Many hyperlinks are disabled.
Use anonymous login
to enable hyperlinks.
Overview
| Comment: | Fix a performance problem in queries that use "ORDER BY rowid DESC" and one or more FTS auxiliary functions. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | vtab-conflict |
| Files: | files | file ages | folders |
| SHA1: |
95e09b20e9aad28f829c8950f3632deb |
| User & Date: | dan 2011-05-04 15:41:18 |
Context
|
2011-05-04
| ||
| 16:30 | Fix a couple of compiler warnings in the FTS code. Closed-Leaf check-in: 1a113359 user: dan tags: vtab-conflict | |
| 15:41 | Fix a performance problem in queries that use "ORDER BY rowid DESC" and one or more FTS auxiliary functions. check-in: 95e09b20 user: dan tags: vtab-conflict | |
| 12:52 | Optimize "ORDER BY rowid/docid DESC/ASC" clauses on FTS tables. check-in: 13395121 user: dan tags: vtab-conflict | |
Changes
Changes to ext/fts3/fts3.c.
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
....
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
|
assert( pCsr->eEvalmode==FTS3_EVAL_NEXT ); assert( pExpr->eType==FTSQUERY_PHRASE && pExpr->pPhrase ); pCsr->eEvalmode = FTS3_EVAL_MATCHINFO; rc = fts3EvalExpr(pCsr, pExpr, paDoclist, pnDoclist, 1); pCsr->eEvalmode = FTS3_EVAL_NEXT; return rc; } /* ** After ExprLoadDoclist() (see above) has been called, this function is ** used to iterate/search through the position lists that make up the doclist ** stored in pExpr->aDoclist. */ char *sqlite3Fts3FindPositions( ................................................................................ int iCol /* Column of requested pos-list */ ){ assert( pExpr->isLoaded ); if( pExpr->aDoclist ){ char *pEnd = &pExpr->aDoclist[pExpr->nDoclist]; char *pCsr; if( pExpr->pCurrent==0 || pCursor->desc ){ pExpr->pCurrent = pExpr->aDoclist; pExpr->iCurrent = 0; pExpr->pCurrent += sqlite3Fts3GetVarint(pExpr->pCurrent,&pExpr->iCurrent); } pCsr = pExpr->pCurrent; assert( pCsr ); while( pCsr<pEnd ){ if( pExpr->iCurrent<iDocid ){ fts3PoslistCopy(0, &pCsr); if( pCsr<pEnd ){ fts3GetDeltaVarint(&pCsr, &pExpr->iCurrent); } pExpr->pCurrent = pCsr; }else{ if( pExpr->iCurrent==iDocid ){ int iThis = 0; if( iCol<0 ){ /* If iCol is negative, return a pointer to the start of the ** position-list (instead of a pointer to the start of a list |
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
|
>
|
|
<
>
>
>
>
>
>
>
>
>
>
|
>
>
|
>
>
>
>
|
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
....
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
|
assert( pCsr->eEvalmode==FTS3_EVAL_NEXT ); assert( pExpr->eType==FTSQUERY_PHRASE && pExpr->pPhrase ); pCsr->eEvalmode = FTS3_EVAL_MATCHINFO; rc = fts3EvalExpr(pCsr, pExpr, paDoclist, pnDoclist, 1); pCsr->eEvalmode = FTS3_EVAL_NEXT; return rc; } /* ** When called, *ppPoslist must point to the byte immediately following the ** end of a position-list. i.e. ( (*ppPoslist)[-1]==POS_END ). This function ** moves *ppPoslist so that it instead points to the first byte of the ** position list. */ static void fts3ReversePoslist(char *pStart, char **ppPoslist){ char *p = &(*ppPoslist)[-3]; char c = p[1]; while( p>=pStart && (*p & 0x80) | c ){ c = *p--; } if( p>pStart ){ p = &p[2]; } while( *p++&0x80 ); *ppPoslist = p; } /* ** After ExprLoadDoclist() (see above) has been called, this function is ** used to iterate/search through the position lists that make up the doclist ** stored in pExpr->aDoclist. */ char *sqlite3Fts3FindPositions( ................................................................................ int iCol /* Column of requested pos-list */ ){ assert( pExpr->isLoaded ); if( pExpr->aDoclist ){ char *pEnd = &pExpr->aDoclist[pExpr->nDoclist]; char *pCsr; if( pExpr->pCurrent==0 ){ if( pCursor->desc==0 ){ pExpr->pCurrent = pExpr->aDoclist; pExpr->iCurrent = 0; fts3GetDeltaVarint(&pExpr->pCurrent, &pExpr->iCurrent); }else{ pCsr = pExpr->aDoclist; while( pCsr<pEnd ){ fts3GetDeltaVarint(&pCsr, &pExpr->iCurrent); fts3PoslistCopy(0, &pCsr); } fts3ReversePoslist(pExpr->aDoclist, &pCsr); pExpr->pCurrent = pCsr; } } pCsr = pExpr->pCurrent; assert( pCsr ); while( (pCursor->desc==0 && pCsr<pEnd) || (pCursor->desc && pCsr>pExpr->aDoclist) ){ if( pCursor->desc==0 && pExpr->iCurrent<iDocid ){ fts3PoslistCopy(0, &pCsr); if( pCsr<pEnd ){ fts3GetDeltaVarint(&pCsr, &pExpr->iCurrent); } pExpr->pCurrent = pCsr; }else if( pCursor->desc && pExpr->iCurrent>iDocid ){ fts3GetReverseDeltaVarint(&pCsr, pExpr->aDoclist, &pExpr->iCurrent); fts3ReversePoslist(pExpr->aDoclist, &pCsr); pExpr->pCurrent = pCsr; }else{ if( pExpr->iCurrent==iDocid ){ int iThis = 0; if( iCol<0 ){ /* If iCol is negative, return a pointer to the start of the ** position-list (instead of a pointer to the start of a list |
Changes to test/fts3sort.test.
54 55 56 57 58 59 60 61 62 63 64 65 66 67 |
3 "SELECT docid, * FROM t1 WHERE t1 MATCH 'a*'"
4 "SELECT docid, quote(matchinfo(t1)) FROM t1 WHERE t1 MATCH 'a*'"
5 "SELECT docid, quote(matchinfo(t1,'pcnxals')) FROM t1 WHERE t1 MATCH 'b*'"
6 "SELECT docid, * FROM t1 WHERE t1 MATCH 'a* b* c*'"
7 "SELECT docid, * FROM t1 WHERE t1 MATCH 'aa OR da'"
8 "SELECT docid, * FROM t1 WHERE t1 MATCH 'nosuchtoken'"
9 "SELECT docid, snippet(t1) FROM t1 WHERE t1 MATCH 'aa OR da'"
} {
unset -nocomplain A B C D
set A_list [list]
set B_list [list]
set C_list [list]
set D_list [list]
|
> |
54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 |
3 "SELECT docid, * FROM t1 WHERE t1 MATCH 'a*'"
4 "SELECT docid, quote(matchinfo(t1)) FROM t1 WHERE t1 MATCH 'a*'"
5 "SELECT docid, quote(matchinfo(t1,'pcnxals')) FROM t1 WHERE t1 MATCH 'b*'"
6 "SELECT docid, * FROM t1 WHERE t1 MATCH 'a* b* c*'"
7 "SELECT docid, * FROM t1 WHERE t1 MATCH 'aa OR da'"
8 "SELECT docid, * FROM t1 WHERE t1 MATCH 'nosuchtoken'"
9 "SELECT docid, snippet(t1) FROM t1 WHERE t1 MATCH 'aa OR da'"
10 "SELECT docid, snippet(t1) FROM t1 WHERE t1 MATCH 'aa OR nosuchtoken'"
} {
unset -nocomplain A B C D
set A_list [list]
set B_list [list]
set C_list [list]
set D_list [list]
|