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149 events for the month beginning 2017-01-01 by user drh

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2017-01-31
21:22
R-TREE optimization: unwrap the coordinate decode loop in rtreeCallbackConstraint(). (check-in: 0bf7b518 user: drh tags: trunk)
19:10
Very small performance improvements and size reductions in sqlite3VdbeExec() and blobSeekToRow(). (check-in: 85dddf2b user: drh tags: trunk)
19:02
Simplifications to blobSeekToRow(). (Closed-Leaf check-in: 495ea824 user: drh tags: micro-optimizations)
16:49
Remove a C99-style comment. Fixes to the kvtest-speed.sh script. (check-in: 91eb6b62 user: drh tags: micro-optimizations)
16:45 Edit [02f6293f278f7b0a|02f6293f]: Move to branch micro-optimizations. (artifact: 2ebb6707 user: drh)
16:43
Remove another unnecessary local variable initialization from sqlite3VdbeExec() (check-in: 2361b03b user: drh tags: micro-optimizations)
16:34
Remove an unnecessary initialization of the pOp variable in sqlite3VdbeExec(). (check-in: 02f6293f user: drh tags: micro-optimizations)
15:29
Add the "stat" command to kvtest.c. Also add the --variance option to the "init" command. Add the tool/kvtest-speed.sh script used for doing performance testing on key/value access patterns. (check-in: b63deed6 user: drh tags: trunk)
15:27
Fix a typo in a comment. (check-in: bd22bf9c user: drh tags: trunk)
12:41
Further minor enhancement and size reduction in sqlite3ExprAssignVarNumber(). (check-in: eacfdcf2 user: drh tags: trunk)
03:52
Performance optimization in sqlite3ExprAssignVarNumber(). (check-in: 5987ca1f user: drh tags: trunk)
2017-01-28
20:46
In the amalgamation, allocate the parser engine object from stack rather than from heap, for improved performance. This only happens in the amalgamation, since otherwise the sqlite3RunParser() routine does not know the object size. (check-in: 4fe879d4 user: drh tags: trunk)
15:26
Updates to the sqlite3_blob documentation. No changes to code. (check-in: 426b440a user: drh tags: trunk)
13:40
In the speed-check.sh script, automatically invoke "fossil test-diff --tk" on the cachegrind output against trunk, if not generating a trunk run. (check-in: aa1ab371 user: drh tags: trunk)
2017-01-27
19:27
Add the sha1.c loadable extension that implements the sha1() and sha1_query() SQL functions. (check-in: 24e77c1c user: drh tags: trunk)
16:39
Merge all recent trunk enhancements into the apple-osx branch. (check-in: 0e14fe1b user: drh tags: apple-osx)
16:24
Merge all recent enhancements from trunk. (check-in: fe86ff54 user: drh tags: est_count_pragma)
13:14
Alternative ICU fix (compare to check-in [50e60cb4]) that avoids casting integers to pointers. (check-in: d9752c8f user: drh tags: trunk)
01:52
In the command-line shell, enhance the ".mode" command so that it restores the default column and row separators for modes "line", "list", "column", and "tcl". (check-in: 58f02e6e user: drh tags: trunk)
01:25
Another micro-optimization in accessPayload(). Slightly smaller and faster. (check-in: c012619b user: drh tags: trunk)
01:13
Performance optimization in accessPayload(). (check-in: ebb1fd98 user: drh tags: trunk)
00:31
Simplify the accessPayload() routine so that it always populates the overflow page cache. In the one case where populating the page cache can lead to problems, simply invalidate the cache as soon as accessPayload() returns. This simplification reduces code size and helps accessPayload() to run a little faster. This backs out the eOp==2 mode of accessPayload() added by check-in [da59198505]. (check-in: 68e7a8c6 user: drh tags: trunk)
2017-01-26
21:30
Remove an unreachable branch in the error handling logic for sqlite3BtreePayloadChecked(). (check-in: 293bf3ed user: drh tags: trunk)
18:00
Improvement to the OP_Permutation opcode to prevent it from using CPU cycles for initialization in prepared statements that do not use that opcode. (check-in: b4a98f65 user: drh tags: trunk)
17:26
Remove the obsolete lastRowid cache from the sqlite3VdbeExec() for a size reduction and performance improvement. (check-in: b4803184 user: drh tags: trunk)
17:11
Performance optimization in sqlite3VdbeCloseStatement(). (check-in: 1e96e5ec user: drh tags: trunk)
16:54
Performance optimization to sqlite3_blob_read(). (check-in: 7459f4b7 user: drh tags: trunk)
16:27
Minor simplification and performance optimization for Direct Overflow Read. (check-in: 3e96d6ef user: drh tags: trunk)
02:26
Make SQLITE_DIRECT_OVERFLOW_READ work for in WAL mode as long as the page being read is not in the the -wal file. (check-in: 9879be18 user: drh tags: trunk)
01:54
Enhancements to the kvtest utility program. Add the --jmode option. Improved output formatting. (check-in: 62a4851c user: drh tags: trunk)
00:58
Modify the ICU extension to use a static initializer, as VC++ complains about a dynamic initialization. Maybe the dynamic structure initialization is a GCC extension. This fixes a problem identified on the SQLite mailing list by Ziemowit Laski. (check-in: 50e60cb4 user: drh tags: trunk)
2017-01-25
20:59 Edit [4801bd59a01dcc11|4801bd59]: Edit check-in comment. (artifact: 40110994 user: drh)
20:55
Trim NULL values off the end of records when the SQLITE_ENABLE_NULL_TRIM compile-time option is used. Increase the size of the P5 operand to 16 bits. Fix a problem with short records in the sessions extension. (check-in: 4801bd59 user: drh tags: trunk)
19:04 Fixed ticket [e6e962d6]: sqlite3_blob_reopen() misbehavior on ALTER-ed table plus 5 other changes (artifact: 3850384c user: drh)
14:58
Experimental enhancement to automatically trim NULL values from the end of records, for a reduced disk footprint. This change also involves increasing the P5 operand from 8 to 16 bits. (check-in: 118ded40 user: drh tags: trim-nulls)
14:38
Ensure that sqlite3_blob_reopen() correctly handles short rows. Fix for ticket [e6e962d6b0f06f46e]. (check-in: 8cd1a445 user: drh tags: trunk)
13:54
Fix SQLITEINT_H macro usage in two extensions. (check-in: 0803390c user: drh tags: trunk)
04:41
Ensure that sqlite3_blob_reopen() correctly handles short rows. Proposed fix for ticket [e6e962d6b0f06f46e]. Further testing needed. (Closed-Leaf check-in: 57d8dad3 user: drh tags: blob_reopen-fix)
04:28 New ticket [e6e962d6] sqlite3_blob_reopen() misbehavior on ALTER-ed table. (artifact: a6d71ce7 user: drh)
2017-01-23
19:11
Document the --mmap option in the --help screen for kvtest. Enhance kvtest so that numeric arguments can have suffixes like "K" or "M". Add kvtest to the unix makefiles. (check-in: 175bda87 user: drh tags: trunk)
18:40
Add the --mmap option to the kvtest utility program. (check-in: 4948f7e6 user: drh tags: trunk)
16:56
Optimization: Try to avoid unnecessary btree searching when repositioning a cursor to the next row. (check-in: ee793d30 user: drh tags: trunk)
2017-01-22
16:34
Fix an uninitialized variable in the command-line shell. (check-in: 06b8001a user: drh tags: trunk)
00:11
Fix an initialized variable in kvtest. (check-in: ed62c5a6 user: drh tags: trunk)
2017-01-21
21:47
A better implementation of the moveto-neighbor optimization that checks for nearby rows on adjacent pages. (Closed-Leaf check-in: 2c4ecb85 user: drh tags: btree-moveto-neighbor)
21:47 Edit [8e5cfb2039126da7|8e5cfb20]: Move to branch btree-moveto-neighbor. (artifact: 3be615f5 user: drh)
16:54
B-tree optimization: When seeking on a rowid table that has already been positioned, check to see if the new row happens to be the next row on the same leaf page. That is a reasonably common case, and if it is true it avoids a full binary search. (check-in: 8e5cfb20 user: drh tags: btree-moveto-neighbor)
16:27
Change sqlite3_blob_reopen() to call sqlite3VdbeExec() directly rather than going through sqlite3_step(). Performance enhancement. (check-in: 347df3c1 user: drh tags: trunk)
15:55
In the kvtest.c test utility, reuse the buffer into which blobs are read, rather than reallocating it for each row. This is a closer match to how other test programs work, and thus provides a better comparison. (check-in: 0d1ad13a user: drh tags: trunk)
15:30
A proof-of-concept for running sqlite3_blob_open() without using OP_Column when operating on a pure key/value table. This demo does not include any corrupt database checking. Uses about 3% fewer CPU cycles on a key/value performance test. (Leaf check-in: 4cda3b30 user: drh tags: kv-access-opt-demo)
14:11
Remove an unnecessary sqlite3_bind_int64() call from sqlite3_blob_open(). Also other minor refactoring of the sqlite3_blob implementation. (check-in: 9d197a53 user: drh tags: trunk)
2017-01-20
20:43
Minor performance optimization and size reduction to the accessPayload() routine in btree.c. (check-in: 264e5c10 user: drh tags: trunk)
16:09
Get the "--testset rtree" option working on speedtest1. Add the --rtree, --lookaside, and --clang options to the speed-check.sh script. (check-in: 87b640c8 user: drh tags: trunk)
00:40
Minor performance optimizations to sqlite3_blob_open() and sqlite3_blob_reopen(). (check-in: 52a61967 user: drh tags: trunk)
2017-01-19
21:20
If compiled with SQLITE_INLINE_MEMCPY, all memcpy() calls are replaced with in-line code. With that change, cachegrind shows which memcpy() calls are taking the most time. This is a performance-measurement hack only and is not for production use. (check-in: 9ed38521 user: drh tags: trunk)
12:07
Add a prototype of the sqlite3_kv_reset() interface. (Leaf check-in: 088c5903 user: drh tags: sqlite3_kv)
2017-01-18
19:54
Begin fleshing out the key/value accessor implementation. This is an incremental check-in. (check-in: 02d60e19 user: drh tags: sqlite3_kv)
17:20
Baseline interface definition for the experimental sqlite3_kv accessor object. (check-in: a435841e user: drh tags: sqlite3_kv)
2017-01-17
00:10
Disable intrinsic functions for Windows using Clang, due to reports of linkage errors. This causes a 0.6% performance reduction. We will want to revisit this change in the future. (check-in: 7fd560c6 user: drh tags: trunk)
2017-01-16
18:10 Fixed ticket [7ffd1ca1]: Incorrect affinity when using automatic indexes plus 5 other changes (artifact: d60e4194 user: drh)
18:10
Back out check-in [0b3174e0b1364c] and replace it with a better fix for \ticket [91e2e8ba6ff2e2] - a fix that does not cause the problem identified by ticket [7ffd1ca1d2ad4ec]. Add new test cases for both tickets. (check-in: 9b64af7b user: drh tags: trunk)
16:43
Back out check-in [0b3174e0b1364c] and replace it with a better fix for ticket [91e2e8ba6ff2e2] - a fix that does not cause the problem identified by ticket [7ffd1ca1d2ad4ec]. (Closed-Leaf check-in: 06136652 user: drh tags: automatic-index-affinity)
16:01
Add test cases for tickets [91e2e8ba6ff2e2] and [7ffd1ca1d2ad4ec]. (check-in: 9d0dfe0b user: drh tags: automatic-index-affinity)
15:10 New ticket [7ffd1ca1] Incorrect affinity when using automatic indexes. (artifact: 9ce8b972 user: drh)
11:54
An example showing how to improve performance of sqlite3VdbeSerialPut() using the GCC intrinsic function __builtin_bswap64(). (Leaf check-in: e42ed9b4 user: drh tags: builtin-bswap64)
2017-01-13
12:53
Fix the build for SQLITE_ENABLE_MEMORY_MANAGEMENT. (check-in: 8c85b8fd user: drh tags: trunk)
2017-01-12
19:10
Remove a branch that is probably unreachable, and which adds no value. (check-in: 9acc7238 user: drh tags: trunk)
16:21
Fix harmless compiler warnings in the UPDATE code generator. (check-in: 385db266 user: drh tags: trunk)
16:14
Remove an unnecessary corruption test from the btree balancer. If corruption is present, it will be found harmlessly by later tests. (check-in: bddf3956 user: drh tags: trunk)
15:19
Test case macros to show that the previous check-in is well tested. (Leaf check-in: bd8b977a user: drh tags: extra-testcase-macros)
15:11
Improved detection of cells that extend into the reserved space at the end of the page while adjusting overflow page pointers during autovacuum. (check-in: 8097712c user: drh tags: trunk)
11:52
Remove invalid test case from cursorhints2.test (check-in: 163cc1b2 user: drh tags: trunk)
11:50
Make sure Tcl_AppendResult() always has a NULL-pointer argument at the end. (check-in: c07aef6f user: drh tags: trunk)
2017-01-11
14:21
In the STAT4 computations, ensure that the aAvgEq values do not go negative. (check-in: 4f83f680 user: drh tags: branch-3.8.9)
14:15
In the STAT4 computations, ensure that the aAvgEq values do not go negative. (check-in: f58f75b5 user: drh tags: trunk)
2017-01-10
17:46 Fixed ticket [25e335f8]: Incorrect result when ON clause refers to table to the right plus 4 other changes (artifact: 70ac38b2 user: drh)
17:33
Throw an error if the ON clause of a LEFT JOIN references tables to the right of the ON clause. Fix for ticket [25e335f802dd]. (check-in: c92ecff2 user: drh tags: trunk)
17:19 Ticket [25e335f8] Incorrect result when ON clause refers to table to the right status still Open with 6 other changes (artifact: b5f4cd32 user: drh) ... 1 similar event omitted.
16:09
Avoid unnecessary calls to the xRoundup() method of the memory allocator when the soft heap limit is not set. (check-in: 4209b89e user: drh tags: trunk)
15:08
Fix a potential assertion fault discovered by OSS-Fuzz. (check-in: 71c03b59 user: drh tags: trunk)
2017-01-09
20:57
Merge latest changes from trunk, and also move the perf-counter into the inner loop of sqlite3BtreeMovetoUnpacked(). (Leaf check-in: ff9eab95 user: drh tags: vdbe-aux-perf)
19:55
Remove a redundant assignment statement. (check-in: a5fa0965 user: drh tags: trunk)
19:27
Performance optimization and size reduction in the OP_Variable opcode. (check-in: 237aa974 user: drh tags: trunk)
18:21 Edit [8a90f69139f7014e|8a90f691]: Mark "Closed". (artifact: ee29e8a2 user: drh)
18:20
Try to move OP_Concat operations outside the inner loop. This turns out to make things very slightly slower, at least in speedtest1.c. (Closed-Leaf check-in: 8a90f691 user: drh tags: failed-optimization)
15:44
Modify the OP_RowData opcode so that when P3!=0 it is allowed to hold an ephemeral copy of the content. This avoids unnecessary memcpy() operations in the xfer-optimization and VACUUM. (check-in: 6e106acd user: drh tags: trunk)
13:43
Add the SQLITE_UINT64_TYPE compile-time option. (check-in: a5fe03bc user: drh tags: trunk)
2017-01-07
14:47
Improvements to the iIdxNoSeek optimization of sqlite3GenerateRowDelete() so that it is automatically disabled for BEFORE triggers but works in all other cases. (check-in: 3178ec4c user: drh tags: trunk)
14:26
Critical fix to the previous check-in so that it works when there are BEFORE triggers that move the cursor before the OP_Delete has a chance to be applied. (check-in: db2c0960 user: drh tags: trunk)
03:26
Avoid an unnecessary btree seek while deleting an index entry due to a conflict on a REPLACE operation. (check-in: f0495c51 user: drh tags: trunk)
00:56
Avoid duplicate b-tree searches in the duplicate row detector used to implement DISTINCT. (check-in: d577dda0 user: drh tags: trunk)
00:42
This hack illustrates how to use the VDBE_PROFILE mechanism to show which bytecode operators are using resources other than time. In this case, the number of loops through the binary search code in sqlite3BtreeMovetoUnpacked() is measured, for the purpose of helping to identify unnecessary btree searches. (check-in: 746b1836 user: drh tags: vdbe-aux-perf)
2017-01-06
17:01
Merge the changes for version 3.16.2. (check-in: c59c8880 user: drh tags: apple-osx)
16:32
Version 3.16.2 (Leaf check-in: a65a6289 user: drh tags: release, branch-3.16, version-3.16.2)
01:09
Clarify the documentation on sqlite3_column_count(). (check-in: 9ea0badd user: drh tags: trunk)
2017-01-05
17:38 Fixed ticket [190c2507]: Assertion fault on a query against a view plus 5 other changes (artifact: db3c58de user: drh)
17:27
Version 3.16.2 second release candidate (check-in: 285c5a54 user: drh tags: branch-3.16)
16:34 New ticket [190c2507] Assertion fault on a query against a view. (artifact: 5c889138 user: drh)
15:50
Version 3.16.2 release candidate (check-in: 9d8ffe13 user: drh tags: branch-3.16)
14:23 Fixed ticket [30027b61]: DELETE trigger on WITHOUT ROWID table not fired for REPLACE op plus 4 other changes (artifact: 8389ee53 user: drh)
14:05
Increase the version number to 3.16.2 (check-in: 9592cbcf user: drh tags: branch-3.16)
13:56
Fix problems in trigger and foreign key handling when doing REPLACE on a WITHOUT ROWID table that has no secondary indexes. Fix for ticket [30027b613b4]. (check-in: 8a788594 user: drh tags: branch-3.16)
13:52
Ensure that the sqlite3_value_text() interface returns a buffer that is long enough to hold the complete string plus the zero terminator even when the input is a zeroblob. Fix for a problem detected by OSS-Fuzz. (check-in: ca185808 user: drh tags: branch-3.16)
13:50 Edit [571f166ea8721e23|571f166e]: Edit check-in comment. (artifact: ad748def user: drh)
13:50
Fix problems in trigger and foreign key handling when doing REPLACE on a WITHOUT ROWID table that has no secondary indexes. Fix for ticket [30027b613b4]. (check-in: 571f166e user: drh tags: trunk)
07:58
Ensure that the sqlite3_value_text() interface returns a buffer that is long enough to hold the complete string plus the zero terminator even when the input is a zeroblob. Fix for a problem detected by OSS-Fuzz. (check-in: 2dc7eeb5 user: drh tags: trunk)
2017-01-04
22:02
Improved the comment on the block of code the provides the performance optimization originally added by check-in [925840cfdb]. The original check-in omitted condition 4, which was the cause of bug [30027b613b]. (check-in: c6506b82 user: drh tags: replace-fix)
21:27 Edit [925840cfdb969a76|925840cf]: Edit check-in comment. (artifact: 2c80a6b1 user: drh)
21:26 Ticket [30027b61] DELETE trigger on WITHOUT ROWID table not fired for REPLACE op status still Open with 6 other changes (artifact: 53472fbe user: drh)
21:06 Edit [71ccb1f4c490fdeb|71ccb1f4]: Edit check-in comment. (artifact: feb906c4 user: drh)
14:53
Adjust filename creation in test_sqllog.c so that it uses leading zeros on counters, so that files appear in order when sorted lexicographically. (check-in: 8d670973 user: drh tags: trunk)
13:09
Performance enhancements in the printf implementation. (check-in: 82e4001b user: drh tags: trunk)
04:18
Factor constant functions out of the inner loop since they are more expensive than the extra OP_Copy needed to move the result into place. (check-in: 80ad317f user: drh tags: trunk)
04:10
Clean up the implementation of constant function factorization. (Closed-Leaf check-in: 2ab997e4 user: drh tags: factor-constant-funcs)
01:07
Attempt to factor out constant functions from the interior of table scans, since functions can often be expensive to compute. (check-in: 62e9270a user: drh tags: factor-constant-funcs)
00:26
Changes to the printf implementation for better performance. (Closed-Leaf check-in: acdb8f6f user: drh tags: printf-optimization)
2017-01-03
21:57
Use compiler intrinsic functions for signed integer math when overflow detection is needed. (check-in: d3ac32a6 user: drh tags: trunk)
21:50
Back out the use of __sync_fetch_and_sub() as it does not appear to work. (Closed-Leaf check-in: 4c2efd42 user: drh tags: gnu-safe-math)
21:03
Fix a typo in a comment. (check-in: ae087123 user: drh tags: gnu-safe-math)
20:20
Merge changes from the 3.16.1 release (check-in: dcbec226 user: drh tags: apple-osx)
20:01
Use the CLANG_VERSION macro to control clang-specific features. (check-in: f8ebeec2 user: drh tags: gnu-safe-math)
18:27
Version 3.16.1 (check-in: 979f0439 user: drh tags: release, version-3.16.1, branch-3.16)
18:05
Use the GCC built-in __sync_fetch_and_sub() to make the sqlite3StatusDown() routine atomic, and thereby avoid some mutexing. (check-in: f69ce75b user: drh tags: gnu-safe-math)
17:33
Make use of the __buildin_OP_overflow() functions from GCC when doing 64-bit signed integer arithmetic. (check-in: 82cbebb8 user: drh tags: gnu-safe-math)
16:03
Bump the version number up to 3.16.1. (check-in: a60b60d6 user: drh tags: branch-3.16)
15:59
Defer size checking on row-value assignments for when the RHS is a SELECT until after the "*" wildcards have been expanded. (check-in: 5c892938 user: drh tags: branch-3.16)
15:57
Fix the row-values in UPDATE statements within TRIGGER problem identified by ticket [8c9458e7]. (check-in: bf984e98 user: drh tags: branch-3.16)
14:45
Add the experimental affinity() SQL function when SQLITE_DEBUG is defined. (check-in: bed0eaa5 user: drh tags: trunk)
14:39
Put the affinity() function implementation inside of #ifdef SQLITE_DEBUG. (Closed-Leaf check-in: f778f58a user: drh tags: affinity-sql-func)
14:30
Merge all the latest changes from trunk. (check-in: c27cd8a8 user: drh tags: affinity-sql-func)
14:23 Edit [14da99d41f7968bf|14da99d4]: Mark "Closed". (artifact: df1bc935 user: drh)
13:45
Defer size checking on row-value assignments for when the RHS is a SELECT until after the "*" wildcards have been expanded. (check-in: 36944be6 user: drh tags: trunk)
13:37 Fixed ticket [8c9458e7]: row-value updates in triggers do not work. plus 5 other changes (artifact: 0395bbea user: drh)
11:59
Fix a typo on a comment. No code changes. (check-in: abc27b60 user: drh tags: trunk)
02:58
Improvements to the way vector assignment size checking is done. Size checks when the RHS is a SELECT are deferred until after "*" wildcards are expanded. (Closed-Leaf check-in: 696219b1 user: drh tags: vector-size-check)
01:24
Fix the row-values in UPDATE statements within TRIGGER problem identified by ticket [8c9458e7]. (check-in: f12ed3ce user: drh tags: trunk)
00:27
Improved assert()s on the sqlite3ExprListDup() logic for TK_SELECT_COLUMN. (Closed-Leaf check-in: 14da99d4 user: drh tags: rowvalue-update-trigger)
2017-01-02
23:43
Test cases for the row-value UPDATE TRIGGER fix. (check-in: b9b96437 user: drh tags: rowvalue-update-trigger)
23:18
Put an ALWAYS() on an unreachable branch in the sqlite3ExprListDup() routine. (check-in: 2caaaab5 user: drh tags: rowvalue-update-trigger)
22:36
Proposed fix for the row-value TRIGGER UPDATE problem described in ticket [8c9458e7]. (check-in: 61a442ea user: drh tags: rowvalue-update-trigger)
21:40 New ticket [8c9458e7] row-value updates in triggers do not work.. (artifact: 2e02cb7e user: drh)
19:10
Increase the version number to 3.17.0 for the next release cycle. (check-in: 16415b5a user: drh tags: trunk)
19:02
Provide the SQLITE_DEFAULT_LOOKASIDE compile-time option and make it's default value be 1200,100 (raised from 512,125 in the latest release). (check-in: 584da48f user: drh tags: trunk)
18:40
Change SQLITE_DEFAULT_PCACHE_INITSZ from 100 to 20, which is experimentally determined to be slightly faster. (check-in: 12d9493c user: drh tags: trunk)
18:19
Avoid unnecessary calls to sqlite3BtreeEnterAll() and sqlite3BtreeLeaveAll() when no btree is using shared-cache. (check-in: cfb31582 user: drh tags: trunk)
12:20
Add the --all option to the wordcount test program. Fix the speedtest1 test program so that it builds on MSVC and so that the --lookaside 0 0 option works. (check-in: cb338f36 user: drh tags: trunk)
11:57
Version 3.16.0 (check-in: 04ac0b75 user: drh tags: trunk, release, version-3.16.0)
2017-01-01
12:44
Detect row-value comparison size mismatches even when the size of one operand is obscured by an unexpanded subquery. (check-in: 2c4d167c user: drh tags: trunk)
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