zFormat1, pc, 
      sqlite3OpcodeName(pOp->opcode), pOp->p1, pOp->p2, pOp->p3, 
      zP4 ? zP4 : "", pOp->p5,
      zCom ? zCom : ""
  );
  fflush(pOut);
  sqlite3_free(zP4);
  sqlite3_free(zCom);
  sqlite3EndBenignMalloc();
}
#endif

/*
** Initialize an array of N Mem element.
*/
static void initMemArray(Mem *p, int N, sqlite3 *db, u16 flags){
................................................................................
SQLITE_PRIVATE void sqlite3VdbeFrameMemDel(void *pArg){
  VdbeFrame *pFrame = (VdbeFrame*)pArg;
  assert( sqlite3VdbeFrameIsValid(pFrame) );
  pFrame->pParent = pFrame->v->pDelFrame;
  pFrame->v->pDelFrame = pFrame;
}

#if defined(SQLITE_ENABLE_BYTECODE_VTAB) || !defined(SQLITE_OMIT_EXPLAIN)
/*
** Locate the next opcode to be displayed in EXPLAIN or EXPLAIN
** QUERY PLAN output.
**
** Return SQLITE_ROW on success.  Return SQLITE_DONE if there are no
** more opcodes to be displayed.
*/
SQLITE_PRIVATE int sqlite3VdbeNextOpcode(
  Vdbe *p,         /* The statement being explained */
  Mem *pSub,       /* Storage for keeping track of subprogram nesting */
  int eMode,       /* 0: normal.  1: EQP.  2:  TablesUsed */
  int *piPc,       /* IN/OUT: Current rowid.  Overwritten with next rowid */
  int *piAddr,     /* OUT: Write index into (*paOp)[] here */
  Op **paOp        /* OUT: Write the opcode array here */
){
  int nRow;                            /* Stop when row count reaches this */
  int nSub = 0;                        /* Number of sub-vdbes seen so far */
  SubProgram **apSub = 0;              /* Array of sub-vdbes */
  int i;                               /* Next instruction address */
  int rc = SQLITE_OK;                  /* Result code */
  Op *aOp = 0;                         /* Opcode array */
  int iPc;                             /* Rowid.  Copy of value in *piPc */

  /* When the number of output rows reaches nRow, that means the
  ** listing has finished and sqlite3_step() should return SQLITE_DONE.
  ** nRow is the sum of the number of rows in the main program, plus
  ** the sum of the number of rows in all trigger subprograms encountered
  ** so far.  The nRow value will increase as new trigger subprograms are
  ** encountered, but p->pc will eventually catch up to nRow.
  */
  nRow = p->nOp;
  if( pSub!=0 ){
    if( pSub->flags&MEM_Blob ){
      /* pSub is initiallly NULL.  It is initialized to a BLOB by
      ** the P4_SUBPROGRAM processing logic below */
      nSub = pSub->n/sizeof(Vdbe*);
      apSub = (SubProgram **)pSub->z;
    }
    for(i=0; i<nSub; i++){
      nRow += apSub[i]->nOp;
    }
  }
  iPc = *piPc;
  while(1){  /* Loop exits via break */
    i = iPc++;
    if( i>=nRow ){
      p->rc = SQLITE_OK;
      rc = SQLITE_DONE;
      break;
    }
    if( i<p->nOp ){
      /* The rowid is small enough that we are still in the
      ** main program. */
      aOp = p->aOp;
    }else{
      /* We are currently listing subprograms.  Figure out which one and
      ** pick up the appropriate opcode. */
      int j;
      i -= p->nOp;
      assert( apSub!=0 );
      assert( nSub>0 );
      for(j=0; i>=apSub[j]->nOp; j++){
        i -= apSub[j]->nOp;
        assert( i<apSub[j]->nOp || j+1<nSub );
      }
      aOp = apSub[j]->aOp;
    }

    /* When an OP_Program opcode is encounter (the only opcode that has
    ** a P4_SUBPROGRAM argument), expand the size of the array of subprograms
    ** kept in p->aMem[9].z to hold the new program - assuming this subprogram
    ** has not already been seen.
    */
    if( pSub!=0 && aOp[i].p4type==P4_SUBPROGRAM ){
      int nByte = (nSub+1)*sizeof(SubProgram*);
      int j;
      for(j=0; j<nSub; j++){
        if( apSub[j]==aOp[i].p4.pProgram ) break;
      }
      if( j==nSub ){
        p->rc = sqlite3VdbeMemGrow(pSub, nByte, nSub!=0);
        if( p->rc!=SQLITE_OK ){
          rc = SQLITE_ERROR;
          break;
        }
        apSub = (SubProgram **)pSub->z;
        apSub[nSub++] = aOp[i].p4.pProgram;
        MemSetTypeFlag(pSub, MEM_Blob);
        pSub->n = nSub*sizeof(SubProgram*);
        nRow += aOp[i].p4.pProgram->nOp;
      }
    }
    if( eMode==0 ) break;
#ifdef SQLITE_ENABLE_BYTECODE_VTAB
    if( eMode==2 ){
      Op *pOp = aOp + i;
      if( pOp->opcode==OP_OpenRead ) break;
      if( pOp->opcode==OP_OpenWrite && (pOp->p5 & OPFLAG_P2ISREG)==0 ) break;
      if( pOp->opcode==OP_ReopenIdx ) break;      
    }else
#endif
    {
      assert( eMode==1 );
      if( aOp[i].opcode==OP_Explain ) break;
      if( aOp[i].opcode==OP_Init && iPc>1 ) break;
    }
  }
  *piPc = iPc;
  *piAddr = i;
  *paOp = aOp;
  return rc;
}
#endif /* SQLITE_ENABLE_BYTECODE_VTAB || !SQLITE_OMIT_EXPLAIN */


/*
** Delete a VdbeFrame object and its contents. VdbeFrame objects are
** allocated by the OP_Program opcode in sqlite3VdbeExec().
*/
SQLITE_PRIVATE void sqlite3VdbeFrameDelete(VdbeFrame *p){
  int i;
................................................................................
**
** When p->explain==1, first the main program is listed, then each of
** the trigger subprograms are listed one by one.
*/
SQLITE_PRIVATE int sqlite3VdbeList(
  Vdbe *p                   /* The VDBE */
){



  Mem *pSub = 0;                       /* Memory cell hold array of subprogs */
  sqlite3 *db = p->db;                 /* The database connection */
  int i;                               /* Loop counter */
  int rc = SQLITE_OK;                  /* Return code */
  Mem *pMem = &p->aMem[1];             /* First Mem of result set */
  int bListSubprogs = (p->explain==1 || (db->flags & SQLITE_TriggerEQP)!=0);
  Op *aOp;                             /* Array of opcodes */
  Op *pOp;                             /* Current opcode */

  assert( p->explain );
  assert( p->magic==VDBE_MAGIC_RUN );
  assert( p->rc==SQLITE_OK || p->rc==SQLITE_BUSY || p->rc==SQLITE_NOMEM );

  /* Even though this opcode does not use dynamic strings for
  ** the result, result columns may become dynamic if the user calls
................................................................................
  if( p->rc==SQLITE_NOMEM ){
    /* This happens if a malloc() inside a call to sqlite3_column_text() or
    ** sqlite3_column_text16() failed.  */
    sqlite3OomFault(db);
    return SQLITE_ERROR;
  }









  if( bListSubprogs ){
    /* The first 8 memory cells are used for the result set.  So we will
    ** commandeer the 9th cell to use as storage for an array of pointers
    ** to trigger subprograms.  The VDBE is guaranteed to have at least 9
    ** cells.  */
    assert( p->nMem>9 );
    pSub = &p->aMem[9];






















  }else{
























    pSub = 0;




  }






  /* Figure out which opcode is next to display */
  rc = sqlite3VdbeNextOpcode(p, pSub, p->explain==2, &p->pc, &i, &aOp);






  if( rc==SQLITE_OK ){
    pOp = aOp + i;
    if( AtomicLoad(&db->u1.isInterrupted) ){
      p->rc = SQLITE_INTERRUPT;
      rc = SQLITE_ERROR;
      sqlite3VdbeError(p, sqlite3ErrStr(p->rc));
    }else{

      char *zP4 = sqlite3VdbeDisplayP4(db, pOp);
      if( p->explain==2 ){





        sqlite3VdbeMemSetInt64(pMem, pOp->p1);
        sqlite3VdbeMemSetInt64(pMem+1, pOp->p2);
        sqlite3VdbeMemSetInt64(pMem+2, pOp->p3);
        sqlite3VdbeMemSetStr(pMem+3, zP4, -1, SQLITE_UTF8, sqlite3_free);     
        p->nResColumn = 4;
      }else{
        sqlite3VdbeMemSetInt64(pMem+0, i);
        sqlite3VdbeMemSetStr(pMem+1, (char*)sqlite3OpcodeName(pOp->opcode),


                             -1, SQLITE_UTF8, SQLITE_STATIC);


        sqlite3VdbeMemSetInt64(pMem+2, pOp->p1);
        sqlite3VdbeMemSetInt64(pMem+3, pOp->p2);
        sqlite3VdbeMemSetInt64(pMem+4, pOp->p3);
        /* pMem+5 for p4 is done last */
        sqlite3VdbeMemSetInt64(pMem+6, pOp->p5);
#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
        {



          char *zCom = sqlite3VdbeDisplayComment(db, pOp, zP4);
          sqlite3VdbeMemSetStr(pMem+7, zCom, -1, SQLITE_UTF8, sqlite3_free);
        }

















#else







        sqlite3VdbeMemSetNull(pMem+7);


#endif
        sqlite3VdbeMemSetStr(pMem+5, zP4, -1, SQLITE_UTF8, sqlite3_free);
        p->nResColumn = 8;
      }








      p->pResultSet = pMem;
      if( db->mallocFailed ){
        p->rc = SQLITE_NOMEM;



        rc = SQLITE_ERROR;
      }else{






        p->rc = SQLITE_OK;
        rc = SQLITE_ROW;
      }
    }
  }
  return rc;
}
#endif /* SQLITE_OMIT_EXPLAIN */

#ifdef SQLITE_DEBUG
................................................................................
  if( pParse->explain ){
    static const char * const azColName[] = {
       "addr", "opcode", "p1", "p2", "p3", "p4", "p5", "comment",
       "id", "parent", "notused", "detail"
    };
    int iFirst, mx, i;
    if( nMem<10 ) nMem = 10;
    p->explain = pParse->explain;
    if( pParse->explain==2 ){
      sqlite3VdbeSetNumCols(p, 4);
      iFirst = 8;
      mx = 12;
    }else{
      sqlite3VdbeSetNumCols(p, 8);
      iFirst = 0;
................................................................................
      p->anExec = allocSpace(&x, p->anExec, p->nOp*sizeof(i64));
#endif
    }
  }

  p->pVList = pParse->pVList;
  pParse->pVList =  0;

  if( db->mallocFailed ){
    p->nVar = 0;
    p->nCursor = 0;
    p->nMem = 0;
  }else{
    p->nCursor = nCursor;
    p->nVar = (ynVar)nVar;
................................................................................
    i64 offset = 0;
    int res;
    int retryCount = 0;
    int nMainFile;

    /* Select a master journal file name */
    nMainFile = sqlite3Strlen30(zMainFile);
    zMaster = sqlite3MPrintf(db, "%.4c%s%.16c", 0,zMainFile,0);
    if( zMaster==0 ) return SQLITE_NOMEM_BKPT;
    zMaster += 4;
    do {
      u32 iRandom;
      if( retryCount ){
        if( retryCount>100 ){
          sqlite3_log(SQLITE_FULL, "MJ delete: %s", zMaster);
          sqlite3OsDelete(pVfs, zMaster, 0);
          break;
................................................................................
      /* Open the master journal. */
      rc = sqlite3OsOpenMalloc(pVfs, zMaster, &pMaster, 
          SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE|
          SQLITE_OPEN_EXCLUSIVE|SQLITE_OPEN_MASTER_JOURNAL, 0
      );
    }
    if( rc!=SQLITE_OK ){
      sqlite3DbFree(db, zMaster-4);
      return rc;
    }
 
    /* Write the name of each database file in the transaction into the new
    ** master journal file. If an error occurs at this point close
    ** and delete the master journal file. All the individual journal files
    ** still have 'null' as the master journal pointer, so they will roll
................................................................................
        }
        assert( zFile[0]!=0 );
        rc = sqlite3OsWrite(pMaster, zFile, sqlite3Strlen30(zFile)+1, offset);
        offset += sqlite3Strlen30(zFile)+1;
        if( rc!=SQLITE_OK ){
          sqlite3OsCloseFree(pMaster);
          sqlite3OsDelete(pVfs, zMaster, 0);
          sqlite3DbFree(db, zMaster-4);
          return rc;
        }
      }
    }

    /* Sync the master journal file. If the IOCAP_SEQUENTIAL device
    ** flag is set this is not required.
    */
    if( 0==(sqlite3OsDeviceCharacteristics(pMaster)&SQLITE_IOCAP_SEQUENTIAL)
     && SQLITE_OK!=(rc = sqlite3OsSync(pMaster, SQLITE_SYNC_NORMAL))
    ){
      sqlite3OsCloseFree(pMaster);
      sqlite3OsDelete(pVfs, zMaster, 0);
      sqlite3DbFree(db, zMaster-4);
      return rc;
    }

    /* Sync all the db files involved in the transaction. The same call
    ** sets the master journal pointer in each individual journal. If
    ** an error occurs here, do not delete the master journal file.
    **
................................................................................
      if( pBt ){
        rc = sqlite3BtreeCommitPhaseOne(pBt, zMaster);
      }
    }
    sqlite3OsCloseFree(pMaster);
    assert( rc!=SQLITE_BUSY );
    if( rc!=SQLITE_OK ){
      sqlite3DbFree(db, zMaster-4);
      return rc;
    }

    /* Delete the master journal file. This commits the transaction. After
    ** doing this the directory is synced again before any individual
    ** transaction files are deleted.
    */
    rc = sqlite3OsDelete(pVfs, zMaster, 1);
    sqlite3DbFree(db, zMaster-4);
    zMaster = 0;
    if( rc ){
      return rc;
    }

    /* All files and directories have already been synced, so the following
    ** calls to sqlite3BtreeCommitPhaseTwo() are only closing files and
................................................................................
** not been deleted out from under the cursor, then this routine is a no-op.
*/
SQLITE_PRIVATE int sqlite3VdbeCursorMoveto(VdbeCursor **pp, int *piCol){
  VdbeCursor *p = *pp;
  assert( p->eCurType==CURTYPE_BTREE || p->eCurType==CURTYPE_PSEUDO );
  if( p->deferredMoveto ){
    int iMap;
    if( p->aAltMap && (iMap = p->aAltMap[1+*piCol])>0 && !p->nullRow ){
      *pp = p->pAltCursor;
      *piCol = iMap - 1;
      return SQLITE_OK;
    }
    return sqlite3VdbeFinishMoveto(p);
  }
  if( sqlite3BtreeCursorHasMoved(p->uc.pCursor) ){
................................................................................
          rc = sqlite3IntFloatCompare(mem1.u.i, pRhs->u.r);
        }
      }
    }

    /* RHS is a string */
    else if( pRhs->flags & MEM_Str ){
      getVarint32NR(&aKey1[idx1], serial_type);
      testcase( serial_type==12 );
      if( serial_type<12 ){
        rc = -1;
      }else if( !(serial_type & 0x01) ){
        rc = +1;
      }else{
        mem1.n = (serial_type - 12) / 2;
................................................................................
        }
      }
    }

    /* RHS is a blob */
    else if( pRhs->flags & MEM_Blob ){
      assert( (pRhs->flags & MEM_Zero)==0 || pRhs->n==0 );
      getVarint32NR(&aKey1[idx1], serial_type);
      testcase( serial_type==12 );
      if( serial_type<12 || (serial_type & 0x01) ){
        rc = -1;
      }else{
        int nStr = (serial_type - 12) / 2;
        testcase( (d1+nStr)==(unsigned)nKey1 );
        testcase( (d1+nStr+1)==(unsigned)nKey1 );
................................................................................
){
  const u8 *aKey1 = (const u8*)pKey1;
  int serial_type;
  int res;

  assert( pPKey2->aMem[0].flags & MEM_Str );
  vdbeAssertFieldCountWithinLimits(nKey1, pKey1, pPKey2->pKeyInfo);
  serial_type = (u8)(aKey1[1]);
  if( serial_type >= 0x80 ){
    sqlite3GetVarint32(&aKey1[1], (u32*)&serial_type);
  }
  if( serial_type<12 ){
    res = pPKey2->r1;      /* (pKey1/nKey1) is a number or a null */
  }else if( !(serial_type & 0x01) ){ 
    res = pPKey2->r2;      /* (pKey1/nKey1) is a blob */
  }else{
    int nCmp;
    int nStr;
................................................................................
  */
  assert( sqlite3BtreeCursorIsValid(pCur) );
  nCellKey = sqlite3BtreePayloadSize(pCur);
  assert( (nCellKey & SQLITE_MAX_U32)==(u64)nCellKey );

  /* Read in the complete content of the index entry */
  sqlite3VdbeMemInit(&m, db, 0);
  rc = sqlite3VdbeMemFromBtreeZeroOffset(pCur, (u32)nCellKey, &m);
  if( rc ){
    return rc;
  }

  /* The index entry must begin with a header size */
  getVarint32NR((u8*)m.z, szHdr);
  testcase( szHdr==3 );
  testcase( szHdr==m.n );
  testcase( szHdr>0x7fffffff );
  assert( m.n>=0 );
  if( unlikely(szHdr<3 || szHdr>(unsigned)m.n) ){
    goto idx_rowid_corruption;
  }

  /* The last field of the index should be an integer - the ROWID.
  ** Verify that the last entry really is an integer. */
  getVarint32NR((u8*)&m.z[szHdr-1], typeRowid);
  testcase( typeRowid==1 );
  testcase( typeRowid==2 );
  testcase( typeRowid==3 );
  testcase( typeRowid==4 );
  testcase( typeRowid==5 );
  testcase( typeRowid==6 );
  testcase( typeRowid==8 );
................................................................................
  /* nCellKey will always be between 0 and 0xffffffff because of the way
  ** that btreeParseCellPtr() and sqlite3GetVarint32() are implemented */
  if( nCellKey<=0 || nCellKey>0x7fffffff ){
    *res = 0;
    return SQLITE_CORRUPT_BKPT;
  }
  sqlite3VdbeMemInit(&m, db, 0);
  rc = sqlite3VdbeMemFromBtreeZeroOffset(pCur, (u32)nCellKey, &m);
  if( rc ){
    return rc;
  }
  *res = sqlite3VdbeRecordCompareWithSkip(m.n, m.z, pUnpacked, 0);
  sqlite3VdbeMemRelease(&m);
  return SQLITE_OK;
}
................................................................................
  }
  if( p->pc<0 ){
    /* If there are no other statements currently running, then
    ** reset the interrupt flag.  This prevents a call to sqlite3_interrupt
    ** from interrupting a statement that has not yet started.
    */
    if( db->nVdbeActive==0 ){
      AtomicStore(&db->u1.isInterrupted, 0);
    }

    assert( db->nVdbeWrite>0 || db->autoCommit==0 
        || (db->nDeferredCons==0 && db->nDeferredImmCons==0)
    );

#ifndef SQLITE_OMIT_TRACE
................................................................................
  sqlite3VdbeMemRelease(pVar);
  pVar->flags = MEM_Null;
  p->db->errCode = SQLITE_OK;

  /* If the bit corresponding to this variable in Vdbe.expmask is set, then 
  ** binding a new value to this variable invalidates the current query plan.
  **
  ** IMPLEMENTATION-OF: R-57496-20354 If the specific value bound to a host
  ** parameter in the WHERE clause might influence the choice of query plan
  ** for a statement, then the statement will be automatically recompiled,
  ** as if there had been a schema change, on the first sqlite3_step() call
  ** following any change to the bindings of that parameter.
  */
  assert( (p->prepFlags & SQLITE_PREPARE_SAVESQL)!=0 || p->expmask==0 );
  if( p->expmask!=0 && (p->expmask & (i>=31 ? 0x80000000 : (u32)1<<i))!=0 ){
................................................................................
    }
    sqlite3_str_appendf(pStr,"]");
    if( f & MEM_Zero ){
      sqlite3_str_appendf(pStr, "+%dz",pMem->u.nZero);
    }
  }else if( f & MEM_Str ){
    int j;
    u8 c;
    if( f & MEM_Dyn ){
      c = 'z';
      assert( (f & (MEM_Static|MEM_Ephem))==0 );
    }else if( f & MEM_Static ){
      c = 't';
      assert( (f & (MEM_Dyn|MEM_Ephem))==0 );
    }else if( f & MEM_Ephem ){
................................................................................
      c = 'e';
      assert( (f & (MEM_Static|MEM_Dyn))==0 );
    }else{
      c = 's';
    }
    sqlite3_str_appendf(pStr, " %c%d[", c, pMem->n);
    for(j=0; j<25 && j<pMem->n; j++){
      c = pMem->z[j];
      sqlite3_str_appendchar(pStr, 1, (c>=0x20&&c<=0x7f) ? c : '.');
    }
    sqlite3_str_appendf(pStr, "]%s", encnames[pMem->enc]);
  }
}
#endif

................................................................................
  }
  assert( p->rc==SQLITE_OK || (p->rc&0xff)==SQLITE_BUSY );
  assert( p->bIsReader || p->readOnly!=0 );
  p->iCurrentTime = 0;
  assert( p->explain==0 );
  p->pResultSet = 0;
  db->busyHandler.nBusy = 0;
  if( AtomicLoad(&db->u1.isInterrupted) ) goto abort_due_to_interrupt;
  sqlite3VdbeIOTraceSql(p);
#ifdef SQLITE_DEBUG
  sqlite3BeginBenignMalloc();
  if( p->pc==0
   && (p->db->flags & (SQLITE_VdbeListing|SQLITE_VdbeEQP|SQLITE_VdbeTrace))!=0
  ){
    int i;
................................................................................
  **
  ** This code uses unstructured "goto" statements and does not look clean.
  ** But that is not due to sloppy coding habits. The code is written this
  ** way for performance, to avoid having to run the interrupt and progress
  ** checks on every opcode.  This helps sqlite3_step() to run about 1.5%
  ** faster according to "valgrind --tool=cachegrind" */
check_for_interrupt:
  if( AtomicLoad(&db->u1.isInterrupted) ) goto abort_due_to_interrupt;
#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
  /* Call the progress callback if it is configured and the required number
  ** of VDBE ops have been executed (either since this invocation of
  ** sqlite3VdbeExec() or since last time the progress callback was called).
  ** If the progress callback returns non-zero, exit the virtual machine with
  ** a return code SQLITE_ABORT.
  */
................................................................................
  i64 nByte;          /* Total size of the output string or blob */
  u16 flags1;         /* Initial flags for P1 */
  u16 flags2;         /* Initial flags for P2 */

  pIn1 = &aMem[pOp->p1];
  pIn2 = &aMem[pOp->p2];
  pOut = &aMem[pOp->p3];

  testcase( pOut==pIn2 );
  assert( pIn1!=pOut );
  flags1 = pIn1->flags;
  testcase( flags1 & MEM_Null );
  testcase( pIn2->flags & MEM_Null );
  if( (flags1 | pIn2->flags) & MEM_Null ){
    sqlite3VdbeMemSetNull(pOut);
................................................................................
  }else{
    /* Neither operand is NULL.  Do a comparison. */
    affinity = pOp->p5 & SQLITE_AFF_MASK;
    if( affinity>=SQLITE_AFF_NUMERIC ){
      if( (flags1 | flags3)&MEM_Str ){
        if( (flags1 & (MEM_Int|MEM_IntReal|MEM_Real|MEM_Str))==MEM_Str ){
          applyNumericAffinity(pIn1,0);
          assert( flags3==pIn3->flags );
          flags3 = pIn3->flags;
        }
        if( (flags3 & (MEM_Int|MEM_IntReal|MEM_Real|MEM_Str))==MEM_Str ){
          applyNumericAffinity(pIn3,0);
        }
      }
      /* Handle the common case of integer comparison here, as an
................................................................................
      if( (flags1 & MEM_Str)==0 && (flags1&(MEM_Int|MEM_Real|MEM_IntReal))!=0 ){
        testcase( pIn1->flags & MEM_Int );
        testcase( pIn1->flags & MEM_Real );
        testcase( pIn1->flags & MEM_IntReal );
        sqlite3VdbeMemStringify(pIn1, encoding, 1);
        testcase( (flags1&MEM_Dyn) != (pIn1->flags&MEM_Dyn) );
        flags1 = (pIn1->flags & ~MEM_TypeMask) | (flags1 & MEM_TypeMask);
        if( NEVER(pIn1==pIn3) ) flags3 = flags1 | MEM_Str;
      }
      if( (flags3 & MEM_Str)==0 && (flags3&(MEM_Int|MEM_Real|MEM_IntReal))!=0 ){
        testcase( pIn3->flags & MEM_Int );
        testcase( pIn3->flags & MEM_Real );
        testcase( pIn3->flags & MEM_IntReal );
        sqlite3VdbeMemStringify(pIn3, encoding, 1);
        testcase( (flags3&MEM_Dyn) != (pIn3->flags&MEM_Dyn) );
................................................................................
    /* If there is more header available for parsing in the record, try
    ** to extract additional fields up through the p2+1-th field 
    */
    if( pC->iHdrOffset<aOffset[0] ){
      /* Make sure zData points to enough of the record to cover the header. */
      if( pC->aRow==0 ){
        memset(&sMem, 0, sizeof(sMem));
        rc = sqlite3VdbeMemFromBtreeZeroOffset(pC->uc.pCursor,aOffset[0],&sMem);
        if( rc!=SQLITE_OK ) goto abort_due_to_error;
        zData = (u8*)sMem.z;
      }else{
        zData = pC->aRow;
      }
  
      /* Fill in pC->aType[i] and aOffset[i] values through the p2-th field. */
................................................................................
  assert( nByte==(int)(zPayload - (u8*)pOut->z) );

  assert( pOp->p3>0 && pOp->p3<=(p->nMem+1 - p->nCursor) );
  REGISTER_TRACE(pOp->p3, pOut);
  break;
}

/* Opcode: Count P1 P2 p3 * *
** Synopsis: r[P2]=count()
**
** Store the number of entries (an integer value) in the table or index 
** opened by cursor P1 in register P2.
**
** If P3==0, then an exact count is obtained, which involves visiting
** every btree page of the table.  But if P3 is non-zero, an estimate
** is returned based on the current cursor position.  
*/

case OP_Count: {         /* out2 */
  i64 nEntry;
  BtCursor *pCrsr;

  assert( p->apCsr[pOp->p1]->eCurType==CURTYPE_BTREE );
  pCrsr = p->apCsr[pOp->p1]->uc.pCursor;
  assert( pCrsr );
  if( pOp->p3 ){
    nEntry = sqlite3BtreeRowCountEst(pCrsr);
  }else{
    nEntry = 0;  /* Not needed.  Only used to silence a warning. */
    rc = sqlite3BtreeCount(db, pCrsr, &nEntry);
    if( rc ) goto abort_due_to_error;
  }
  pOut = out2Prerelease(p, pOp);
  pOut->u.i = nEntry;
  goto check_for_interrupt;
}


/* Opcode: Savepoint P1 * * P4 *
**
** Open, release or rollback the savepoint named by parameter P4, depending
** on the value of P1. To open a new savepoint set P1==0 (SAVEPOINT_BEGIN).
** To release (commit) an existing savepoint set P1==1 (SAVEPOINT_RELEASE).
** To rollback an existing savepoint set P1==2 (SAVEPOINT_ROLLBACK).
................................................................................
** values need not be contiguous but all P1 values should be small integers.
** It is an error for P1 to be negative.
**
** Allowed P5 bits:
** <ul>
** <li>  <b>0x02 OPFLAG_SEEKEQ</b>: This cursor will only be used for
**       equality lookups (implemented as a pair of opcodes OP_SeekGE/OP_IdxGT
**       of OP_SeekLE/OP_IdxLT)
** </ul>
**
** The P4 value may be either an integer (P4_INT32) or a pointer to
** a KeyInfo structure (P4_KEYINFO). If it is a pointer to a KeyInfo 
** object, then table being opened must be an [index b-tree] where the
** KeyInfo object defines the content and collating 
** sequence of that index b-tree. Otherwise, if P4 is an integer 
................................................................................
** be the same as every other ReopenIdx or OpenRead for the same cursor
** number.
**
** Allowed P5 bits:
** <ul>
** <li>  <b>0x02 OPFLAG_SEEKEQ</b>: This cursor will only be used for
**       equality lookups (implemented as a pair of opcodes OP_SeekGE/OP_IdxGT
**       of OP_SeekLE/OP_IdxLT)
** </ul>
**
** See also: OP_OpenRead, OP_OpenWrite
*/
/* Opcode: OpenWrite P1 P2 P3 P4 P5
** Synopsis: root=P2 iDb=P3
**
................................................................................
** value, then the table being opened must be a [table b-tree] with a
** number of columns no less than the value of P4.
**
** Allowed P5 bits:
** <ul>
** <li>  <b>0x02 OPFLAG_SEEKEQ</b>: This cursor will only be used for
**       equality lookups (implemented as a pair of opcodes OP_SeekGE/OP_IdxGT
**       of OP_SeekLE/OP_IdxLT)
** <li>  <b>0x08 OPFLAG_FORDELETE</b>: This cursor is used only to seek
**       and subsequently delete entries in an index btree.  This is a
**       hint to the storage engine that the storage engine is allowed to
**       ignore.  The hint is not used by the official SQLite b*tree storage
**       engine, but is used by COMDB2.
** <li>  <b>0x10 OPFLAG_P2ISREG</b>: Use the content of register P2
**       as the root page, not the value of P2 itself.
................................................................................
  ** since moved into the btree layer.  */  
  pCur->isTable = pOp->p4type!=P4_KEYINFO;

open_cursor_set_hints:
  assert( OPFLAG_BULKCSR==BTREE_BULKLOAD );
  assert( OPFLAG_SEEKEQ==BTREE_SEEK_EQ );
  testcase( pOp->p5 & OPFLAG_BULKCSR );

  testcase( pOp->p2 & OPFLAG_SEEKEQ );

  sqlite3BtreeCursorHintFlags(pCur->uc.pCursor,
                               (pOp->p5 & (OPFLAG_BULKCSR|OPFLAG_SEEKEQ)));
  if( rc ) goto abort_due_to_error;
  break;
}

/* Opcode: OpenDup P1 P2 * * *
................................................................................
** that are used as an unpacked index key. 
**
** Reposition cursor P1 so that  it points to the smallest entry that 
** is greater than or equal to the key value. If there are no records 
** greater than or equal to the key and P2 is not zero, then jump to P2.
**
** If the cursor P1 was opened using the OPFLAG_SEEKEQ flag, then this
** opcode will either land on a record that exactly matches the key, or
** else it will cause a jump to P2.  When the cursor is OPFLAG_SEEKEQ,
** this opcode must be followed by an IdxLE opcode with the same arguments.
** The IdxGT opcode will be skipped if this opcode succeeds, but the
** IdxGT opcode will be used on subsequent loop iterations.  The 
** OPFLAG_SEEKEQ flags is a hint to the btree layer to say that this
** is an equality search.
**
** This opcode leaves the cursor configured to move in forward order,
** from the beginning toward the end.  In other words, the cursor is
** configured to use Next, not Prev.
**
** See also: Found, NotFound, SeekLt, SeekGt, SeekLe
*/
................................................................................
** Synopsis: key=r[P3@P4]
**
** If cursor P1 refers to an SQL table (B-Tree that uses integer keys), 
** use the value in register P3 as a key. If cursor P1 refers 
** to an SQL index, then P3 is the first in an array of P4 registers 
** that are used as an unpacked index key. 
**
** Reposition cursor P1 so that it points to the smallest entry that 
** is greater than the key value. If there are no records greater than 
** the key and P2 is not zero, then jump to P2.
**
** This opcode leaves the cursor configured to move in forward order,
** from the beginning toward the end.  In other words, the cursor is
** configured to use Next, not Prev.
**
................................................................................
** less than or equal to the key and P2 is not zero, then jump to P2.
**
** This opcode leaves the cursor configured to move in reverse order,
** from the end toward the beginning.  In other words, the cursor is
** configured to use Prev, not Next.
**
** If the cursor P1 was opened using the OPFLAG_SEEKEQ flag, then this
** opcode will either land on a record that exactly matches the key, or
** else it will cause a jump to P2.  When the cursor is OPFLAG_SEEKEQ,
** this opcode must be followed by an IdxLE opcode with the same arguments.
** The IdxGE opcode will be skipped if this opcode succeeds, but the
** IdxGE opcode will be used on subsequent loop iterations.  The 
** OPFLAG_SEEKEQ flags is a hint to the btree layer to say that this
** is an equality search.
**
** See also: Found, NotFound, SeekGt, SeekGe, SeekLt
*/
case OP_SeekLT:         /* jump, in3, group */
case OP_SeekLE:         /* jump, in3, group */
case OP_SeekGE:         /* jump, in3, group */
case OP_SeekGT: {       /* jump, in3, group */
................................................................................
  pC->seekOp = pOp->opcode;
#endif

  pC->deferredMoveto = 0;
  pC->cacheStatus = CACHE_STALE;
  if( pC->isTable ){
    u16 flags3, newType;
    /* The OPFLAG_SEEKEQ/BTREE_SEEK_EQ flag is only set on index cursors */
    assert( sqlite3BtreeCursorHasHint(pC->uc.pCursor, BTREE_SEEK_EQ)==0
              || CORRUPT_DB );

    /* The input value in P3 might be of any type: integer, real, string,
    ** blob, or NULL.  But it needs to be an integer before we can do
    ** the seek, so convert it. */
    pIn3 = &aMem[pOp->p3];
................................................................................
    }
    rc = sqlite3BtreeMovetoUnpacked(pC->uc.pCursor, 0, (u64)iKey, 0, &res);
    pC->movetoTarget = iKey;  /* Used by OP_Delete */
    if( rc!=SQLITE_OK ){
      goto abort_due_to_error;
    }
  }else{
    /* For a cursor with the OPFLAG_SEEKEQ/BTREE_SEEK_EQ hint, only the
    ** OP_SeekGE and OP_SeekLE opcodes are allowed, and these must be
    ** immediately followed by an OP_IdxGT or OP_IdxLT opcode, respectively,
    ** with the same key.
    */
    if( sqlite3BtreeCursorHasHint(pC->uc.pCursor, BTREE_SEEK_EQ) ){
      eqOnly = 1;
      assert( pOp->opcode==OP_SeekGE || pOp->opcode==OP_SeekLE );
      assert( pOp[1].opcode==OP_IdxLT || pOp[1].opcode==OP_IdxGT );
      assert( pOp->opcode==OP_SeekGE || pOp[1].opcode==OP_IdxLT );
      assert( pOp->opcode==OP_SeekLE || pOp[1].opcode==OP_IdxGT );
      assert( pOp[1].p1==pOp[0].p1 );
      assert( pOp[1].p2==pOp[0].p2 );
      assert( pOp[1].p3==pOp[0].p3 );
      assert( pOp[1].p4.i==pOp[0].p4.i );
    }

    nField = pOp->p4.i;
................................................................................
#endif

  n = sqlite3BtreePayloadSize(pCrsr);
  if( n>(u32)db->aLimit[SQLITE_LIMIT_LENGTH] ){
    goto too_big;
  }
  testcase( n==0 );
  rc = sqlite3VdbeMemFromBtreeZeroOffset(pCrsr, n, pOut);
  if( rc ) goto abort_due_to_error;
  if( !pOp->p3 ) Deephemeralize(pOut);
  UPDATE_MAX_BLOBSIZE(pOut);
  REGISTER_TRACE(pOp->p2, pOut);
  break;
}

................................................................................
** the OPFLAG_USESEEKRESULT flag must only be set if there have been no prior
** seeks on the cursor or if the most recent seek used a key equivalent
** to P2. 
**
** This instruction only works for indices.  The equivalent instruction
** for tables is OP_Insert.
*/








case OP_IdxInsert: {        /* in2 */
  VdbeCursor *pC;
  BtreePayload x;

  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  pC = p->apCsr[pOp->p1];
  sqlite3VdbeIncrWriteCounter(p, pC);
  assert( pC!=0 );
  assert( !isSorter(pC) );
  pIn2 = &aMem[pOp->p2];
  assert( pIn2->flags & MEM_Blob );
  if( pOp->p5 & OPFLAG_NCHANGE ) p->nChange++;
  assert( pC->eCurType==CURTYPE_BTREE );
  assert( pC->isTable==0 );
  rc = ExpandBlob(pIn2);
  if( rc ) goto abort_due_to_error;



  x.nKey = pIn2->n;
  x.pKey = pIn2->z;
  x.aMem = aMem + pOp->p3;
  x.nMem = (u16)pOp->p4.i;
  rc = sqlite3BtreeInsert(pC->uc.pCursor, &x,
       (pOp->p5 & (OPFLAG_APPEND|OPFLAG_SAVEPOSITION)), 
      ((pOp->p5 & OPFLAG_USESEEKRESULT) ? pC->seekResult : 0)
      );
  assert( pC->deferredMoveto==0 );
  pC->cacheStatus = CACHE_STALE;
  if( rc) goto abort_due_to_error;
  break;
}

/* Opcode: SorterInsert P1 P2 * * *
** Synopsis: key=r[P2]
**
** Register P2 holds an SQL index key made using the
** MakeRecord instructions.  This opcode writes that key
** into the sorter P1.  Data for the entry is nil.
*/
case OP_SorterInsert: {     /* in2 */
  VdbeCursor *pC;

  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  pC = p->apCsr[pOp->p1];
  sqlite3VdbeIncrWriteCounter(p, pC);
  assert( pC!=0 );
  assert( isSorter(pC) );
  pIn2 = &aMem[pOp->p2];
  assert( pIn2->flags & MEM_Blob );
  assert( pC->isTable==0 );
  rc = ExpandBlob(pIn2);
  if( rc ) goto abort_due_to_error;
  rc = sqlite3VdbeSorterWrite(pC, pIn2);
  if( rc) goto abort_due_to_error;
  break;
}

/* Opcode: IdxDelete P1 P2 P3 * P5
** Synopsis: key=r[P2@P3]
**
** The content of P3 registers starting at register P2 form
** an unpacked index key. This opcode removes that entry from the 
** index opened by cursor P1.
**
** If P5 is not zero, then raise an SQLITE_CORRUPT_INDEX error
** if no matching index entry is found.  This happens when running
** an UPDATE or DELETE statement and the index entry to be updated
** or deleted is not found.  For some uses of IdxDelete
** (example:  the EXCEPT operator) it does not matter that no matching
** entry is found.  For those cases, P5 is zero.
*/
case OP_IdxDelete: {
  VdbeCursor *pC;
  BtCursor *pCrsr;
  int res;
  UnpackedRecord r;

................................................................................
  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  pC = p->apCsr[pOp->p1];
  assert( pC!=0 );
  assert( pC->eCurType==CURTYPE_BTREE );
  sqlite3VdbeIncrWriteCounter(p, pC);
  pCrsr = pC->uc.pCursor;
  assert( pCrsr!=0 );

  r.pKeyInfo = pC->pKeyInfo;
  r.nField = (u16)pOp->p3;
  r.default_rc = 0;
  r.aMem = &aMem[pOp->p2];
  rc = sqlite3BtreeMovetoUnpacked(pCrsr, &r, 0, 0, &res);
  if( rc ) goto abort_due_to_error;
  if( res==0 ){
    rc = sqlite3BtreeDelete(pCrsr, BTREE_AUXDELETE);
    if( rc ) goto abort_due_to_error;
  }else if( pOp->p5 ){
    rc = SQLITE_CORRUPT_INDEX;
    goto abort_due_to_error;
  }
  assert( pC->deferredMoveto==0 );
  pC->cacheStatus = CACHE_STALE;
  pC->seekResult = 0;
  break;
}

................................................................................
#ifdef SQLITE_DEBUG
  /* Verify that second and subsequent executions of the same trigger do not
  ** try to reuse register values from the first use. */
  {
    int i;
    for(i=0; i<p->nMem; i++){
      aMem[i].pScopyFrom = 0;  /* Prevent false-positive AboutToChange() errs */
      MemSetTypeFlag(&aMem[i], MEM_Undefined); /* Fault if this reg is reused */
    }
  }
#endif
  pOp = &aOp[-1];
  goto check_for_interrupt;
}

................................................................................
  }
  pOut->u.i = sqlite3BtreeMaxPageCount(pBt, newMax);
  break;
}
#endif

/* Opcode: Function P1 P2 P3 P4 *
** Synopsis: r[P3]=func(r[P2@NP])
**
** Invoke a user function (P4 is a pointer to an sqlite3_context object that
** contains a pointer to the function to be run) with arguments taken
** from register P2 and successors.  The number of arguments is in
** the sqlite3_context object that P4 points to.
** The result of the function is stored
** in register P3.  Register P3 must not be one of the function inputs.
................................................................................
** whether meta data associated with a user function argument using the
** sqlite3_set_auxdata() API may be safely retained until the next
** invocation of this opcode.
**
** See also: AggStep, AggFinal, PureFunc
*/
/* Opcode: PureFunc P1 P2 P3 P4 *
** Synopsis: r[P3]=func(r[P2@NP])
**
** Invoke a user function (P4 is a pointer to an sqlite3_context object that
** contains a pointer to the function to be run) with arguments taken
** from register P2 and successors.  The number of arguments is in
** the sqlite3_context object that P4 points to.
** The result of the function is stored
** in register P3.  Register P3 must not be one of the function inputs.
................................................................................
  rc = SQLITE_NOMEM_BKPT;
  goto abort_due_to_error;

  /* Jump to here if the sqlite3_interrupt() API sets the interrupt
  ** flag.
  */
abort_due_to_interrupt:
  assert( AtomicLoad(&db->u1.isInterrupted) );
  rc = db->mallocFailed ? SQLITE_NOMEM_BKPT : SQLITE_INTERRUPT;
  p->rc = rc;
  sqlite3VdbeError(p, "%s", sqlite3ErrStr(rc));
  goto abort_due_to_error;
}


................................................................................
  const u8 * const v1 = &p1[ p1[0] ];   /* Pointer to value 1 */
  const u8 * const v2 = &p2[ p2[0] ];   /* Pointer to value 2 */

  int n1;
  int n2;
  int res;

  getVarint32NR(&p1[1], n1);
  getVarint32NR(&p2[1], n2);
  res = memcmp(v1, v2, (MIN(n1, n2) - 13)/2);
  if( res==0 ){
    res = n1 - n2;
  }

  if( res==0 ){
    if( pTask->pSorter->pKeyInfo->nKeyField>1 ){
................................................................................
  int bFlush;                     /* True to flush contents of memory to PMA */
  int nReq;                       /* Bytes of memory required */
  int nPMA;                       /* Bytes of PMA space required */
  int t;                          /* serial type of first record field */

  assert( pCsr->eCurType==CURTYPE_SORTER );
  pSorter = pCsr->uc.pSorter;
  getVarint32NR((const u8*)&pVal->z[1], t);
  if( t>0 && t<10 && t!=7 ){
    pSorter->typeMask &= SORTER_TYPE_INTEGER;
  }else if( t>10 && (t & 0x01) ){
    pSorter->typeMask &= SORTER_TYPE_TEXT;
  }else{
    pSorter->typeMask = 0;
  }
................................................................................
  }

  *pRes = sqlite3VdbeRecordCompare(pVal->n, pVal->z, r2);
  return SQLITE_OK;
}

/************** End of vdbesort.c ********************************************/
/************** Begin file vdbevtab.c ****************************************/
/*
** 2020-03-23
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
**
** This file implements virtual-tables for examining the bytecode content
** of a prepared statement.
*/
/* #include "sqliteInt.h" */
#if defined(SQLITE_ENABLE_BYTECODE_VTAB) && !defined(SQLITE_OMIT_VIRTUALTABLE)
/* #include "vdbeInt.h" */

/* An instance of the bytecode() table-valued function.
*/
typedef struct bytecodevtab bytecodevtab;
struct bytecodevtab {
  sqlite3_vtab base;     /* Base class - must be first */
  sqlite3 *db;           /* Database connection */
  int bTablesUsed;       /* 2 for tables_used().  0 for bytecode(). */
};

/* A cursor for scanning through the bytecode
*/
typedef struct bytecodevtab_cursor bytecodevtab_cursor;
struct bytecodevtab_cursor {
  sqlite3_vtab_cursor base;  /* Base class - must be first */
  sqlite3_stmt *pStmt;       /* The statement whose bytecode is displayed */
  int iRowid;                /* The rowid of the output table */
  int iAddr;                 /* Address */
  int needFinalize;          /* Cursors owns pStmt and must finalize it */
  int showSubprograms;       /* Provide a listing of subprograms */
  Op *aOp;                   /* Operand array */
  char *zP4;                 /* Rendered P4 value */
  const char *zType;         /* tables_used.type */
  const char *zSchema;       /* tables_used.schema */
  const char *zName;         /* tables_used.name */
  Mem sub;                   /* Subprograms */
};

/*
** Create a new bytecode() table-valued function.
*/
static int bytecodevtabConnect(
  sqlite3 *db,
  void *pAux,
  int argc, const char *const*argv,
  sqlite3_vtab **ppVtab,
  char **pzErr
){
  bytecodevtab *pNew;
  int rc;
  int isTabUsed = pAux!=0;
  const char *azSchema[2] = {
    /* bytecode() schema */
    "CREATE TABLE x("
      "addr INT,"
      "opcode TEXT,"
      "p1 INT,"
      "p2 INT,"
      "p3 INT,"
      "p4 TEXT,"
      "p5 INT,"
      "comment TEXT,"
      "subprog TEXT," 
      "stmt HIDDEN"
    ");",

    /* Tables_used() schema */
    "CREATE TABLE x("
      "type TEXT,"
      "schema TEXT,"
      "name TEXT,"
      "wr INT,"
      "subprog TEXT," 
      "stmt HIDDEN"
   ");"
  };

  rc = sqlite3_declare_vtab(db, azSchema[isTabUsed]);
  if( rc==SQLITE_OK ){
    pNew = sqlite3_malloc( sizeof(*pNew) );
    *ppVtab = (sqlite3_vtab*)pNew;
    if( pNew==0 ) return SQLITE_NOMEM;
    memset(pNew, 0, sizeof(*pNew));
    pNew->db = db;
    pNew->bTablesUsed = isTabUsed*2;
  }
  return rc;
}

/*
** This method is the destructor for bytecodevtab objects.
*/
static int bytecodevtabDisconnect(sqlite3_vtab *pVtab){
  bytecodevtab *p = (bytecodevtab*)pVtab;
  sqlite3_free(p);
  return SQLITE_OK;
}

/*
** Constructor for a new bytecodevtab_cursor object.
*/
static int bytecodevtabOpen(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCursor){
  bytecodevtab *pVTab = (bytecodevtab*)p;
  bytecodevtab_cursor *pCur;
  pCur = sqlite3_malloc( sizeof(*pCur) );
  if( pCur==0 ) return SQLITE_NOMEM;
  memset(pCur, 0, sizeof(*pCur));
  sqlite3VdbeMemInit(&pCur->sub, pVTab->db, 1);
  *ppCursor = &pCur->base;
  return SQLITE_OK;
}

/*
** Clear all internal content from a bytecodevtab cursor.
*/
static void bytecodevtabCursorClear(bytecodevtab_cursor *pCur){
  sqlite3_free(pCur->zP4);
  pCur->zP4 = 0;
  sqlite3VdbeMemRelease(&pCur->sub);
  sqlite3VdbeMemSetNull(&pCur->sub);
  if( pCur->needFinalize ){
    sqlite3_finalize(pCur->pStmt);
  }
  pCur->pStmt = 0;
  pCur->needFinalize = 0;
  pCur->zType = 0;
  pCur->zSchema = 0;
  pCur->zName = 0;
}

/*
** Destructor for a bytecodevtab_cursor.
*/
static int bytecodevtabClose(sqlite3_vtab_cursor *cur){
  bytecodevtab_cursor *pCur = (bytecodevtab_cursor*)cur;
  bytecodevtabCursorClear(pCur);
  sqlite3_free(pCur);
  return SQLITE_OK;
}


/*
** Advance a bytecodevtab_cursor to its next row of output.
*/
static int bytecodevtabNext(sqlite3_vtab_cursor *cur){
  bytecodevtab_cursor *pCur = (bytecodevtab_cursor*)cur;
  bytecodevtab *pTab = (bytecodevtab*)cur->pVtab;
  int rc;
  if( pCur->zP4 ){
    sqlite3_free(pCur->zP4);
    pCur->zP4 = 0;
  }
  if( pCur->zName ){
    pCur->zName = 0;
    pCur->zType = 0;
    pCur->zSchema = 0;
  }
  rc = sqlite3VdbeNextOpcode(
           (Vdbe*)pCur->pStmt, 
           pCur->showSubprograms ? &pCur->sub : 0,
           pTab->bTablesUsed,
           &pCur->iRowid,
           &pCur->iAddr,
           &pCur->aOp);
  if( rc!=SQLITE_OK ){
    sqlite3VdbeMemSetNull(&pCur->sub);
    pCur->aOp = 0;
  }
  return SQLITE_OK;
}

/*
** Return TRUE if the cursor has been moved off of the last
** row of output.
*/
static int bytecodevtabEof(sqlite3_vtab_cursor *cur){
  bytecodevtab_cursor *pCur = (bytecodevtab_cursor*)cur;
  return pCur->aOp==0;
}

/*
** Return values of columns for the row at which the bytecodevtab_cursor
** is currently pointing.
*/
static int bytecodevtabColumn(
  sqlite3_vtab_cursor *cur,   /* The cursor */
  sqlite3_context *ctx,       /* First argument to sqlite3_result_...() */
  int i                       /* Which column to return */
){
  bytecodevtab_cursor *pCur = (bytecodevtab_cursor*)cur;
  bytecodevtab *pVTab = (bytecodevtab*)cur->pVtab;
  Op *pOp = pCur->aOp + pCur->iAddr;
  if( pVTab->bTablesUsed ){
    if( i==4 ){
      i = 8;
    }else{
      if( i<=2 && pCur->zType==0 ){
        Schema *pSchema;
        HashElem *k;
        int iDb = pOp->p3;
        int iRoot = pOp->p2;
        sqlite3 *db = pVTab->db;
        pSchema = db->aDb[iDb].pSchema;
        pCur->zSchema = db->aDb[iDb].zDbSName;
        for(k=sqliteHashFirst(&pSchema->tblHash); k; k=sqliteHashNext(k)){
          Table *pTab = (Table*)sqliteHashData(k);
          if( !IsVirtual(pTab) && pTab->tnum==iRoot ){
            pCur->zName = pTab->zName;
            pCur->zType = "table";
            break;
          }
        }
        if( pCur->zName==0 ){
          for(k=sqliteHashFirst(&pSchema->idxHash); k; k=sqliteHashNext(k)){
            Index *pIdx = (Index*)sqliteHashData(k);
            if( pIdx->tnum==iRoot ){
              pCur->zName = pIdx->zName;
              pCur->zType = "index";
            }
          }
        }
      }
      i += 10;
    }
  }
  switch( i ){
    case 0:   /* addr */
      sqlite3_result_int(ctx, pCur->iAddr);
      break;
    case 1:   /* opcode */
      sqlite3_result_text(ctx, (char*)sqlite3OpcodeName(pOp->opcode),
                          -1, SQLITE_STATIC);
      break;
    case 2:   /* p1 */
      sqlite3_result_int(ctx, pOp->p1);
      break;
    case 3:   /* p2 */
      sqlite3_result_int(ctx, pOp->p2);
      break;
    case 4:   /* p3 */
      sqlite3_result_int(ctx, pOp->p3);
      break;
    case 5:   /* p4 */
    case 7:   /* comment */
      if( pCur->zP4==0 ){
        pCur->zP4 = sqlite3VdbeDisplayP4(pVTab->db, pOp);
      }
      if( i==5 ){
        sqlite3_result_text(ctx, pCur->zP4, -1, SQLITE_STATIC);
      }else{
#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
        char *zCom = sqlite3VdbeDisplayComment(pVTab->db, pOp, pCur->zP4);
        sqlite3_result_text(ctx, zCom, -1, sqlite3_free);
#endif
      }
      break;
    case 6:     /* p5 */
      sqlite3_result_int(ctx, pOp->p5);
      break;
    case 8: {   /* subprog */
      Op *aOp = pCur->aOp;
      assert( aOp[0].opcode==OP_Init );
      assert( aOp[0].p4.z==0 || strncmp(aOp[0].p4.z,"-" "- ",3)==0 );
      if( pCur->iRowid==pCur->iAddr+1 ){
        break;  /* Result is NULL for the main program */
      }else if( aOp[0].p4.z!=0 ){
         sqlite3_result_text(ctx, aOp[0].p4.z+3, -1, SQLITE_STATIC);
      }else{
         sqlite3_result_text(ctx, "(FK)", 4, SQLITE_STATIC);
      }
      break;
    }
    case 10:  /* tables_used.type */
      sqlite3_result_text(ctx, pCur->zType, -1, SQLITE_STATIC);
      break;
    case 11:  /* tables_used.schema */
      sqlite3_result_text(ctx, pCur->zSchema, -1, SQLITE_STATIC);
      break;
    case 12:  /* tables_used.name */
      sqlite3_result_text(ctx, pCur->zName, -1, SQLITE_STATIC);
      break;
    case 13:  /* tables_used.wr */
      sqlite3_result_int(ctx, pOp->opcode==OP_OpenWrite);
      break;
  }
  return SQLITE_OK;
}

/*
** Return the rowid for the current row.  In this implementation, the
** rowid is the same as the output value.
*/
static int bytecodevtabRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
  bytecodevtab_cursor *pCur = (bytecodevtab_cursor*)cur;
  *pRowid = pCur->iRowid;
  return SQLITE_OK;
}

/*
** Initialize a cursor.
**
**    idxNum==0     means show all subprograms
**    idxNum==1     means show only the main bytecode and omit subprograms.
*/
static int bytecodevtabFilter(
  sqlite3_vtab_cursor *pVtabCursor, 
  int idxNum, const char *idxStr,
  int argc, sqlite3_value **argv
){
  bytecodevtab_cursor *pCur = (bytecodevtab_cursor *)pVtabCursor;
  bytecodevtab *pVTab = (bytecodevtab *)pVtabCursor->pVtab;
  int rc = SQLITE_OK;

  bytecodevtabCursorClear(pCur);
  pCur->iRowid = 0;
  pCur->iAddr = 0;
  pCur->showSubprograms = idxNum==0;
  assert( argc==1 );
  if( sqlite3_value_type(argv[0])==SQLITE_TEXT ){
    const char *zSql = (const char*)sqlite3_value_text(argv[0]);
    if( zSql==0 ){
      rc = SQLITE_NOMEM;
    }else{
      rc = sqlite3_prepare_v2(pVTab->db, zSql, -1, &pCur->pStmt, 0);
      pCur->needFinalize = 1;
    }
  }else{
    pCur->pStmt = (sqlite3_stmt*)sqlite3_value_pointer(argv[0],"stmt-pointer");
  }
  if( pCur->pStmt==0 ){
    pVTab->base.zErrMsg = sqlite3_mprintf(
       "argument to %s() is not a valid SQL statement",
       pVTab->bTablesUsed ? "tables_used" : "bytecode"
    );
    rc = SQLITE_ERROR;
  }else{
    bytecodevtabNext(pVtabCursor);
  }
  return rc;
}

/*
** We must have a single stmt=? constraint that will be passed through
** into the xFilter method.  If there is no valid stmt=? constraint,
** then return an SQLITE_CONSTRAINT error.
*/
static int bytecodevtabBestIndex(
  sqlite3_vtab *tab,
  sqlite3_index_info *pIdxInfo
){
  int i;
  int rc = SQLITE_CONSTRAINT;
  struct sqlite3_index_constraint *p;
  bytecodevtab *pVTab = (bytecodevtab*)tab;
  int iBaseCol = pVTab->bTablesUsed ? 4 : 8;
  pIdxInfo->estimatedCost = (double)100;
  pIdxInfo->estimatedRows = 100;
  pIdxInfo->idxNum = 0;
  for(i=0, p=pIdxInfo->aConstraint; i<pIdxInfo->nConstraint; i++, p++){
    if( p->usable==0 ) continue;
    if( p->op==SQLITE_INDEX_CONSTRAINT_EQ && p->iColumn==iBaseCol+1 ){
      rc = SQLITE_OK;
      pIdxInfo->aConstraintUsage[i].omit = 1;
      pIdxInfo->aConstraintUsage[i].argvIndex = 1;
    }
    if( p->op==SQLITE_INDEX_CONSTRAINT_ISNULL && p->iColumn==iBaseCol ){
      pIdxInfo->aConstraintUsage[i].omit = 1;
      pIdxInfo->idxNum = 1;
    }
  }
  return rc;
}

/*
** This following structure defines all the methods for the 
** virtual table.
*/
static sqlite3_module bytecodevtabModule = {
  /* iVersion    */ 0,
  /* xCreate     */ 0,
  /* xConnect    */ bytecodevtabConnect,
  /* xBestIndex  */ bytecodevtabBestIndex,
  /* xDisconnect */ bytecodevtabDisconnect,
  /* xDestroy    */ 0,
  /* xOpen       */ bytecodevtabOpen,
  /* xClose      */ bytecodevtabClose,
  /* xFilter     */ bytecodevtabFilter,
  /* xNext       */ bytecodevtabNext,
  /* xEof        */ bytecodevtabEof,
  /* xColumn     */ bytecodevtabColumn,
  /* xRowid      */ bytecodevtabRowid,
  /* xUpdate     */ 0,
  /* xBegin      */ 0,
  /* xSync       */ 0,
  /* xCommit     */ 0,
  /* xRollback   */ 0,
  /* xFindMethod */ 0,
  /* xRename     */ 0,
  /* xSavepoint  */ 0,
  /* xRelease    */ 0,
  /* xRollbackTo */ 0,
  /* xShadowName */ 0
};


SQLITE_PRIVATE int sqlite3VdbeBytecodeVtabInit(sqlite3 *db){
  int rc;
  rc = sqlite3_create_module(db, "bytecode", &bytecodevtabModule, 0);
  if( rc==SQLITE_OK ){
    rc = sqlite3_create_module(db, "tables_used", &bytecodevtabModule, &db);
  }
  return rc;
}
#elif defined(SQLITE_ENABLE_BYTECODE_VTAB)
SQLITE_PRIVATE int sqlite3VdbeBytecodeVtabInit(sqlite3 *db){ return SQLITE_OK; }
#endif /* SQLITE_ENABLE_BYTECODE_VTAB */

/************** End of vdbevtab.c ********************************************/
/************** Begin file memjournal.c **************************************/
/*
** 2008 October 7
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
................................................................................
*/
SQLITE_PRIVATE int sqlite3WalkSelectFrom(Walker *pWalker, Select *p){
  SrcList *pSrc;
  int i;
  struct SrcList_item *pItem;

  pSrc = p->pSrc;
  if( pSrc ){
    for(i=pSrc->nSrc, pItem=pSrc->a; i>0; i--, pItem++){
      if( pItem->pSelect && sqlite3WalkSelect(pWalker, pItem->pSelect) ){
        return WRC_Abort;
      }
      if( pItem->fg.isTabFunc
       && sqlite3WalkExprList(pWalker, pItem->u1.pFuncArg)
      ){
        return WRC_Abort;
      }
    }
  }
  return WRC_Continue;
} 

/*
** Call sqlite3WalkExpr() for every expression in Select statement p.
................................................................................
  const struct ExprList_item *pItem,
  const char *zCol,
  const char *zTab,
  const char *zDb
){
  int n;
  const char *zSpan;
  if( pItem->eEName!=ENAME_TAB ) return 0;
  zSpan = pItem->zEName;
  for(n=0; ALWAYS(zSpan[n]) && zSpan[n]!='.'; n++){}
  if( zDb && (sqlite3StrNICmp(zSpan, zDb, n)!=0 || zDb[n]!=0) ){
    return 0;
  }
  zSpan += n+1;
  for(n=0; ALWAYS(zSpan[n]) && zSpan[n]!='.'; n++){}
................................................................................
    }
    return (db->flags & SQLITE_DqsDDL)!=0;
  }else{
    /* Currently parsing a DML statement */
    return (db->flags & SQLITE_DqsDML)!=0;
  }
}

/*
** The argument is guaranteed to be a non-NULL Expr node of type TK_COLUMN.
** return the appropriate colUsed mask.
*/
SQLITE_PRIVATE Bitmask sqlite3ExprColUsed(Expr *pExpr){
  int n;
  Table *pExTab;

  n = pExpr->iColumn;
  pExTab = pExpr->y.pTab;
  assert( pExTab!=0 );
  if( (pExTab->tabFlags & TF_HasGenerated)!=0
   && (pExTab->aCol[n].colFlags & COLFLAG_GENERATED)!=0 
  ){
    testcase( pExTab->nCol==BMS-1 );
    testcase( pExTab->nCol==BMS );
    return pExTab->nCol>=BMS ? ALLBITS : MASKBIT(pExTab->nCol)-1;
  }else{
    testcase( n==BMS-1 );
    testcase( n==BMS );
    if( n>=BMS ) n = BMS-1;
    return ((Bitmask)1)<<n;
  }
}

/*
** Given the name of a column of the form X.Y.Z or Y.Z or just Z, look up
** that name in the set of source tables in pSrcList and make the pExpr 
** expression node refer back to that source column.  The following changes
** are made to pExpr:
**
................................................................................
      for(i=0; i<db->nDb; i++){
        assert( db->aDb[i].zDbSName );
        if( sqlite3StrICmp(db->aDb[i].zDbSName,zDb)==0 ){
          pSchema = db->aDb[i].pSchema;
          break;
        }
      }
      if( i==db->nDb && sqlite3StrICmp("main", zDb)==0 ){
        /* This branch is taken when the main database has been renamed
        ** using SQLITE_DBCONFIG_MAINDBNAME. */
        pSchema = db->aDb[0].pSchema;
        zDb = db->aDb[0].zDbSName;
      }
    }
  }

  /* Start at the inner-most context and move outward until a match is found */
  assert( pNC && cnt==0 );
  do{
    ExprList *pEList;
    SrcList *pSrcList = pNC->pSrcList;

    if( pSrcList ){
      for(i=0, pItem=pSrcList->a; i<pSrcList->nSrc; i++, pItem++){
        u8 hCol;
        pTab = pItem->pTab;
        assert( pTab!=0 && pTab->zName!=0 );
        assert( pTab->nCol>0 );
        if( pItem->pSelect && (pItem->pSelect->selFlags & SF_NestedFrom)!=0 ){
          int hit = 0;
          pEList = pItem->pSelect->pEList;
          for(j=0; j<pEList->nExpr; j++){
................................................................................
          if( IN_RENAME_OBJECT && pItem->zAlias ){
            sqlite3RenameTokenRemap(pParse, 0, (void*)&pExpr->y.pTab);
          }
        }
        if( 0==(cntTab++) ){
          pMatch = pItem;
        }
        hCol = sqlite3StrIHash(zCol);
        for(j=0, pCol=pTab->aCol; j<pTab->nCol; j++, pCol++){
          if( pCol->hName==hCol && sqlite3StrICmp(pCol->zName, zCol)==0 ){
            /* If there has been exactly one prior match and this match
            ** is for the right-hand table of a NATURAL JOIN or is in a 
            ** USING clause, then skip this match.
            */
            if( cnt==1 ){
              if( pItem->fg.jointype & JT_NATURAL ) continue;
              if( nameInUsingClause(pItem->pUsing, zCol) ) continue;
................................................................................
          pExpr->iTable = 2;
        }
      }
#endif /* SQLITE_OMIT_UPSERT */

      if( pTab ){ 
        int iCol;
        u8 hCol = sqlite3StrIHash(zCol);
        pSchema = pTab->pSchema;
        cntTab++;
        for(iCol=0, pCol=pTab->aCol; iCol<pTab->nCol; iCol++, pCol++){
          if( pCol->hName==hCol && sqlite3StrICmp(pCol->zName, zCol)==0 ){
            if( iCol==pTab->iPKey ){
              iCol = -1;
            }
            break;
          }
        }
        if( iCol>=pTab->nCol && sqlite3IsRowid(zCol) && VisibleRowid(pTab) ){
................................................................................
  ** avoid setting bits beyond the maximum column number of the table.
  ** (See ticket [b92e5e8ec2cdbaa1]).
  **
  ** If a generated column is referenced, set bits for every column
  ** of the table.
  */
  if( pExpr->iColumn>=0 && pMatch!=0 ){














    pMatch->colUsed |= sqlite3ExprColUsed(pExpr);

  }

  /* Clean up and return
  */
  sqlite3ExprDelete(db, pExpr->pLeft);
  pExpr->pLeft = 0;
  sqlite3ExprDelete(db, pExpr->pRight);
................................................................................
          /* For the purposes of the EP_ConstFunc flag, date and time
          ** functions and other functions that change slowly are considered
          ** constant because they are constant for the duration of one query.
          ** This allows them to be factored out of inner loops. */
          ExprSetProperty(pExpr,EP_ConstFunc);
        }
        if( (pDef->funcFlags & SQLITE_FUNC_CONSTANT)==0 ){
          /* Clearly non-deterministic functions like random(), but also
          ** date/time functions that use 'now', and other functions like
          ** sqlite_version() that might change over time cannot be used

          ** in an index or generated column.  Curiously, they can be used
          ** in a CHECK constraint.  SQLServer, MySQL, and PostgreSQL all
          ** all this. */
          sqlite3ResolveNotValid(pParse, pNC, "non-deterministic functions",

                                 NC_IdxExpr|NC_PartIdx|NC_GenCol, 0);
        }else{
          assert( (NC_SelfRef & 0xff)==NC_SelfRef ); /* Must fit in 8 bits */
          pExpr->op2 = pNC->ncFlags & NC_SelfRef;
          if( pNC->ncFlags & NC_FromDDL ) ExprSetProperty(pExpr, EP_FromDDL);
        }
        if( (pDef->funcFlags & SQLITE_FUNC_INTERNAL)!=0
         && pParse->nested==0
................................................................................
    }
    case TK_IS:
    case TK_ISNOT: {
      Expr *pRight = sqlite3ExprSkipCollateAndLikely(pExpr->pRight);
      assert( !ExprHasProperty(pExpr, EP_Reduced) );
      /* Handle special cases of "x IS TRUE", "x IS FALSE", "x IS NOT TRUE",
      ** and "x IS NOT FALSE". */
      if( pRight && pRight->op==TK_ID ){
        int rc = resolveExprStep(pWalker, pRight);
        if( rc==WRC_Abort ) return WRC_Abort;
        if( pRight->op==TK_TRUEFALSE ){
          pExpr->op2 = pExpr->op;
          pExpr->op = TK_TRUTH;
          return WRC_Continue;
        }
................................................................................
  nc.pParse = pParse;
  nc.pSrcList = pSelect->pSrc;
  nc.uNC.pEList = pEList;
  nc.ncFlags = NC_AllowAgg|NC_UEList;
  nc.nErr = 0;
  db = pParse->db;
  savedSuppErr = db->suppressErr;
  if( IN_RENAME_OBJECT==0 ) db->suppressErr = 1;
  rc = sqlite3ResolveExprNames(&nc, pE);
  db->suppressErr = savedSuppErr;
  if( rc ) return 0;

  /* Try to match the ORDER BY expression against an expression
  ** in the result set.  Return an 1-based index of the matching
  ** result-set entry.
................................................................................
** list rather than a single expression.
*/
SQLITE_PRIVATE int sqlite3ResolveExprListNames( 
  NameContext *pNC,       /* Namespace to resolve expressions in. */
  ExprList *pList         /* The expression list to be analyzed. */
){
  int i;
  int savedHasAgg = 0;
  Walker w;
  if( pList==0 ) return WRC_Continue;
  w.pParse = pNC->pParse;
  w.xExprCallback = resolveExprStep;
  w.xSelectCallback = resolveSelectStep;
  w.xSelectCallback2 = 0;
  w.u.pNC = pNC;
  savedHasAgg = pNC->ncFlags & (NC_HasAgg|NC_MinMaxAgg|NC_HasWin);
  pNC->ncFlags &= ~(NC_HasAgg|NC_MinMaxAgg|NC_HasWin);
  for(i=0; i<pList->nExpr; i++){
    Expr *pExpr = pList->a[i].pExpr;
    if( pExpr==0 ) continue;
#if SQLITE_MAX_EXPR_DEPTH>0
    w.pParse->nHeight += pExpr->nHeight;
    if( sqlite3ExprCheckHeight(w.pParse, w.pParse->nHeight) ){
      return WRC_Abort;
    }
#endif
    sqlite3WalkExpr(&w, pExpr);
#if SQLITE_MAX_EXPR_DEPTH>0
    w.pParse->nHeight -= pExpr->nHeight;
#endif
    assert( EP_Agg==NC_HasAgg );
    assert( EP_Win==NC_HasWin );
    testcase( pNC->ncFlags & NC_HasAgg );
    testcase( pNC->ncFlags & NC_HasWin );
    if( pNC->ncFlags & (NC_HasAgg|NC_MinMaxAgg|NC_HasWin) ){
      ExprSetProperty(pExpr, pNC->ncFlags & (NC_HasAgg|NC_HasWin) );
      savedHasAgg |= pNC->ncFlags & (NC_HasAgg|NC_MinMaxAgg|NC_HasWin);
      pNC->ncFlags &= ~(NC_HasAgg|NC_MinMaxAgg|NC_HasWin);
    }
    if( pNC->nErr>0 || w.pParse->nErr>0 ) return WRC_Abort;
  }
  pNC->ncFlags |= savedHasAgg;
  return WRC_Continue;
}

/*
** Resolve all names in all expressions of a SELECT and in all
** decendents of the SELECT, including compounds off of p->pPrior,
** subqueries in expressions, and subqueries used as FROM clause
................................................................................
** have an affinity:
**
** CREATE TABLE t1(a);
** SELECT * FROM t1 WHERE a;
** SELECT a AS b FROM t1 WHERE b;
** SELECT * FROM t1 WHERE (select a from t1);
*/
SQLITE_PRIVATE char sqlite3ExprAffinity(const Expr *pExpr){
  int op;
  while( ExprHasProperty(pExpr, EP_Skip) ){
    assert( pExpr->op==TK_COLLATE || pExpr->op==TK_IF_NULL_ROW );
    pExpr = pExpr->pLeft;
    assert( pExpr!=0 );
  }
  op = pExpr->op;
  if( op==TK_SELECT ){
    assert( pExpr->flags&EP_xIsSelect );
    return sqlite3ExprAffinity(pExpr->x.pSelect->pEList->a[0].pExpr);
................................................................................
}

/*
** Skip over any TK_COLLATE operators.
*/
SQLITE_PRIVATE Expr *sqlite3ExprSkipCollate(Expr *pExpr){
  while( pExpr && ExprHasProperty(pExpr, EP_Skip) ){
    assert( pExpr->op==TK_COLLATE || pExpr->op==TK_IF_NULL_ROW );
    pExpr = pExpr->pLeft;
  }   
  return pExpr;
}

/*
** Skip over any TK_COLLATE operators and/or any unlikely()
................................................................................
  while( pExpr && ExprHasProperty(pExpr, EP_Skip|EP_Unlikely) ){
    if( ExprHasProperty(pExpr, EP_Unlikely) ){
      assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
      assert( pExpr->x.pList->nExpr>0 );
      assert( pExpr->op==TK_FUNCTION );
      pExpr = pExpr->x.pList->a[0].pExpr;
    }else{
      assert( pExpr->op==TK_COLLATE || pExpr->op==TK_IF_NULL_ROW );
      pExpr = pExpr->pLeft;
    }
  }   
  return pExpr;
}

/*
................................................................................
** default collation if pExpr has no defined collation.
**
** The collating sequence might be determined by a COLLATE operator
** or by the presence of a column with a defined collating sequence.
** COLLATE operators take first precedence.  Left operands take
** precedence over right operands.
*/
SQLITE_PRIVATE CollSeq *sqlite3ExprCollSeq(Parse *pParse, const Expr *pExpr){
  sqlite3 *db = pParse->db;
  CollSeq *pColl = 0;
  const Expr *p = pExpr;
  while( p ){
    int op = p->op;
    if( op==TK_REGISTER ) op = p->op2;
    if( (op==TK_AGG_COLUMN || op==TK_COLUMN || op==TK_TRIGGER)
     && p->y.pTab!=0
    ){
      /* op==TK_REGISTER && p->y.pTab!=0 happens when pExpr was originally
................................................................................
** defautl collation sequence.
**
** See also: sqlite3ExprCollSeq()
**
** The sqlite3ExprCollSeq() routine works the same except that it
** returns NULL if there is no defined collation.
*/
SQLITE_PRIVATE CollSeq *sqlite3ExprNNCollSeq(Parse *pParse, const Expr *pExpr){
  CollSeq *p = sqlite3ExprCollSeq(pParse, pExpr);
  if( p==0 ) p = pParse->db->pDfltColl;
  assert( p!=0 );
  return p;
}

/*
** Return TRUE if the two expressions have equivalent collating sequences.
*/
SQLITE_PRIVATE int sqlite3ExprCollSeqMatch(Parse *pParse, const Expr *pE1, const Expr *pE2){
  CollSeq *pColl1 = sqlite3ExprNNCollSeq(pParse, pE1);
  CollSeq *pColl2 = sqlite3ExprNNCollSeq(pParse, pE2);
  return sqlite3StrICmp(pColl1->zName, pColl2->zName)==0;
}

/*
** pExpr is an operand of a comparison operator.  aff2 is the
** type affinity of the other operand.  This routine returns the
** type affinity that should be used for the comparison operator.
*/
SQLITE_PRIVATE char sqlite3CompareAffinity(const Expr *pExpr, char aff2){
  char aff1 = sqlite3ExprAffinity(pExpr);
  if( aff1>SQLITE_AFF_NONE && aff2>SQLITE_AFF_NONE ){
    /* Both sides of the comparison are columns. If one has numeric
    ** affinity, use that. Otherwise use no affinity.
    */
    if( sqlite3IsNumericAffinity(aff1) || sqlite3IsNumericAffinity(aff2) ){
      return SQLITE_AFF_NUMERIC;
................................................................................
  }
}

/*
** pExpr is a comparison operator.  Return the type affinity that should
** be applied to both operands prior to doing the comparison.
*/
static char comparisonAffinity(const Expr *pExpr){
  char aff;
  assert( pExpr->op==TK_EQ || pExpr->op==TK_IN || pExpr->op==TK_LT ||
          pExpr->op==TK_GT || pExpr->op==TK_GE || pExpr->op==TK_LE ||
          pExpr->op==TK_NE || pExpr->op==TK_IS || pExpr->op==TK_ISNOT );
  assert( pExpr->pLeft );
  aff = sqlite3ExprAffinity(pExpr->pLeft);
  if( pExpr->pRight ){
................................................................................

/*
** pExpr is a comparison expression, eg. '=', '<', IN(...) etc.
** idx_affinity is the affinity of an indexed column. Return true
** if the index with affinity idx_affinity may be used to implement
** the comparison in pExpr.
*/
SQLITE_PRIVATE int sqlite3IndexAffinityOk(const Expr *pExpr, char idx_affinity){
  char aff = comparisonAffinity(pExpr);
  if( aff<SQLITE_AFF_TEXT ){
    return 1;
  }
  if( aff==SQLITE_AFF_TEXT ){
    return idx_affinity==SQLITE_AFF_TEXT;
  }
................................................................................
  return sqlite3IsNumericAffinity(idx_affinity);
}

/*
** Return the P5 value that should be used for a binary comparison
** opcode (OP_Eq, OP_Ge etc.) used to compare pExpr1 and pExpr2.
*/
static u8 binaryCompareP5(
  const Expr *pExpr1,   /* Left operand */
  const Expr *pExpr2,   /* Right operand */
  int jumpIfNull        /* Extra flags added to P5 */
){
  u8 aff = (char)sqlite3ExprAffinity(pExpr2);
  aff = (u8)sqlite3CompareAffinity(pExpr1, aff) | (u8)jumpIfNull;
  return aff;
}

/*
** Return a pointer to the collation sequence that should be used by
................................................................................
** type.
**
** Argument pRight (but not pLeft) may be a null pointer. In this case,
** it is not considered.
*/
SQLITE_PRIVATE CollSeq *sqlite3BinaryCompareCollSeq(
  Parse *pParse, 
  const Expr *pLeft, 
  const Expr *pRight
){
  CollSeq *pColl;
  assert( pLeft );
  if( pLeft->flags & EP_Collate ){
    pColl = sqlite3ExprCollSeq(pParse, pLeft);
  }else if( pRight && (pRight->flags & EP_Collate)!=0 ){
    pColl = sqlite3ExprCollSeq(pParse, pRight);
................................................................................
** appropriate for the comparison operator.
**
** This is normally just a wrapper around sqlite3BinaryCompareCollSeq().
** However, if the OP_Commuted flag is set, then the order of the operands
** is reversed in the sqlite3BinaryCompareCollSeq() call so that the
** correct collating sequence is found.
*/
SQLITE_PRIVATE CollSeq *sqlite3ExprCompareCollSeq(Parse *pParse, const Expr *p){
  if( ExprHasProperty(p, EP_Commuted) ){
    return sqlite3BinaryCompareCollSeq(pParse, p->pRight, p->pLeft);
  }else{
    return sqlite3BinaryCompareCollSeq(pParse, p->pLeft, p->pRight);
  }
}

................................................................................
  int i;
  int regLeft = 0;
  int regRight = 0;
  u8 opx = op;
  int addrDone = sqlite3VdbeMakeLabel(pParse);
  int isCommuted = ExprHasProperty(pExpr,EP_Commuted);

  assert( !ExprHasVVAProperty(pExpr,EP_Immutable) );
  if( pParse->nErr ) return;
  if( nLeft!=sqlite3ExprVectorSize(pRight) ){
    sqlite3ErrorMsg(pParse, "row value misused");
    return;
  }
  assert( pExpr->op==TK_EQ || pExpr->op==TK_NE 
       || pExpr->op==TK_IS || pExpr->op==TK_ISNOT 
................................................................................
#endif
  ){
    nSize = EXPR_FULLSIZE;
  }else{
    assert( !ExprHasProperty(p, EP_TokenOnly|EP_Reduced) );
    assert( !ExprHasProperty(p, EP_FromJoin) ); 
    assert( !ExprHasProperty(p, EP_MemToken) );
    assert( !ExprHasVVAProperty(p, EP_NoReduce) );
    if( p->pLeft || p->x.pList ){
      nSize = EXPR_REDUCEDSIZE | EP_Reduced;
    }else{
      assert( p->pRight==0 );
      nSize = EXPR_TOKENONLYSIZE | EP_TokenOnly;
    }
  }
................................................................................
      }
    }

    /* Set the EP_Reduced, EP_TokenOnly, and EP_Static flags appropriately. */
    pNew->flags &= ~(EP_Reduced|EP_TokenOnly|EP_Static|EP_MemToken);
    pNew->flags |= nStructSize & (EP_Reduced|EP_TokenOnly);
    pNew->flags |= staticFlag;
    ExprClearVVAProperties(pNew);
    if( dupFlags ){
      ExprSetVVAProperty(pNew, EP_Immutable);
    }

    /* Copy the p->u.zToken string, if any. */
    if( nToken ){
      char *zToken = pNew->u.zToken = (char*)&zAlloc[nNewSize];
      memcpy(zToken, p->u.zToken, nToken);
    }

................................................................................
SQLITE_PRIVATE void sqlite3ExprListSetName(
  Parse *pParse,          /* Parsing context */
  ExprList *pList,        /* List to which to add the span. */
  Token *pName,           /* Name to be added */
  int dequote             /* True to cause the name to be dequoted */
){
  assert( pList!=0 || pParse->db->mallocFailed!=0 );
  assert( pParse->eParseMode!=PARSE_MODE_UNMAP || dequote==0 );
  if( pList ){
    struct ExprList_item *pItem;
    assert( pList->nExpr>0 );
    pItem = &pList->a[pList->nExpr-1];
    assert( pItem->zEName==0 );
    assert( pItem->eEName==ENAME_NAME );
    pItem->zEName = sqlite3DbStrNDup(pParse->db, pName->z, pName->n);
    if( dequote ){
      /* If dequote==0, then pName->z does not point to part of a DDL
      ** statement handled by the parser. And so no token need be added
      ** to the token-map.  */
      sqlite3Dequote(pItem->zEName);
      if( IN_RENAME_OBJECT ){
        sqlite3RenameTokenMap(pParse, (void*)pItem->zEName, pName);
      }
    }
  }
}

/*
** Set the ExprList.a[].zSpan element of the most recently added item
** on the expression list.
................................................................................
**   (2) the expression does originate in the ON or USING clause
**       of a LEFT JOIN, and
**   (3) the expression does not contain any EP_FixedCol TK_COLUMN
**       operands created by the constant propagation optimization.
**
** When this routine returns true, it indicates that the expression
** can be added to the pParse->pConstExpr list and evaluated once when
** the prepared statement starts up.  See sqlite3ExprCodeRunJustOnce().
*/
SQLITE_PRIVATE int sqlite3ExprIsConstantNotJoin(Expr *p){
  return exprIsConst(p, 2, 0);
}

/*
** Walk an expression tree.  Return non-zero if the expression is constant
................................................................................
      sqlite3VdbeAddOp2(v, OP_OpenDup, iTab, pExpr->iTable);
      sqlite3VdbeJumpHere(v, addrOnce);
      return;
    }

    /* Begin coding the subroutine */
    ExprSetProperty(pExpr, EP_Subrtn);
    assert( !ExprHasProperty(pExpr, EP_TokenOnly|EP_Reduced) );
    pExpr->y.sub.regReturn = ++pParse->nMem;
    pExpr->y.sub.iAddr =
      sqlite3VdbeAddOp2(v, OP_Integer, 0, pExpr->y.sub.regReturn) + 1;
    VdbeComment((v, "return address"));

    addrOnce = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
  }
................................................................................
    int i;
    ExprList *pList = pExpr->x.pList;
    struct ExprList_item *pItem;
    int r1, r2;
    affinity = sqlite3ExprAffinity(pLeft);
    if( affinity<=SQLITE_AFF_NONE ){
      affinity = SQLITE_AFF_BLOB;
    }else if( affinity==SQLITE_AFF_REAL ){
      affinity = SQLITE_AFF_NUMERIC;
    }
    if( pKeyInfo ){
      assert( sqlite3KeyInfoIsWriteable(pKeyInfo) );
      pKeyInfo->aColl[0] = sqlite3ExprCollSeq(pParse, pExpr->pLeft);
    }

    /* Loop through each expression in <exprlist>. */
................................................................................
  int i;                /* loop counter */
  int destStep2;        /* Where to jump when NULLs seen in step 2 */
  int destStep6 = 0;    /* Start of code for Step 6 */
  int addrTruthOp;      /* Address of opcode that determines the IN is true */
  int destNotNull;      /* Jump here if a comparison is not true in step 6 */
  int addrTop;          /* Top of the step-6 loop */ 
  int iTab = 0;         /* Index to use */
  u8 okConstFactor = pParse->okConstFactor;

  assert( !ExprHasVVAProperty(pExpr,EP_Immutable) );
  pLeft = pExpr->pLeft;
  if( sqlite3ExprCheckIN(pParse, pExpr) ) return;
  zAff = exprINAffinity(pParse, pExpr);
  nVector = sqlite3ExprVectorSize(pExpr->pLeft);
  aiMap = (int*)sqlite3DbMallocZero(
      pParse->db, nVector*(sizeof(int) + sizeof(char)) + 1
  );
................................................................................
  ** vector, then it is stored in an array of nVector registers starting 
  ** at r1.
  **
  ** sqlite3FindInIndex() might have reordered the fields of the LHS vector
  ** so that the fields are in the same order as an existing index.   The
  ** aiMap[] array contains a mapping from the original LHS field order to
  ** the field order that matches the RHS index.
  **
  ** Avoid factoring the LHS of the IN(...) expression out of the loop,
  ** even if it is constant, as OP_Affinity may be used on the register
  ** by code generated below.  */
  assert( pParse->okConstFactor==okConstFactor );
  pParse->okConstFactor = 0;
  rLhsOrig = exprCodeVector(pParse, pLeft, &iDummy);
  pParse->okConstFactor = okConstFactor;
  for(i=0; i<nVector && aiMap[i]==i; i++){} /* Are LHS fields reordered? */
  if( i==nVector ){
    /* LHS fields are not reordered */
    rLhs = rLhsOrig;
  }else{
    /* Need to reorder the LHS fields according to aiMap */
    rLhs = sqlite3GetTempRange(pParse, nVector);
................................................................................
  if( eType==IN_INDEX_NOOP ){
    ExprList *pList = pExpr->x.pList;
    CollSeq *pColl = sqlite3ExprCollSeq(pParse, pExpr->pLeft);
    int labelOk = sqlite3VdbeMakeLabel(pParse);
    int r2, regToFree;
    int regCkNull = 0;
    int ii;

    assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
    if( destIfNull!=destIfFalse ){
      regCkNull = sqlite3GetTempReg(pParse);
      sqlite3VdbeAddOp3(v, OP_BitAnd, rLhs, rLhs, regCkNull);
    }

    for(ii=0; ii<pList->nExpr; ii++){





      r2 = sqlite3ExprCodeTemp(pParse, pList->a[ii].pExpr, &regToFree);

      if( regCkNull && sqlite3ExprCanBeNull(pList->a[ii].pExpr) ){
        sqlite3VdbeAddOp3(v, OP_BitAnd, regCkNull, r2, regCkNull);
      }
      sqlite3ReleaseTempReg(pParse, regToFree);
      if( ii<pList->nExpr-1 || destIfNull!=destIfFalse ){
        int op = rLhs!=r2 ? OP_Eq : OP_NotNull;
        sqlite3VdbeAddOp4(v, op, rLhs, labelOk, r2,
................................................................................
  assert( v!=0 );
  assert( pParse->iSelfTab!=0 );
  if( pParse->iSelfTab>0 ){
    iAddr = sqlite3VdbeAddOp3(v, OP_IfNullRow, pParse->iSelfTab-1, 0, regOut);
  }else{
    iAddr = 0;
  }
  sqlite3ExprCodeCopy(pParse, pCol->pDflt, regOut);
  if( pCol->affinity>=SQLITE_AFF_TEXT ){
    sqlite3VdbeAddOp4(v, OP_Affinity, regOut, 1, 0, &pCol->affinity, 1);
  }
  if( iAddr ) sqlite3VdbeJumpHere(v, iAddr);
}
#endif /* SQLITE_OMIT_GENERATED_COLUMNS */

................................................................................
      for(i=0; i<nResult; i++){
        sqlite3ExprCodeFactorable(pParse, p->x.pList->a[i].pExpr, i+iResult);
      }
    }
  }
  return iResult;
}

/*
** If the last opcode is a OP_Copy, then set the do-not-merge flag (p5)
** so that a subsequent copy will not be merged into this one.
*/
static void setDoNotMergeFlagOnCopy(Vdbe *v){
  if( sqlite3VdbeGetOp(v, -1)->opcode==OP_Copy ){
    sqlite3VdbeChangeP5(v, 1);  /* Tag trailing OP_Copy as not mergable */
  }
}

/*
** Generate code to implement special SQL functions that are implemented
** in-line rather than by using the usual callbacks.
*/
static int exprCodeInlineFunction(
  Parse *pParse,        /* Parsing context */
................................................................................
      assert( nFarg>=2 );
      sqlite3ExprCode(pParse, pFarg->a[0].pExpr, target);
      for(i=1; i<nFarg; i++){
        sqlite3VdbeAddOp2(v, OP_NotNull, target, endCoalesce);
        VdbeCoverage(v);
        sqlite3ExprCode(pParse, pFarg->a[i].pExpr, target);
      }
      setDoNotMergeFlagOnCopy(v);


      sqlite3VdbeResolveLabel(v, endCoalesce);
      break;
    }
    case INLINEFUNC_iif: {
      Expr caseExpr;
      memset(&caseExpr, 0, sizeof(caseExpr));
      caseExpr.op = TK_CASE;
      caseExpr.x.pList = pFarg;
      return sqlite3ExprCodeTarget(pParse, &caseExpr, target);
    }

    default: {   
      /* The UNLIKELY() function is a no-op.  The result is the value
      ** of the first argument.
      */
      assert( nFarg==1 || nFarg==2 );
      target = sqlite3ExprCodeTarget(pParse, pFarg->a[0].pExpr, target);
................................................................................
    return 0;
  }

expr_code_doover:
  if( pExpr==0 ){
    op = TK_NULL;
  }else{
    assert( !ExprHasVVAProperty(pExpr,EP_Immutable) );
    op = pExpr->op;
  }
  switch( op ){
    case TK_AGG_COLUMN: {
      AggInfo *pAggInfo = pExpr->pAggInfo;
      struct AggInfo_col *pCol = &pAggInfo->aCol[pExpr->iAgg];
      if( !pAggInfo->directMode ){
        assert( pCol->iMem>0 );
        return pCol->iMem;
      }else if( pAggInfo->useSortingIdx ){
        Table *pTab = pCol->pTab;
        sqlite3VdbeAddOp3(v, OP_Column, pAggInfo->sortingIdxPTab,
                              pCol->iSorterColumn, target);
        if( pCol->iColumn<0 ){
          VdbeComment((v,"%s.rowid",pTab->zName));
        }else{
          VdbeComment((v,"%s.%s",pTab->zName,pTab->aCol[pCol->iColumn].zName));
          if( pTab->aCol[pCol->iColumn].affinity==SQLITE_AFF_REAL ){
            sqlite3VdbeAddOp1(v, OP_RealAffinity, target);
          }
        }
        return target;
      }
      /* Otherwise, fall thru into the TK_COLUMN case */
    }
    case TK_COLUMN: {
      int iTab = pExpr->iTable;
      int iReg;
................................................................................
        }else{
          aff = pExpr->affExpr;
        }
        if( aff>SQLITE_AFF_BLOB ){
          static const char zAff[] = "B\000C\000D\000E";
          assert( SQLITE_AFF_BLOB=='A' );
          assert( SQLITE_AFF_TEXT=='B' );




          sqlite3VdbeAddOp4(v, OP_Affinity, iReg, 1, 0,
                            &zAff[(aff-'B')*2], P4_STATIC);
        }
        return iReg;
      }
      if( iTab<0 ){
        if( pParse->iSelfTab<0 ){
................................................................................
        codeReal(v, pLeft->u.zToken, 1, target);
        return target;
#endif
      }else{
        tempX.op = TK_INTEGER;
        tempX.flags = EP_IntValue|EP_TokenOnly;
        tempX.u.iValue = 0;
        ExprClearVVAProperties(&tempX);
        r1 = sqlite3ExprCodeTemp(pParse, &tempX, &regFree1);
        r2 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree2);
        sqlite3VdbeAddOp3(v, OP_Subtract, r2, r1, target);
        testcase( regFree2==0 );
      }
      break;
    }
................................................................................
#ifndef SQLITE_OMIT_WINDOWFUNC
      if( ExprHasProperty(pExpr, EP_WinFunc) ){
        return pExpr->y.pWin->regResult;
      }
#endif

      if( ConstFactorOk(pParse) && sqlite3ExprIsConstantNotJoin(pExpr) ){
        /* SQL functions can be expensive. So try to avoid running them
        ** multiple times if we know they always give the same result */
        return sqlite3ExprCodeRunJustOnce(pParse, pExpr, -1);
      }
      assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
      assert( !ExprHasProperty(pExpr, EP_TokenOnly) );


      pFarg = pExpr->x.pList;

      nFarg = pFarg ? pFarg->nExpr : 0;
      assert( !ExprHasProperty(pExpr, EP_IntValue) );
      zId = pExpr->u.zToken;
      pDef = sqlite3FindFunction(db, zId, nFarg, enc, 0);
#ifdef SQLITE_ENABLE_UNKNOWN_SQL_FUNCTION
      if( pDef==0 && pParse->explain ){
        pDef = sqlite3FindFunction(db, "unknown", nFarg, enc, 0);
................................................................................
      }
      if( (nExpr&1)!=0 ){
        sqlite3ExprCode(pParse, pEList->a[nExpr-1].pExpr, target);
      }else{
        sqlite3VdbeAddOp2(v, OP_Null, 0, target);
      }
      sqlite3ExprDelete(db, pDel);
      setDoNotMergeFlagOnCopy(v);
      sqlite3VdbeResolveLabel(v, endLabel);
      break;
    }
#ifndef SQLITE_OMIT_TRIGGER
    case TK_RAISE: {
      assert( pExpr->affExpr==OE_Rollback 
           || pExpr->affExpr==OE_Abort
           || pExpr->affExpr==OE_Fail
           || pExpr->affExpr==OE_Ignore
      );
      if( !pParse->pTriggerTab && !pParse->nested ){
        sqlite3ErrorMsg(pParse,
                       "RAISE() may only be used within a trigger-program");
        return 0;
      }
      if( pExpr->affExpr==OE_Abort ){
        sqlite3MayAbort(pParse);
      }
      assert( !ExprHasProperty(pExpr, EP_IntValue) );
      if( pExpr->affExpr==OE_Ignore ){
        sqlite3VdbeAddOp4(
            v, OP_Halt, SQLITE_OK, OE_Ignore, 0, pExpr->u.zToken,0);
        VdbeCoverage(v);
      }else{
        sqlite3HaltConstraint(pParse,
             pParse->pTriggerTab ? SQLITE_CONSTRAINT_TRIGGER : SQLITE_ERROR,
             pExpr->affExpr, pExpr->u.zToken, 0, 0);
      }

      break;
    }
#endif
  }
  sqlite3ReleaseTempReg(pParse, regFree1);
  sqlite3ReleaseTempReg(pParse, regFree2);
  return inReg;
}

/*
** Generate code that will evaluate expression pExpr just one time
** per prepared statement execution.
**
** If the expression uses functions (that might throw an exception) then
** guard them with an OP_Once opcode to ensure that the code is only executed
** once. If no functions are involved, then factor the code out and put it at
** the end of the prepared statement in the initialization section.
**
** If regDest>=0 then the result is always stored in that register and the
** result is not reusable.  If regDest<0 then this routine is free to 
** store the value whereever it wants.  The register where the expression 
** is stored is returned.  When regDest<0, two identical expressions might
** code to the same register, if they do not contain function calls and hence
** are factored out into the initialization section at the end of the
** prepared statement.
*/
SQLITE_PRIVATE int sqlite3ExprCodeRunJustOnce(
  Parse *pParse,    /* Parsing context */
  Expr *pExpr,      /* The expression to code when the VDBE initializes */
  int regDest       /* Store the value in this register */
){
  ExprList *p;
  assert( ConstFactorOk(pParse) );
  p = pParse->pConstExpr;
................................................................................
    for(pItem=p->a, i=p->nExpr; i>0; pItem++, i--){
      if( pItem->reusable && sqlite3ExprCompare(0,pItem->pExpr,pExpr,-1)==0 ){
        return pItem->u.iConstExprReg;
      }
    }
  }
  pExpr = sqlite3ExprDup(pParse->db, pExpr, 0);
  if( pExpr!=0 && ExprHasProperty(pExpr, EP_HasFunc) ){
    Vdbe *v = pParse->pVdbe;
    int addr;
    assert( v );
    addr = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
    pParse->okConstFactor = 0;
    if( !pParse->db->mallocFailed ){
      if( regDest<0 ) regDest = ++pParse->nMem;
      sqlite3ExprCode(pParse, pExpr, regDest);
    }
    pParse->okConstFactor = 1;
    sqlite3ExprDelete(pParse->db, pExpr);
    sqlite3VdbeJumpHere(v, addr);
  }else{
    p = sqlite3ExprListAppend(pParse, p, pExpr);
    if( p ){
       struct ExprList_item *pItem = &p->a[p->nExpr-1];
       pItem->reusable = regDest<0;
       if( regDest<0 ) regDest = ++pParse->nMem;
       pItem->u.iConstExprReg = regDest;
    }
    pParse->pConstExpr = p;
  }
  return regDest;
}

/*
** Generate code to evaluate an expression and store the results
** into a register.  Return the register number where the results
** are stored.
................................................................................
  int r2;
  pExpr = sqlite3ExprSkipCollateAndLikely(pExpr);
  if( ConstFactorOk(pParse)
   && pExpr->op!=TK_REGISTER
   && sqlite3ExprIsConstantNotJoin(pExpr)
  ){
    *pReg  = 0;
    r2 = sqlite3ExprCodeRunJustOnce(pParse, pExpr, -1);
  }else{
    int r1 = sqlite3GetTempReg(pParse);
    r2 = sqlite3ExprCodeTarget(pParse, pExpr, r1);
    if( r2==r1 ){
      *pReg = r1;
    }else{
      sqlite3ReleaseTempReg(pParse, r1);
................................................................................
** Generate code that will evaluate expression pExpr and store the
** results in register target.  The results are guaranteed to appear
** in register target.
*/
SQLITE_PRIVATE void sqlite3ExprCode(Parse *pParse, Expr *pExpr, int target){
  int inReg;

  assert( pExpr==0 || !ExprHasVVAProperty(pExpr,EP_Immutable) );
  assert( target>0 && target<=pParse->nMem );
  inReg = sqlite3ExprCodeTarget(pParse, pExpr, target);
  assert( pParse->pVdbe!=0 || pParse->db->mallocFailed );
  if( inReg!=target && pParse->pVdbe ){
    u8 op;
    if( ExprHasProperty(pExpr,EP_Subquery) ){
      op = OP_Copy;
................................................................................
** Generate code that will evaluate expression pExpr and store the
** results in register target.  The results are guaranteed to appear
** in register target.  If the expression is constant, then this routine
** might choose to code the expression at initialization time.
*/
SQLITE_PRIVATE void sqlite3ExprCodeFactorable(Parse *pParse, Expr *pExpr, int target){
  if( pParse->okConstFactor && sqlite3ExprIsConstantNotJoin(pExpr) ){
    sqlite3ExprCodeRunJustOnce(pParse, pExpr, target);
  }else{
    sqlite3ExprCodeCopy(pParse, pExpr, target);
  }
}

/*
** Generate code that pushes the value of every element of the given
** expression list into a sequence of registers beginning at target.
**
................................................................................
        n--;
      }else{
        sqlite3VdbeAddOp2(v, copyOp, j+srcReg-1, target+i);
      }
    }else if( (flags & SQLITE_ECEL_FACTOR)!=0
           && sqlite3ExprIsConstantNotJoin(pExpr)
    ){
      sqlite3ExprCodeRunJustOnce(pParse, pExpr, target+i);
    }else{
      int inReg = sqlite3ExprCodeTarget(pParse, pExpr, target+i);
      if( inReg!=target+i ){
        VdbeOp *pOp;
        if( copyOp==OP_Copy
         && (pOp=sqlite3VdbeGetOp(v, -1))->opcode==OP_Copy
         && pOp->p1+pOp->p3+1==inReg
................................................................................
  int regFree1 = 0;
  int regFree2 = 0;
  int r1, r2;

  assert( jumpIfNull==SQLITE_JUMPIFNULL || jumpIfNull==0 );
  if( NEVER(v==0) )     return;  /* Existence of VDBE checked by caller */
  if( NEVER(pExpr==0) ) return;  /* No way this can happen */
  assert( !ExprHasVVAProperty(pExpr, EP_Immutable) );
  op = pExpr->op;
  switch( op ){
    case TK_AND:
    case TK_OR: {
      Expr *pAlt = sqlite3ExprSimplifiedAndOr(pExpr);
      if( pAlt!=pExpr ){
        sqlite3ExprIfTrue(pParse, pAlt, dest, jumpIfNull);
................................................................................
  int regFree1 = 0;
  int regFree2 = 0;
  int r1, r2;

  assert( jumpIfNull==SQLITE_JUMPIFNULL || jumpIfNull==0 );
  if( NEVER(v==0) ) return; /* Existence of VDBE checked by caller */
  if( pExpr==0 )    return;
  assert( !ExprHasVVAProperty(pExpr,EP_Immutable) );

  /* The value of pExpr->op and op are related as follows:
  **
  **       pExpr->op            op
  **       ---------          ----------
  **       TK_ISNULL          OP_NotNull
  **       TK_NOTNULL         OP_IsNull
................................................................................
      if( sqlite3_stricmp(pA->u.zToken,pB->u.zToken)!=0 ) return 2;
    }else if( ALWAYS(pB->u.zToken!=0) && strcmp(pA->u.zToken,pB->u.zToken)!=0 ){
      return 2;
    }
  }
  if( (pA->flags & (EP_Distinct|EP_Commuted))
     != (pB->flags & (EP_Distinct|EP_Commuted)) ) return 2;
  if( ALWAYS((combinedFlags & EP_TokenOnly)==0) ){
    if( combinedFlags & EP_xIsSelect ) return 2;
    if( (combinedFlags & EP_FixedCol)==0
     && sqlite3ExprCompare(pParse, pA->pLeft, pB->pLeft, iTab) ) return 2;
    if( sqlite3ExprCompare(pParse, pA->pRight, pB->pRight, iTab) ) return 2;
    if( sqlite3ExprListCompare(pA->x.pList, pB->x.pList, iTab) ) return 2;
    if( pA->op!=TK_STRING
     && pA->op!=TK_TRUEFALSE
     && ALWAYS((combinedFlags & EP_Reduced)==0)
    ){
      if( pA->iColumn!=pB->iColumn ) return 2;
      if( pA->op2!=pB->op2 && pA->op==TK_TRUTH ) return 2;














      if( pA->op!=TK_IN && pA->iTable!=pB->iTable && pA->iTable!=iTab ){
        return 2;
      }
    }
  }
  return 0;
}
................................................................................
    ** a term of the form x=y does not prove that y is not null if x
    ** is the column of a virtual table */
    case TK_EQ:
    case TK_NE:
    case TK_LT:
    case TK_LE:
    case TK_GT:
    case TK_GE: {
      Expr *pLeft = pExpr->pLeft;
      Expr *pRight = pExpr->pRight;
      testcase( pExpr->op==TK_EQ );
      testcase( pExpr->op==TK_NE );
      testcase( pExpr->op==TK_LT );
      testcase( pExpr->op==TK_LE );
      testcase( pExpr->op==TK_GT );
      testcase( pExpr->op==TK_GE );
      /* The y.pTab=0 assignment in wherecode.c always happens after the
      ** impliesNotNullRow() test */
      if( (pLeft->op==TK_COLUMN && ALWAYS(pLeft->y.pTab!=0)
                               && IsVirtual(pLeft->y.pTab))
       || (pRight->op==TK_COLUMN && ALWAYS(pRight->y.pTab!=0)
                               && IsVirtual(pRight->y.pTab))
      ){
        return WRC_Prune;
      }
    }
    default:
      return WRC_Continue;
  }
}

/*
** Return true (non-zero) if expression p can only be true if at least
................................................................................
  /* Get a NULL terminated version of the new table name. */
  zName = sqlite3NameFromToken(db, pName);
  if( !zName ) goto exit_rename_table;

  /* Check that a table or index named 'zName' does not already exist
  ** in database iDb. If so, this is an error.
  */
  if( sqlite3FindTable(db, zName, zDb)
   || sqlite3FindIndex(db, zName, zDb)
   || sqlite3IsShadowTableOf(db, pTab, zName)
  ){
    sqlite3ErrorMsg(pParse, 
        "there is already another table or index with this name: %s", zName);
    goto exit_rename_table;
  }

  /* Make sure it is not a system table being altered, or a reserved name
  ** that the table is being renamed to.
................................................................................
  renameTestSchema(pParse, zDb, iDb==1);

exit_rename_table:
  sqlite3SrcListDelete(db, pSrc);
  sqlite3DbFree(db, zName);
  db->mDbFlags = savedDbFlags;
}

/*
** Write code that will raise an error if the table described by
** zDb and zTab is not empty.
*/
static void sqlite3ErrorIfNotEmpty(
  Parse *pParse,        /* Parsing context */
  const char *zDb,      /* Schema holding the table */
  const char *zTab,     /* Table to check for empty */
  const char *zErr      /* Error message text */
){
  sqlite3NestedParse(pParse,
     "SELECT raise(ABORT,%Q) FROM \"%w\".\"%w\"",
     zErr, zDb, zTab
  );
}

/*
** This function is called after an "ALTER TABLE ... ADD" statement
** has been parsed. Argument pColDef contains the text of the new
** column definition.
**
** The Table structure pParse->pNewTable was extended to include
................................................................................
  ** column must not be NULL.
  */
  if( pCol->colFlags & COLFLAG_PRIMKEY ){
    sqlite3ErrorMsg(pParse, "Cannot add a PRIMARY KEY column");
    return;
  }
  if( pNew->pIndex ){
    sqlite3ErrorMsg(pParse,
         "Cannot add a UNIQUE column");
    return;
  }
  if( (pCol->colFlags & COLFLAG_GENERATED)==0 ){
    /* If the default value for the new column was specified with a 
    ** literal NULL, then set pDflt to 0. This simplifies checking
    ** for an SQL NULL default below.
    */
    assert( pDflt==0 || pDflt->op==TK_SPAN );
    if( pDflt && pDflt->pLeft->op==TK_NULL ){
      pDflt = 0;
    }
    if( (db->flags&SQLITE_ForeignKeys) && pNew->pFKey && pDflt ){
      sqlite3ErrorIfNotEmpty(pParse, zDb, zTab,
          "Cannot add a REFERENCES column with non-NULL default value");

    }
    if( pCol->notNull && !pDflt ){
      sqlite3ErrorIfNotEmpty(pParse, zDb, zTab,
          "Cannot add a NOT NULL column with default value NULL");

    }


    /* Ensure the default expression is something that sqlite3ValueFromExpr()
    ** can handle (i.e. not CURRENT_TIME etc.)
    */
    if( pDflt ){
      sqlite3_value *pVal = 0;
      int rc;
................................................................................
      rc = sqlite3ValueFromExpr(db, pDflt, SQLITE_UTF8, SQLITE_AFF_BLOB, &pVal);
      assert( rc==SQLITE_OK || rc==SQLITE_NOMEM );
      if( rc!=SQLITE_OK ){
        assert( db->mallocFailed == 1 );
        return;
      }
      if( !pVal ){
        sqlite3ErrorIfNotEmpty(pParse, zDb, zTab,
           "Cannot add a column with non-constant default");
      }
      sqlite3ValueFree(pVal);
    }
  }else if( pCol->colFlags & COLFLAG_STORED ){
    sqlite3ErrorIfNotEmpty(pParse, zDb, zTab, "cannot add a STORED column");

  }


  /* Modify the CREATE TABLE statement. */
  zCol = sqlite3DbStrNDup(db, (char*)pColDef->z, pColDef->n);
  if( zCol ){
    char *zEnd = &zCol[pColDef->n-1];
................................................................................
    assert( db->mallocFailed );
    goto exit_begin_add_column;
  }
  memcpy(pNew->aCol, pTab->aCol, sizeof(Column)*pNew->nCol);
  for(i=0; i<pNew->nCol; i++){
    Column *pCol = &pNew->aCol[i];
    pCol->zName = sqlite3DbStrDup(db, pCol->zName);
    pCol->hName = sqlite3StrIHash(pCol->zName);
    pCol->zColl = 0;
    pCol->pDflt = 0;
  }
  pNew->pSchema = db->aDb[iDb].pSchema;
  pNew->addColOffset = pTab->addColOffset;
  pNew->nTabRef = 1;

................................................................................
** with tail recursion in tokenExpr() routine, for a small performance
** improvement.
*/
SQLITE_PRIVATE void *sqlite3RenameTokenMap(Parse *pParse, void *pPtr, Token *pToken){
  RenameToken *pNew;
  assert( pPtr || pParse->db->mallocFailed );
  renameTokenCheckAll(pParse, pPtr);
  if( ALWAYS(pParse->eParseMode!=PARSE_MODE_UNMAP) ){
    pNew = sqlite3DbMallocZero(pParse->db, sizeof(RenameToken));
    if( pNew ){
      pNew->p = pPtr;
      pNew->t = *pToken;
      pNew->pNext = pParse->pRename;
      pParse->pRename = pNew;
    }
................................................................................
      sNC.pParse = pWalker->pParse;
      sqlite3SelectPrep(sNC.pParse, p, &sNC);
      sqlite3WalkSelect(pWalker, p);
      sqlite3RenameExprlistUnmap(pWalker->pParse, pWith->a[i].pCols);
    }
  }
}

/*
** Unmap all tokens in the IdList object passed as the second argument.
*/
static void unmapColumnIdlistNames(
  Parse *pParse,
  IdList *pIdList
){
  if( pIdList ){
    int ii;
    for(ii=0; ii<pIdList->nId; ii++){
      sqlite3RenameTokenRemap(pParse, 0, (void*)pIdList->a[ii].zName);
    }
  }
}

/*
** Walker callback used by sqlite3RenameExprUnmap().
*/
static int renameUnmapSelectCb(Walker *pWalker, Select *p){
  Parse *pParse = pWalker->pParse;
  int i;
................................................................................
    }
  }
  if( ALWAYS(p->pSrc) ){  /* Every Select as a SrcList, even if it is empty */
    SrcList *pSrc = p->pSrc;
    for(i=0; i<pSrc->nSrc; i++){
      sqlite3RenameTokenRemap(pParse, 0, (void*)pSrc->a[i].zName);
      if( sqlite3WalkExpr(pWalker, pSrc->a[i].pOn) ) return WRC_Abort;
      unmapColumnIdlistNames(pParse, pSrc->a[i].pUsing);
    }
  }

  renameWalkWith(pWalker, p);
  return WRC_Continue;
}

................................................................................
      char *zName = pIdList->a[i].zName;
      if( 0==sqlite3_stricmp(zName, zOld) ){
        renameTokenFind(pParse, pCtx, (void*)zName);
      }
    }
  }
}


/*
** Parse the SQL statement zSql using Parse object (*p). The Parse object
** is initialized by this function before it is used.
*/
static int renameParseSql(
  Parse *p,                       /* Memory to use for Parse object */
................................................................................
  };
  int i;
  sqlite3 *db = pParse->db;
  Db *pDb;
  Vdbe *v = sqlite3GetVdbe(pParse);
  int aRoot[ArraySize(aTable)];
  u8 aCreateTbl[ArraySize(aTable)];
#ifdef SQLITE_ENABLE_STAT4
  const int nToOpen = OptimizationEnabled(db,SQLITE_Stat4) ? 2 : 1;
#else
  const int nToOpen = 1;
#endif

  if( v==0 ) return;
  assert( sqlite3BtreeHoldsAllMutexes(db) );
  assert( sqlite3VdbeDb(v)==db );
  pDb = &db->aDb[iDb];

  /* Create new statistic tables if they do not exist, or clear them
  ** if they do already exist.
  */
  for(i=0; i<ArraySize(aTable); i++){
    const char *zTab = aTable[i].zName;
    Table *pStat;
    aCreateTbl[i] = 0;
    if( (pStat = sqlite3FindTable(db, zTab, pDb->zDbSName))==0 ){

      if( i<nToOpen ){
        /* The sqlite_statN table does not exist. Create it. Note that a 
        ** side-effect of the CREATE TABLE statement is to leave the rootpage 
        ** of the new table in register pParse->regRoot. This is important 
        ** because the OpenWrite opcode below will be needing it. */
        sqlite3NestedParse(pParse,
            "CREATE TABLE %Q.%s(%s)", pDb->zDbSName, zTab, aTable[i].zCols
        );
................................................................................
        aCreateTbl[i] = OPFLAG_P2ISREG;
      }
    }else{
      /* The table already exists. If zWhere is not NULL, delete all entries 
      ** associated with the table zWhere. If zWhere is NULL, delete the
      ** entire contents of the table. */
      aRoot[i] = pStat->tnum;

      sqlite3TableLock(pParse, iDb, aRoot[i], 1, zTab);
      if( zWhere ){
        sqlite3NestedParse(pParse,
           "DELETE FROM %Q.%s WHERE %s=%Q",
           pDb->zDbSName, zTab, zWhereType, zWhere
        );
#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
................................................................................
        /* The sqlite_stat[134] table already exists.  Delete all rows. */
        sqlite3VdbeAddOp2(v, OP_Clear, aRoot[i], iDb);
      }
    }
  }

  /* Open the sqlite_stat[134] tables for writing. */
  for(i=0; i<nToOpen; i++){
    assert( i<ArraySize(aTable) );
    sqlite3VdbeAddOp4Int(v, OP_OpenWrite, iStatCur+i, aRoot[i], iDb, 3);
    sqlite3VdbeChangeP5(v, aCreateTbl[i]);
    VdbeComment((v, aTable[i].zName));
  }
}

................................................................................
#endif

/*
** Three SQL functions - stat_init(), stat_push(), and stat_get() -
** share an instance of the following structure to hold their state
** information.
*/
typedef struct StatAccum StatAccum;
typedef struct StatSample StatSample;
struct StatSample {
  tRowcnt *anEq;                  /* sqlite_stat4.nEq */
  tRowcnt *anDLt;                 /* sqlite_stat4.nDLt */
#ifdef SQLITE_ENABLE_STAT4
  tRowcnt *anLt;                  /* sqlite_stat4.nLt */
  union {
    i64 iRowid;                     /* Rowid in main table of the key */
    u8 *aRowid;                     /* Key for WITHOUT ROWID tables */
................................................................................
  } u;
  u32 nRowid;                     /* Sizeof aRowid[] */
  u8 isPSample;                   /* True if a periodic sample */
  int iCol;                       /* If !isPSample, the reason for inclusion */
  u32 iHash;                      /* Tiebreaker hash */
#endif
};                                                    
struct StatAccum {
  sqlite3 *db;              /* Database connection, for malloc() */
  tRowcnt nEst;             /* Estimated number of rows */
  tRowcnt nRow;             /* Number of rows visited so far */

  int nLimit;               /* Analysis row-scan limit */
  int nCol;                 /* Number of columns in index + pk/rowid */
  int nKeyCol;              /* Number of index columns w/o the pk/rowid */
  u8 nSkipAhead;            /* Number of times of skip-ahead */
  StatSample current;       /* Current row as a StatSample */
#ifdef SQLITE_ENABLE_STAT4
  tRowcnt nPSample;         /* How often to do a periodic sample */
  int mxSample;             /* Maximum number of samples to accumulate */

  u32 iPrn;                 /* Pseudo-random number used for sampling */
  StatSample *aBest;        /* Array of nCol best samples */
  int iMin;                 /* Index in a[] of entry with minimum score */
  int nSample;              /* Current number of samples */
  int nMaxEqZero;           /* Max leading 0 in anEq[] for any a[] entry */
  int iGet;                 /* Index of current sample accessed by stat_get() */
  StatSample *a;            /* Array of mxSample StatSample objects */
#endif
};

/* Reclaim memory used by a StatSample
*/
#ifdef SQLITE_ENABLE_STAT4
static void sampleClear(sqlite3 *db, StatSample *p){
  assert( db!=0 );
  if( p->nRowid ){
    sqlite3DbFree(db, p->u.aRowid);
    p->nRowid = 0;
  }
}
#endif

/* Initialize the BLOB value of a ROWID
*/
#ifdef SQLITE_ENABLE_STAT4
static void sampleSetRowid(sqlite3 *db, StatSample *p, int n, const u8 *pData){
  assert( db!=0 );
  if( p->nRowid ) sqlite3DbFree(db, p->u.aRowid);
  p->u.aRowid = sqlite3DbMallocRawNN(db, n);
  if( p->u.aRowid ){
    p->nRowid = n;
    memcpy(p->u.aRowid, pData, n);
  }else{
................................................................................
  }
}
#endif

/* Initialize the INTEGER value of a ROWID.
*/
#ifdef SQLITE_ENABLE_STAT4
static void sampleSetRowidInt64(sqlite3 *db, StatSample *p, i64 iRowid){
  assert( db!=0 );
  if( p->nRowid ) sqlite3DbFree(db, p->u.aRowid);
  p->nRowid = 0;
  p->u.iRowid = iRowid;
}
#endif


/*
** Copy the contents of object (*pFrom) into (*pTo).
*/
#ifdef SQLITE_ENABLE_STAT4
static void sampleCopy(StatAccum *p, StatSample *pTo, StatSample *pFrom){
  pTo->isPSample = pFrom->isPSample;
  pTo->iCol = pFrom->iCol;
  pTo->iHash = pFrom->iHash;
  memcpy(pTo->anEq, pFrom->anEq, sizeof(tRowcnt)*p->nCol);
  memcpy(pTo->anLt, pFrom->anLt, sizeof(tRowcnt)*p->nCol);
  memcpy(pTo->anDLt, pFrom->anDLt, sizeof(tRowcnt)*p->nCol);
  if( pFrom->nRowid ){
................................................................................
  }else{
    sampleSetRowidInt64(p->db, pTo, pFrom->u.iRowid);
  }
}
#endif

/*
** Reclaim all memory of a StatAccum structure.
*/
static void statAccumDestructor(void *pOld){
  StatAccum *p = (StatAccum*)pOld;
#ifdef SQLITE_ENABLE_STAT4
  if( p->mxSample ){
    int i;
    for(i=0; i<p->nCol; i++) sampleClear(p->db, p->aBest+i);
    for(i=0; i<p->mxSample; i++) sampleClear(p->db, p->a+i);
    sampleClear(p->db, &p->current);
  }
#endif
  sqlite3DbFree(p->db, p);
}

/*
** Implementation of the stat_init(N,K,C,L) SQL function. The four parameters
** are:
**     N:    The number of columns in the index including the rowid/pk (note 1)
**     K:    The number of columns in the index excluding the rowid/pk.
**     C:    Estimated number of rows in the index
**     L:    A limit on the number of rows to scan, or 0 for no-limit 
**
** Note 1:  In the special case of the covering index that implements a
** WITHOUT ROWID table, N is the number of PRIMARY KEY columns, not the
** total number of columns in the table.
**


** For indexes on ordinary rowid tables, N==K+1.  But for indexes on
** WITHOUT ROWID tables, N=K+P where P is the number of columns in the
** PRIMARY KEY of the table.  The covering index that implements the
** original WITHOUT ROWID table as N==K as a special case.
**
** This routine allocates the StatAccum object in heap memory. The return 
** value is a pointer to the StatAccum object.  The datatype of the
** return value is BLOB, but it is really just a pointer to the StatAccum
** object.
*/
static void statInit(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  StatAccum *p;
  int nCol;                       /* Number of columns in index being sampled */
  int nKeyCol;                    /* Number of key columns */
  int nColUp;                     /* nCol rounded up for alignment */
  int n;                          /* Bytes of space to allocate */
  sqlite3 *db = sqlite3_context_db_handle(context);   /* Database connection */
#ifdef SQLITE_ENABLE_STAT4
  /* Maximum number of samples.  0 if STAT4 data is not collected */
  int mxSample = OptimizationEnabled(db,SQLITE_Stat4) ?SQLITE_STAT4_SAMPLES :0;
#endif

  /* Decode the three function arguments */
  UNUSED_PARAMETER(argc);
  nCol = sqlite3_value_int(argv[0]);
  assert( nCol>0 );
  nColUp = sizeof(tRowcnt)<8 ? (nCol+1)&~1 : nCol;
  nKeyCol = sqlite3_value_int(argv[1]);
  assert( nKeyCol<=nCol );
  assert( nKeyCol>0 );

  /* Allocate the space required for the StatAccum object */
  n = sizeof(*p) 
    + sizeof(tRowcnt)*nColUp                  /* StatAccum.anEq */
    + sizeof(tRowcnt)*nColUp;                 /* StatAccum.anDLt */
#ifdef SQLITE_ENABLE_STAT4
  if( mxSample ){
    n += sizeof(tRowcnt)*nColUp                  /* StatAccum.anLt */
      + sizeof(StatSample)*(nCol+mxSample)       /* StatAccum.aBest[], a[] */
      + sizeof(tRowcnt)*3*nColUp*(nCol+mxSample);
  }
#endif

  db = sqlite3_context_db_handle(context);
  p = sqlite3DbMallocZero(db, n);
  if( p==0 ){
    sqlite3_result_error_nomem(context);
    return;
  }

  p->db = db;
  p->nEst = sqlite3_value_int64(argv[2]);
  p->nRow = 0;
  p->nLimit = sqlite3_value_int64(argv[3]);
  p->nCol = nCol;
  p->nKeyCol = nKeyCol;
  p->nSkipAhead = 0;
  p->current.anDLt = (tRowcnt*)&p[1];
  p->current.anEq = &p->current.anDLt[nColUp];

#ifdef SQLITE_ENABLE_STAT4
  p->mxSample = p->nLimit==0 ? mxSample : 0;
  if( mxSample ){
    u8 *pSpace;                     /* Allocated space not yet assigned */
    int i;                          /* Used to iterate through p->aSample[] */

    p->iGet = -1;

    p->nPSample = (tRowcnt)(p->nEst/(mxSample/3+1) + 1);
    p->current.anLt = &p->current.anEq[nColUp];
    p->iPrn = 0x689e962d*(u32)nCol ^ 0xd0944565*(u32)sqlite3_value_int(argv[2]);
  
    /* Set up the StatAccum.a[] and aBest[] arrays */
    p->a = (struct StatSample*)&p->current.anLt[nColUp];
    p->aBest = &p->a[mxSample];
    pSpace = (u8*)(&p->a[mxSample+nCol]);
    for(i=0; i<(mxSample+nCol); i++){
      p->a[i].anEq = (tRowcnt *)pSpace; pSpace += (sizeof(tRowcnt) * nColUp);
      p->a[i].anLt = (tRowcnt *)pSpace; pSpace += (sizeof(tRowcnt) * nColUp);
      p->a[i].anDLt = (tRowcnt *)pSpace; pSpace += (sizeof(tRowcnt) * nColUp);
    }
................................................................................
  }
#endif

  /* Return a pointer to the allocated object to the caller.  Note that
  ** only the pointer (the 2nd parameter) matters.  The size of the object
  ** (given by the 3rd parameter) is never used and can be any positive
  ** value. */
  sqlite3_result_blob(context, p, sizeof(*p), statAccumDestructor);
}
static const FuncDef statInitFuncdef = {
  4,               /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statInit,        /* xSFunc */
  0,               /* xFinalize */
  0, 0,            /* xValue, xInverse */
  "stat_init",     /* zName */
................................................................................
** In other words, if we assume that the cardinalities of the selected
** column for pNew and pOld are equal, is pNew to be preferred over pOld.
**
** This function assumes that for each argument sample, the contents of
** the anEq[] array from pSample->anEq[pSample->iCol+1] onwards are valid. 
*/
static int sampleIsBetterPost(
  StatAccum *pAccum, 
  StatSample *pNew, 
  StatSample *pOld
){
  int nCol = pAccum->nCol;
  int i;
  assert( pNew->iCol==pOld->iCol );
  for(i=pNew->iCol+1; i<nCol; i++){
    if( pNew->anEq[i]>pOld->anEq[i] ) return 1;
    if( pNew->anEq[i]<pOld->anEq[i] ) return 0;
................................................................................
/*
** Return true if pNew is to be preferred over pOld.
**
** This function assumes that for each argument sample, the contents of
** the anEq[] array from pSample->anEq[pSample->iCol] onwards are valid. 
*/
static int sampleIsBetter(
  StatAccum *pAccum, 
  StatSample *pNew, 
  StatSample *pOld
){
  tRowcnt nEqNew = pNew->anEq[pNew->iCol];
  tRowcnt nEqOld = pOld->anEq[pOld->iCol];

  assert( pOld->isPSample==0 && pNew->isPSample==0 );
  assert( IsStat4 || (pNew->iCol==0 && pOld->iCol==0) );

................................................................................
  return 0;
}

/*
** Copy the contents of sample *pNew into the p->a[] array. If necessary,
** remove the least desirable sample from p->a[] to make room.
*/
static void sampleInsert(StatAccum *p, StatSample *pNew, int nEqZero){
  StatSample *pSample = 0;
  int i;

  assert( IsStat4 || nEqZero==0 );

  /* StatAccum.nMaxEqZero is set to the maximum number of leading 0
  ** values in the anEq[] array of any sample in StatAccum.a[]. In
  ** other words, if nMaxEqZero is n, then it is guaranteed that there
  ** are no samples with StatSample.anEq[m]==0 for (m>=n). */
  if( nEqZero>p->nMaxEqZero ){
    p->nMaxEqZero = nEqZero;
  }
  if( pNew->isPSample==0 ){
    StatSample *pUpgrade = 0;
    assert( pNew->anEq[pNew->iCol]>0 );

    /* This sample is being added because the prefix that ends in column 
    ** iCol occurs many times in the table. However, if we have already
    ** added a sample that shares this prefix, there is no need to add
    ** this one. Instead, upgrade the priority of the highest priority
    ** existing sample that shares this prefix.  */
    for(i=p->nSample-1; i>=0; i--){
      StatSample *pOld = &p->a[i];
      if( pOld->anEq[pNew->iCol]==0 ){
        if( pOld->isPSample ) return;
        assert( pOld->iCol>pNew->iCol );
        assert( sampleIsBetter(p, pNew, pOld) );
        if( pUpgrade==0 || sampleIsBetter(p, pOld, pUpgrade) ){
          pUpgrade = pOld;
        }
................................................................................
      pUpgrade->anEq[pUpgrade->iCol] = pNew->anEq[pUpgrade->iCol];
      goto find_new_min;
    }
  }

  /* If necessary, remove sample iMin to make room for the new sample. */
  if( p->nSample>=p->mxSample ){
    StatSample *pMin = &p->a[p->iMin];
    tRowcnt *anEq = pMin->anEq;
    tRowcnt *anLt = pMin->anLt;
    tRowcnt *anDLt = pMin->anDLt;
    sampleClear(p->db, pMin);
    memmove(pMin, &pMin[1], sizeof(p->a[0])*(p->nSample-p->iMin-1));
    pSample = &p->a[p->nSample-1];
    pSample->nRowid = 0;
................................................................................
    }
    assert( iMin>=0 );
    p->iMin = iMin;
  }
}
#endif /* SQLITE_ENABLE_STAT4 */

#ifdef SQLITE_ENABLE_STAT4
/*
** Field iChng of the index being scanned has changed. So at this point
** p->current contains a sample that reflects the previous row of the
** index. The value of anEq[iChng] and subsequent anEq[] elements are
** correct at this point.
*/
static void samplePushPrevious(StatAccum *p, int iChng){

  int i;

  /* Check if any samples from the aBest[] array should be pushed
  ** into IndexSample.a[] at this point.  */
  for(i=(p->nCol-2); i>=iChng; i--){
    StatSample *pBest = &p->aBest[i];
    pBest->anEq[i] = p->current.anEq[i];
    if( p->nSample<p->mxSample || sampleIsBetter(p, pBest, &p->a[p->iMin]) ){
      sampleInsert(p, pBest, i);
    }
  }

  /* Check that no sample contains an anEq[] entry with an index of
................................................................................
      int j;
      for(j=iChng; j<p->nCol; j++){
        if( p->a[i].anEq[j]==0 ) p->a[i].anEq[j] = p->current.anEq[j];
      }
    }
    p->nMaxEqZero = iChng;
  }

}
#endif /* SQLITE_ENABLE_STAT4 */





/*
** Implementation of the stat_push SQL function:  stat_push(P,C,R)
** Arguments:
**
**    P     Pointer to the StatAccum object created by stat_init()
**    C     Index of left-most column to differ from previous row
**    R     Rowid for the current row.  Might be a key record for
**          WITHOUT ROWID tables.
**
** The purpose of this routine is to collect statistical data and/or
** samples from the index being analyzed into the StatAccum object.
** The stat_get() SQL function will be used afterwards to
** retrieve the information gathered.
**
** This SQL function usually returns NULL, but might return an integer
** if it wants the byte-code to do special processing.
**
** The R parameter is only used for STAT4
*/
static void statPush(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  int i;

  /* The three function arguments */
  StatAccum *p = (StatAccum*)sqlite3_value_blob(argv[0]);
  int iChng = sqlite3_value_int(argv[1]);

  UNUSED_PARAMETER( argc );
  UNUSED_PARAMETER( context );
  assert( p->nCol>0 );
  assert( iChng<p->nCol );

  if( p->nRow==0 ){
    /* This is the first call to this function. Do initialization. */
    for(i=0; i<p->nCol; i++) p->current.anEq[i] = 1;
  }else{
    /* Second and subsequent calls get processed here */
#ifdef SQLITE_ENABLE_STAT4
    if( p->mxSample ) samplePushPrevious(p, iChng);
#endif

    /* Update anDLt[], anLt[] and anEq[] to reflect the values that apply
    ** to the current row of the index. */
    for(i=0; i<iChng; i++){
      p->current.anEq[i]++;
    }
    for(i=iChng; i<p->nCol; i++){
      p->current.anDLt[i]++;
#ifdef SQLITE_ENABLE_STAT4
      if( p->mxSample ) p->current.anLt[i] += p->current.anEq[i];
#endif
      p->current.anEq[i] = 1;
    }
  }

  p->nRow++;
#ifdef SQLITE_ENABLE_STAT4
  if( p->mxSample ){
    tRowcnt nLt;
    if( sqlite3_value_type(argv[2])==SQLITE_INTEGER ){
      sampleSetRowidInt64(p->db, &p->current, sqlite3_value_int64(argv[2]));
    }else{
      sampleSetRowid(p->db, &p->current, sqlite3_value_bytes(argv[2]),
                                         sqlite3_value_blob(argv[2]));
    }
    p->current.iHash = p->iPrn = p->iPrn*1103515245 + 12345;




    nLt = p->current.anLt[p->nCol-1];

    /* Check if this is to be a periodic sample. If so, add it. */
    if( (nLt/p->nPSample)!=(nLt+1)/p->nPSample ){
      p->current.isPSample = 1;
      p->current.iCol = 0;
      sampleInsert(p, &p->current, p->nCol-1);
      p->current.isPSample = 0;
    }
................................................................................
    /* Update the aBest[] array. */
    for(i=0; i<(p->nCol-1); i++){
      p->current.iCol = i;
      if( i>=iChng || sampleIsBetterPost(p, &p->current, &p->aBest[i]) ){
        sampleCopy(p, &p->aBest[i], &p->current);
      }
    }
  }else
#endif
  if( p->nLimit && p->nRow>(tRowcnt)p->nLimit*(p->nSkipAhead+1) ){
    p->nSkipAhead++;
    sqlite3_result_int(context, p->current.anDLt[0]>0);
  }
}

static const FuncDef statPushFuncdef = {
  2+IsStat4,       /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statPush,        /* xSFunc */
  0,               /* xFinalize */
................................................................................
#define STAT_GET_NEQ   2          /* "neq" column of stat[34] entry */
#define STAT_GET_NLT   3          /* "nlt" column of stat[34] entry */
#define STAT_GET_NDLT  4          /* "ndlt" column of stat[34] entry */

/*
** Implementation of the stat_get(P,J) SQL function.  This routine is
** used to query statistical information that has been gathered into
** the StatAccum object by prior calls to stat_push().  The P parameter
** has type BLOB but it is really just a pointer to the StatAccum object.
** The content to returned is determined by the parameter J
** which is one of the STAT_GET_xxxx values defined above.
**
** The stat_get(P,J) function is not available to generic SQL.  It is
** inserted as part of a manually constructed bytecode program.  (See
** the callStatGet() routine below.)  It is guaranteed that the P
** parameter will always be a pointer to a StatAccum object, never a
** NULL.
**
** If STAT4 is not enabled, then J is always
** STAT_GET_STAT1 and is hence omitted and this routine becomes
** a one-parameter function, stat_get(P), that always returns the
** stat1 table entry information.
*/
static void statGet(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  StatAccum *p = (StatAccum*)sqlite3_value_blob(argv[0]);
#ifdef SQLITE_ENABLE_STAT4
  /* STAT4 has a parameter on this routine. */
  int eCall = sqlite3_value_int(argv[1]);
  assert( argc==2 );
  assert( eCall==STAT_GET_STAT1 || eCall==STAT_GET_NEQ 
       || eCall==STAT_GET_ROWID || eCall==STAT_GET_NLT
       || eCall==STAT_GET_NDLT 
  );
  assert( eCall==STAT_GET_STAT1 || p->mxSample );
  if( eCall==STAT_GET_STAT1 )
#else
  assert( argc==1 );
#endif
  {
    /* Return the value to store in the "stat" column of the sqlite_stat1
    ** table for this index.
    **
    ** The value is a string composed of a list of integers describing 
    ** the index. The first integer in the list is the total number of 
    ** entries in the index. There is one additional integer in the list 
    ** for each indexed column. This additional integer is an estimate of
    ** the number of rows matched by a equality query on the index using
    ** a key with the corresponding number of fields. In other words,
    ** if the index is on columns (a,b) and the sqlite_stat1 value is 
    ** "100 10 2", then SQLite estimates that:
    **
    **   * the index contains 100 rows,
    **   * "WHERE a=?" matches 10 rows, and
    **   * "WHERE a=? AND b=?" matches 2 rows.
................................................................................

    char *zRet = sqlite3MallocZero( (p->nKeyCol+1)*25 );
    if( zRet==0 ){
      sqlite3_result_error_nomem(context);
      return;
    }

    sqlite3_snprintf(24, zRet, "%llu", 
        p->nSkipAhead ? (u64)p->nEst : (u64)p->nRow);
    z = zRet + sqlite3Strlen30(zRet);
    for(i=0; i<p->nKeyCol; i++){
      u64 nDistinct = p->current.anDLt[i] + 1;
      u64 iVal = (p->nRow + nDistinct - 1) / nDistinct;
      sqlite3_snprintf(24, z, " %llu", iVal);
      z += sqlite3Strlen30(z);
      assert( p->current.anEq[i] );
................................................................................
#ifdef SQLITE_ENABLE_STAT4
  else if( eCall==STAT_GET_ROWID ){
    if( p->iGet<0 ){
      samplePushPrevious(p, 0);
      p->iGet = 0;
    }
    if( p->iGet<p->nSample ){
      StatSample *pS = p->a + p->iGet;
      if( pS->nRowid==0 ){
        sqlite3_result_int64(context, pS->u.iRowid);
      }else{
        sqlite3_result_blob(context, pS->u.aRowid, pS->nRowid,
                            SQLITE_TRANSIENT);
      }
    }
................................................................................
  statGet,         /* xSFunc */
  0,               /* xFinalize */
  0, 0,            /* xValue, xInverse */
  "stat_get",      /* zName */
  {0}
};

static void callStatGet(Parse *pParse, int regStat, int iParam, int regOut){
#ifdef SQLITE_ENABLE_STAT4
  sqlite3VdbeAddOp2(pParse->pVdbe, OP_Integer, iParam, regStat+1);
#elif SQLITE_DEBUG
  assert( iParam==STAT_GET_STAT1 );
#else
  UNUSED_PARAMETER( iParam );
#endif
  assert( regOut!=regStat && regOut!=regStat+1 );
  sqlite3VdbeAddFunctionCall(pParse, 0, regStat, regOut, 1+IsStat4,
                             &statGetFuncdef, 0);
}

/*
** Generate code to do an analysis of all indices associated with
** a single table.
*/
................................................................................
  int iTabCur;                 /* Table cursor */
  Vdbe *v;                     /* The virtual machine being built up */
  int i;                       /* Loop counter */
  int jZeroRows = -1;          /* Jump from here if number of rows is zero */
  int iDb;                     /* Index of database containing pTab */
  u8 needTableCnt = 1;         /* True to count the table */
  int regNewRowid = iMem++;    /* Rowid for the inserted record */
  int regStat = iMem++;        /* Register to hold StatAccum object */
  int regChng = iMem++;        /* Index of changed index field */

  int regRowid = iMem++;       /* Rowid argument passed to stat_push() */

  int regTemp = iMem++;        /* Temporary use register */
  int regTemp2 = iMem++;       /* Second temporary use register */
  int regTabname = iMem++;     /* Register containing table name */
  int regIdxname = iMem++;     /* Register containing index name */
  int regStat1 = iMem++;       /* Value for the stat column of sqlite_stat1 */
  int regPrev = iMem;          /* MUST BE LAST (see below) */
#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
  Table *pStat1 = 0; 
#endif
................................................................................
    VdbeComment((v, "%s", pIdx->zName));

    /* Invoke the stat_init() function. The arguments are:
    ** 
    **    (1) the number of columns in the index including the rowid
    **        (or for a WITHOUT ROWID table, the number of PK columns),
    **    (2) the number of columns in the key without the rowid/pk
    **    (3) estimated number of rows in the index,



    */
    sqlite3VdbeAddOp2(v, OP_Integer, nCol, regStat+1);
    assert( regRowid==regStat+2 );
    sqlite3VdbeAddOp2(v, OP_Integer, pIdx->nKeyCol, regRowid);
#ifdef SQLITE_ENABLE_STAT4
    if( OptimizationEnabled(db, SQLITE_Stat4) ){
      sqlite3VdbeAddOp2(v, OP_Count, iIdxCur, regTemp);
      addrRewind = sqlite3VdbeAddOp1(v, OP_Rewind, iIdxCur);
      VdbeCoverage(v);
    }else
#endif
    {
      addrRewind = sqlite3VdbeAddOp1(v, OP_Rewind, iIdxCur);
      VdbeCoverage(v);
      sqlite3VdbeAddOp3(v, OP_Count, iIdxCur, regTemp, 1);
    }
    assert( regTemp2==regStat+4 );
    sqlite3VdbeAddOp2(v, OP_Integer, db->nAnalysisLimit, regTemp2);

    sqlite3VdbeAddFunctionCall(pParse, 0, regStat+1, regStat, 4,
                               &statInitFuncdef, 0);

    /* Implementation of the following:
    **
    **   Rewind csr
    **   if eof(csr) goto end_of_scan;
    **   regChng = 0
    **   goto next_push_0;
    **
    */


    sqlite3VdbeAddOp2(v, OP_Integer, 0, regChng);
    addrNextRow = sqlite3VdbeCurrentAddr(v);

    if( nColTest>0 ){
      int endDistinctTest = sqlite3VdbeMakeLabel(pParse);
      int *aGotoChng;               /* Array of jump instruction addresses */
      aGotoChng = sqlite3DbMallocRawNN(db, sizeof(int)*nColTest);
................................................................................
        sqlite3VdbeAddOp2(v, OP_NotNull, regPrev, endDistinctTest);
        VdbeCoverage(v);
      }
      for(i=0; i<nColTest; i++){
        char *pColl = (char*)sqlite3LocateCollSeq(pParse, pIdx->azColl[i]);
        sqlite3VdbeAddOp2(v, OP_Integer, i, regChng);
        sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, i, regTemp);
        VdbeComment((v, "%s.column(%d)", pIdx->zName, i));
        aGotoChng[i] = 
        sqlite3VdbeAddOp4(v, OP_Ne, regTemp, 0, regPrev+i, pColl, P4_COLLSEQ);
        sqlite3VdbeChangeP5(v, SQLITE_NULLEQ);
        VdbeCoverage(v);
      }
      sqlite3VdbeAddOp2(v, OP_Integer, nColTest, regChng);
      sqlite3VdbeGoto(v, endDistinctTest);
................................................................................
      **   regPrev(1) = idx(1)
      **  ...
      */
      sqlite3VdbeJumpHere(v, addrNextRow-1);
      for(i=0; i<nColTest; i++){
        sqlite3VdbeJumpHere(v, aGotoChng[i]);
        sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, i, regPrev+i);
        VdbeComment((v, "%s.column(%d)", pIdx->zName, i));
      }
      sqlite3VdbeResolveLabel(v, endDistinctTest);
      sqlite3DbFree(db, aGotoChng);
    }
  
    /*
    **  chng_addr_N:
    **   regRowid = idx(rowid)            // STAT4 only
    **   stat_push(P, regChng, regRowid)  // 3rd parameter STAT4 only
    **   Next csr
    **   if !eof(csr) goto next_row;
    */
#ifdef SQLITE_ENABLE_STAT4
    if( OptimizationEnabled(db, SQLITE_Stat4) ){
      assert( regRowid==(regStat+2) );
      if( HasRowid(pTab) ){
        sqlite3VdbeAddOp2(v, OP_IdxRowid, iIdxCur, regRowid);
      }else{
        Index *pPk = sqlite3PrimaryKeyIndex(pIdx->pTable);
        int j, k, regKey;
        regKey = sqlite3GetTempRange(pParse, pPk->nKeyCol);
        for(j=0; j<pPk->nKeyCol; j++){
          k = sqlite3TableColumnToIndex(pIdx, pPk->aiColumn[j]);
          assert( k>=0 && k<pIdx->nColumn );
          sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, k, regKey+j);

          VdbeComment((v, "%s.column(%d)", pIdx->zName, i));
        }
        sqlite3VdbeAddOp3(v, OP_MakeRecord, regKey, pPk->nKeyCol, regRowid);
        sqlite3ReleaseTempRange(pParse, regKey, pPk->nKeyCol);
      }
    }
#endif
    assert( regChng==(regStat+1) );
    {
      sqlite3VdbeAddFunctionCall(pParse, 1, regStat, regTemp, 2+IsStat4,
                                 &statPushFuncdef, 0);
      if( db->nAnalysisLimit ){
        int j1, j2, j3;
        j1 = sqlite3VdbeAddOp1(v, OP_IsNull, regTemp); VdbeCoverage(v);
        j2 = sqlite3VdbeAddOp1(v, OP_If, regTemp); VdbeCoverage(v);
        j3 = sqlite3VdbeAddOp4Int(v, OP_SeekGT, iIdxCur, 0, regPrev, 1);
        VdbeCoverage(v);
        sqlite3VdbeJumpHere(v, j1);
        sqlite3VdbeAddOp2(v, OP_Next, iIdxCur, addrNextRow); VdbeCoverage(v);
        sqlite3VdbeJumpHere(v, j2);
        sqlite3VdbeJumpHere(v, j3);
      }else{
        sqlite3VdbeAddOp2(v, OP_Next, iIdxCur, addrNextRow); VdbeCoverage(v);
      }
    }

    /* Add the entry to the stat1 table. */
    callStatGet(pParse, regStat, STAT_GET_STAT1, regStat1);
    assert( "BBB"[0]==SQLITE_AFF_TEXT );
    sqlite3VdbeAddOp4(v, OP_MakeRecord, regTabname, 3, regTemp, "BBB", 0);
    sqlite3VdbeAddOp2(v, OP_NewRowid, iStatCur, regNewRowid);
    sqlite3VdbeAddOp3(v, OP_Insert, iStatCur, regTemp, regNewRowid);
#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
    sqlite3VdbeChangeP4(v, -1, (char*)pStat1, P4_TABLE);
#endif
    sqlite3VdbeChangeP5(v, OPFLAG_APPEND);

    /* Add the entries to the stat4 table. */
#ifdef SQLITE_ENABLE_STAT4
    if( OptimizationEnabled(db, SQLITE_Stat4) && db->nAnalysisLimit==0 ){
      int regEq = regStat1;
      int regLt = regStat1+1;
      int regDLt = regStat1+2;
      int regSample = regStat1+3;
      int regCol = regStat1+4;
      int regSampleRowid = regCol + nCol;
      int addrNext;
      int addrIsNull;
      u8 seekOp = HasRowid(pTab) ? OP_NotExists : OP_NotFound;

      pParse->nMem = MAX(pParse->nMem, regCol+nCol);

      addrNext = sqlite3VdbeCurrentAddr(v);
      callStatGet(pParse, regStat, STAT_GET_ROWID, regSampleRowid);
      addrIsNull = sqlite3VdbeAddOp1(v, OP_IsNull, regSampleRowid);
      VdbeCoverage(v);
      callStatGet(pParse, regStat, STAT_GET_NEQ, regEq);
      callStatGet(pParse, regStat, STAT_GET_NLT, regLt);
      callStatGet(pParse, regStat, STAT_GET_NDLT, regDLt);
      sqlite3VdbeAddOp4Int(v, seekOp, iTabCur, addrNext, regSampleRowid, 0);
      VdbeCoverage(v);
      for(i=0; i<nCol; i++){
        sqlite3ExprCodeLoadIndexColumn(pParse, pIdx, iTabCur, i, regCol+i);
      }
      sqlite3VdbeAddOp3(v, OP_MakeRecord, regCol, nCol, regSample);
      sqlite3VdbeAddOp3(v, OP_MakeRecord, regTabname, 6, regTemp);
................................................................................
      rc = sqlite3ResolveExprNames(pName, pExpr);
    }else{
      pExpr->op = TK_STRING;
    }
  }
  return rc;
}

/*
** Return true if zName points to a name that may be used to refer to
** database iDb attached to handle db.
*/
SQLITE_PRIVATE int sqlite3DbIsNamed(sqlite3 *db, int iDb, const char *zName){
  return (
      sqlite3StrICmp(db->aDb[iDb].zDbSName, zName)==0
   || (iDb==0 && sqlite3StrICmp("main", zName)==0)
  );
}

/*
** An SQL user-function registered to do the work of an ATTACH statement. The
** three arguments to the function come directly from an attach statement:
**
**     ATTACH DATABASE x AS y KEY z
**
................................................................................
    if( db->nDb>=db->aLimit[SQLITE_LIMIT_ATTACHED]+2 ){
      zErrDyn = sqlite3MPrintf(db, "too many attached databases - max %d", 
        db->aLimit[SQLITE_LIMIT_ATTACHED]
      );
      goto attach_error;
    }
    for(i=0; i<db->nDb; i++){
      assert( zName );
      if( sqlite3DbIsNamed(db, i, zName) ){

        zErrDyn = sqlite3MPrintf(db, "database %s is already in use", zName);
        goto attach_error;
      }
    }
  
    /* Allocate the new entry in the db->aDb[] array and initialize the schema
    ** hash tables.
................................................................................
#endif
    sqlite3BtreeLeave(pNew->pBt);
  }
  pNew->safety_level = SQLITE_DEFAULT_SYNCHRONOUS+1;
  if( rc==SQLITE_OK && pNew->zDbSName==0 ){
    rc = SQLITE_NOMEM_BKPT;
  }




































  sqlite3_free_filename( zPath );

  /* If the file was opened successfully, read the schema for the new database.
  ** If this fails, or if opening the file failed, then close the file and 
  ** remove the entry from the db->aDb[] array. i.e. put everything back the
  ** way we found it.
  */
  if( rc==SQLITE_OK ){
................................................................................

  UNUSED_PARAMETER(NotUsed);

  if( zName==0 ) zName = "";
  for(i=0; i<db->nDb; i++){
    pDb = &db->aDb[i];
    if( pDb->pBt==0 ) continue;
    if( sqlite3DbIsNamed(db, i, zName) ) break;
  }

  if( i>=db->nDb ){
    sqlite3_snprintf(sizeof(zErr),zErr, "no such database: %s", zName);
    goto detach_error;
  }
  if( i<2 ){
................................................................................
** checks out, these routines return 0.
*/
SQLITE_PRIVATE int sqlite3FixSrcList(
  DbFixer *pFix,       /* Context of the fixation */
  SrcList *pList       /* The Source list to check and modify */
){
  int i;

  struct SrcList_item *pItem;
  sqlite3 *db = pFix->pParse->db;
  int iDb = sqlite3FindDbName(db, pFix->zDb);

  if( NEVER(pList==0) ) return 0;


  for(i=0, pItem=pList->a; i<pList->nSrc; i++, pItem++){
    if( pFix->bTemp==0 ){

      if( pItem->zDatabase && iDb!=sqlite3FindDbName(db, pItem->zDatabase) ){
        sqlite3ErrorMsg(pFix->pParse,
            "%s %T cannot reference objects in database %s",
            pFix->zType, pFix->pName, pItem->zDatabase);
        return 1;
      }
      sqlite3DbFree(db, pItem->zDatabase);
      pItem->zDatabase = 0;
      pItem->pSchema = pFix->pSchema;
      pItem->fg.fromDDL = 1;
    }
#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_TRIGGER)
    if( sqlite3FixSelect(pFix, pItem->pSelect) ) return 1;
    if( sqlite3FixExpr(pFix, pItem->pOn) ) return 1;
................................................................................
#if SQLITE_USER_AUTHENTICATION
  /* Only the admin user is allowed to know that the sqlite_user table
  ** exists */
  if( db->auth.authLevel<UAUTH_Admin && sqlite3UserAuthTable(zName)!=0 ){
    return 0;
  }
#endif
  if( zDatabase ){
    for(i=0; i<db->nDb; i++){

      if( sqlite3StrICmp(zDatabase, db->aDb[i].zDbSName)==0 ) break;
    }
    if( i>=db->nDb ){
      /* No match against the official names.  But always match "main"
      ** to schema 0 as a legacy fallback. */
      if( sqlite3StrICmp(zDatabase,"main")==0 ){
        i = 0;
      }else{
        return 0;
      }
    }


    p = sqlite3HashFind(&db->aDb[i].pSchema->tblHash, zName);
    if( p==0 && i==1 && sqlite3StrICmp(zName, MASTER_NAME)==0 ){


      /* All temp.sqlite_master to be an alias for sqlite_temp_master */
      p = sqlite3HashFind(&db->aDb[1].pSchema->tblHash, TEMP_MASTER_NAME);
    }
  }else{
    /* Match against TEMP first */
    p = sqlite3HashFind(&db->aDb[1].pSchema->tblHash, zName);
    if( p ) return p;
    /* The main database is second */
    p = sqlite3HashFind(&db->aDb[0].pSchema->tblHash, zName);
    if( p ) return p;
    /* Attached databases are in order of attachment */
    for(i=2; i<db->nDb; i++){
      assert( sqlite3SchemaMutexHeld(db, i, 0) );
      p = sqlite3HashFind(&db->aDb[i].pSchema->tblHash, zName);
      if( p ) break;