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100 most recent check-ins

2020-10-22
18:58
Minor tweaks to query planning weights so that when STAT4 is enabled and functioning, a full table scan is more likely to be selected if that seems like the fastest solution. Only do this when STAT4 info is available because an error has a large potential downside. (Leaf check-in: 263293f1 user: drh tags: branch-3.28)
18:50
Minor tweaks to query planning weights so that when STAT4 is enabled and functioning, a full table scan is more likely to be selected if that seems like the fastest solution. Only do this when STAT4 info is available because an error has a large potential downside. (Leaf check-in: 0e7e113d user: drh tags: trunk)
18:16
Test case updates. (Closed-Leaf check-in: 27c681c9 user: drh tags: avoid-bad-indexes)
15:47
Sometimes it makes sense to do a full table scan rather than try to use an index when most of the rows will be selected. This branch is trying to tune the query planner to make that happen more often. (check-in: 0f42099a user: drh tags: avoid-bad-indexes)
2020-10-20
14:40
Fix the sqlite3_hard_heap_limit() so that it works with sqlite3_realloc64() in addition to sqlite3_malloc64(). Improvements to OOM processing and debugging aids in the fuzzcheck utility. (check-in: 602d7369 user: drh tags: trunk)
12:37
Fix an assert() inside of debug-only code that can fail following an OOM. (check-in: 79da254f user: drh tags: trunk)
2020-10-19
20:49
Fix an incorrect table ref-count in the new recursive CTE logic that might result in a reference to freed memory following a syntax error. (check-in: 75a02888 user: drh tags: trunk)
12:35
Enhance recursive common table expressions to support two or more recursive terms. (check-in: 77e64647 user: drh tags: trunk)
01:44
New test cases for recursive CTEs with multiple recursive terms. (Leaf check-in: cd5182bd user: drh tags: cte-enhancement)
01:23
Allow multiple recursive terms in the compound SELECT of a recursive CTE. This facilitates writing a query to find find the connected components of an undirected graph. (check-in: 5481fa8c user: drh tags: cte-enhancement)
2020-10-18
18:35
Fix harmless compiler warnings. (check-in: 7f8802bb user: mistachkin tags: trunk)
2020-10-17
22:13
Fix the SQLITE_DESERIALIZE_FREEONCLOSE flag so that it works as it is documented to work. See forum post ba1dff667a (check-in: d6fac8a1 user: drh tags: trunk)
19:09
Fix an incorrect printf() in debugging logic in where.c. Problem reported by forum post 80a9c47769772207. (check-in: 883da4da user: drh tags: trunk)
2020-10-15
17:59
Minor fixes to the cksumvfs documentation in the header comment of the source file. Enhance speedtest1.c so that it can more easily do performance comparisons of cksumvfs. (check-in: ed3bb818 user: drh tags: trunk)
14:37
The windows VFS accepts query parameter "exclusive=true" to cause it to take a mandatory file lock, preventing other applications from even reading the file. (check-in: 05b573fd user: drh tags: trunk)
2020-10-14
21:31
Enhancements to TclKit batch tool for MSVC. (check-in: 2a8a4552 user: mistachkin tags: trunk)
21:30
Fix typo in a documentation comment. (check-in: 462adc7d user: mistachkin tags: trunk)
15:46
Enhanced documentation for sqlite3_vtab_nochange() to make it clear that it is an optimization and that virtual table implementations should be prepared for it to always return false. (check-in: 3e264361 user: drh tags: trunk)
2020-10-12
18:09
Fix some fts5 problems with signed integer overflow causing segfaults in -ftrapv builds. (check-in: 7e17c2f4 user: dan tags: trunk)
17:57
Improved quoting of the table name argument for the ".import" command of the CLI. See forum post 34591fefbe. (check-in: ce97b56d user: drh tags: trunk)
16:54
Add options --data-only and --nosys to the ".dump" command in the CLI. (check-in: 57123b14 user: drh tags: trunk)
15:27
Fix ALTER TABLE so that it can run even if the schema contains unknown collation sequences. (check-in: bc4bb943 user: dan tags: trunk)
14:56
Add the --nosys option to the .schema command in the CLI. (check-in: b72ee694 user: drh tags: trunk)
14:29
Fix UPDATE FROM statements on virtual tables that are declared WITHOUT ROWID. See forum post 0fee7951eb for more information. (check-in: bcb0bc6a user: dan tags: trunk)
13:24
Fix BEGIN IMMEDIATE and BEGIN EXCLUSIVE so that they work even if one or more of the database files in the connection are read-only. Test cases for this are in TH3. (check-in: 2fa08c39 user: drh tags: trunk)
2020-10-07
11:24
In the CSV extension, use SQLITE_TRANSIENT rather than SQLITE_STATIC on return values that can in fact change. (check-in: 54b54f02 user: drh tags: trunk)
2020-10-06
15:48
More additions and improvements to btree.h documentation (Leaf check-in: a49a7cde user: shearer tags: btree-code-documentation)
2020-10-05
16:41
Allow fts5 trigram tables created with detail=column or detail=none to optimize LIKE and GLOB queries. Allow case-insensitive tables to optimize GLOB as well as LIKE. (check-in: 64782463 user: dan tags: trunk)
2020-10-03
19:16
Do not apply affinities when creating entries for automatic indexes on views. Fix for [95302bdb]. (check-in: df12f097 user: dan tags: trunk)
17:06
Fix a segfault caused by running "column LIKE NULL" against an fts5 table using the trigram tokenizer. Fix for [e33ee62575fc22]. (check-in: 6e72a08d user: dan tags: trunk)
14:36
FTS5 does not handle tokens that contain embedded nul characters. Prevent the trigram tokenizer from returning such tokens. Fix for [2ba5930b2]. (check-in: b1d04874 user: dan tags: trunk)
2020-10-02
15:15
Fix some test code so that testfixture can build with SQLITE_OMIT_WAL defined. (check-in: dd009cd7 user: dan tags: trunk)
13:57
Import further corner-case fixes for the in-scan-vs-index or OP_SeekScan optimization from trunk. (check-in: c144d640 user: drh tags: branch-3.28)
13:48
Additional corner-case fixes for the in-scan-vs-index or OP_SeekScan optimization. (check-in: ad5ab24e user: drh tags: trunk)
12:49
Remove an incorrect assert() from the OP_SeekScan opcode. (check-in: c0400f8c user: drh tags: trunk)
12:42
Fix a faulty assert() statement. Add new test cases. (check-in: 80ecdb3d user: drh tags: trunk)
12:11
For the OP_SeekScan optimization, the OP_IdxGT does not necessarily come right after the OP_SeekGE. So use the P2 operand of OP_SeekScan to point to the first instruction after OP_IdxGT. Problem found by dbsqlfuzz. (check-in: ec37744c user: drh tags: branch-3.28)
11:55
For the OP_SeekScan optimization, the OP_IdxGT does not necessarily come right after the OP_SeekGE. So use the P2 operand of OP_SeekScan to point to the first instruction after OP_IdxGT. Problem found by dbsqlfuzz. (check-in: 091d7193 user: drh tags: trunk)
02:07
Disable the OP_SeekScan opcode of the in-scan-vs-index optimization when in PRAGMA reverse_unordered_selects mode, as the OP_SeekScan only works with forwards scans. Thanks to OSSFuzz for pointing out the problem to us. (check-in: 9a1cdf7e user: drh tags: branch-3.28)
02:02
Disable the OP_SeekScan opcode of the in-scan-vs-index optimization when in PRAGMA reverse_unordered_selects mode, as the OP_SeekScan only works with forwards scans. Thanks to OSSFuzz for pointing out the problem to us. (check-in: c75c3a3b user: drh tags: trunk)
2020-10-01
17:24
Add experimental "trigram" tokenizer to fts5. (check-in: c4e8ec79 user: dan tags: trunk)
17:15
Add the -trigram option to the fts5txt2db.tcl script. (Closed-Leaf check-in: a394dd26 user: dan tags: fts5-trigram)
16:10
Add tests for the trigram tokenizer. Fix minor issues. (check-in: 897ced99 user: dan tags: fts5-trigram)
15:46
Fix the OP_SeekScan opcode so that its variable names do not cause problems for the test/vdbe-compress.tcl script. (check-in: 7a78274a user: drh tags: trunk)
14:38
Remove a debugging printf() accidentally left in the previous check-in. (check-in: e9d1efa5 user: drh tags: trunk)
14:36
The IN-early-out optimization does not work for virtual tables. Do not try to use it there. Fix for ticket [2d5a3163563d559f]. Test cases in TH3. (check-in: dbec6910 user: drh tags: trunk)
2020-09-30
20:35
Add experimental unicode-aware trigram tokenizer to fts5. And support for LIKE and GLOB optimizations for fts5 tables that use said tokenizer. (check-in: 0d7810c1 user: dan tags: fts5-trigram)
18:22
Improved query optimization for multi-column indexes where the second or later columns are constrained by an IN operator and the earlier index columns limit the search to a small number of rows. Use the new OP_SeekScan opcode which does scanning of the relevant range of the index but gives up and falls back to doing a seek if the number of rows scanned grows to large, in order to guard against pathological cases where the estimated number of rows to be scanned is far too small. (check-in: f07ac3fb user: drh tags: branch-3.28)
18:06
Improved query optimization for multi-column indexes where the second or later columns are constrained by an IN operator and the earlier index columns limit the search to a small number of rows. Use the new OP_SeekScan opcode which does scanning of the relevant range of the index but gives up and falls back to doing a seek if the number of rows scanned grows to large, in order to guard against pathological cases where the estimated number of rows to be scanned is far too small. (check-in: 4a43430f user: drh tags: trunk)
18:03
For the OP_SeekScan opcode, adjust the number of steps run before giving up based on the estimated number of comparisons needed to perform a seek. (Closed-Leaf check-in: dc4172e6 user: drh tags: in-scan-vs-index)
17:32
Back out the incorrect optimization of check-in [e51ecadcbdef5ce6] as ticket [5c4e7aa793943803] reports a case where the optimization does not work. (check-in: 7395e96b user: drh tags: trunk)
15:36
In the query flattener when substituting expression Y in place of expression X, if X is marked has having come from an ON or USING clause of a LEFT JOIN, then be sure that all subexpressions of Y, not just the root node of Y, are similarly marked. Otherwise, if Y is an AND operator, it will be split up during WHERE clause analysis and the subexpressions will not get the special treatment needed by LEFT JOIN ON/USING clauses. Fix for ticket [66e4b0e271c47145]. (check-in: 69f9eb73 user: drh tags: trunk)
09:17
Better understanding of savepoint code (check-in: ce6d8d62 user: shearer tags: trunk)
00:48
Add an sqlite3FaultSim() call to btreeNext() to make it easier to simulate I/O errors in calls to sqlite3BtreeNext(), and in OP_SeekScan. (check-in: 29cca775 user: drh tags: in-scan-vs-index)
00:10
In the OP_SeekScan opcode, changes to pOp must occur after the call to VdbeBranchTaken() so that the VdbeBranchTaken() attributes the branch to the correct opcode. (check-in: 61fbe7aa user: drh tags: in-scan-vs-index)
2020-09-29
23:52
The OP_SeekScan opcode is a no-op if the cursor is not pointing to a valid row upon entry. (check-in: 4afc96b5 user: drh tags: in-scan-vs-index)
20:22
Coverage testing of the OP_SeekScan opcode. Fix a problem that comes up when OP_SeekScan reaches the end of the table. (check-in: 9e57e758 user: drh tags: in-scan-vs-index)
17:29
Improved comments on the new OP_SeekScan opcode. (check-in: 6110fdd5 user: drh tags: in-scan-vs-index)
16:05
Improved performance by manually in-lining the sqlite3VdbeIdxKeyCompare() routine for the OP_IdxGT opcode and its kin. (check-in: 2206a2c8 user: drh tags: in-scan-vs-index)
15:32
Typo fix to repair the early-out optimization. Also avoid unnecessary OP_SeekHit opcodes. (check-in: 8fd7d8df user: drh tags: in-scan-vs-index)
01:48
The OP_SeekScan opcode works, but using it requires disabling the IN-earlyout optimization because the OP_IfNoHope opcode might move the cursor. (check-in: f3c36b84 user: drh tags: in-scan-vs-index)
2020-09-28
19:51
Revisiting the IN-scan optimization to try to fix it for the corner case where the statistics deceive the query planner into using a scan when an indexed lookup would be better. This check-in changes the code generation to do the IN-scan using a new OP_SeekScan opcode. That new opcode is designed to abandon the scan and fall back to a seek if it doesn't find a match quickly enough. For this work-in-progress check-in, OP_SeekScan is still a no-op and OP_SeekGE still ends up doing all the work. (check-in: d720b698 user: drh tags: in-scan-vs-index)
15:49
Small performance improvement and size reduction by reducing the size of the WhereTerm object. (check-in: 43f7ddad user: drh tags: trunk)
13:34
Avoid the possibility of integer overflow on the --pagecache option to the CLI. See forum post 10a2892377 (check-in: d3d13df3 user: drh tags: trunk)
2020-09-25
17:17
Clarify (check-in: 14dba0f3 user: shearer tags: btree-code-documentation)
16:54
Distinguish between checkpoints (WAL-only, implementation specific) and savepoints (Btree internal implementation of COMMIT/ROLLBACK subtransactions) and SQL SAVEPOINT (identical name for SQL-level subtransactions) (check-in: ae686ab6 user: shearer tags: btree-code-documentation)
14:26
Reset to trunk's func. Still learning Fossil. (check-in: a4840cf5 user: shearer tags: btree-code-documentation)
13:56
More classification of functions. Fix incorrect comment that sqlite3BtreeCursorHasHint() is only used within asserts. (check-in: 78d8db7c user: shearer tags: btree-code-documentation)
09:42
Merge recent trunk changes into the btree-code-documentation branch (check-in: 3a576608 user: shearer tags: btree-code-documentation)
08:17
Add reminder comment that, by definition, these functions won't be called from elsewhere in SQLite. Useful to remember for beginners who may suspect unusued code. (check-in: 6f5c1fde user: shearer tags: btree-code-documentation)
2020-09-24
11:41
Added context to explain that the test coverage is about MC/DC in general, not just an SQLite-specifc test harness. (check-in: 770dbedd user: shearer tags: btree-code-documentation)
06:37
Group metadata definitions together (check-in: 5c306f42 user: shearer tags: btree-code-documentation)
2020-09-23
17:31
Figured out where/how sqlite3BtreeRowCountEst() is called (check-in: a4653715 user: shearer tags: btree-code-documentation)
2020-09-21
20:18
Fix harmless compiler warning seen with MSVC. (check-in: 4591ee03 user: mistachkin tags: trunk)
14:53
In fts5 integrity checks, do not compare the contents of the index against an external content table unless specifically requested. (check-in: 78216369 user: dan tags: trunk)
2020-09-20
13:33
Remove a new assert() that the compiler finds is always true at compile-time, to avoid a compiler warning. (check-in: 8bbaee23 user: drh tags: trunk)
12:10
Attempt to silence harmless static analyzer warnings in Lemon and in the Lemon-generated parser. (check-in: de8ce22a user: drh tags: trunk)
2020-09-17
21:11
Fix a typo in the documentation comment for sqlite3_preupdate_hook(). (check-in: 4542d194 user: dan tags: trunk)
17:01
Fix a problem in sqlite-expert causing it to ignore equality constraints on the second or subsequent columns of a multi-column PRIMARY KEY. (check-in: c666c85a user: dan tags: trunk)
15:16
Fix a problem in fts5 causing the in-memory hash table to be flushed more often than necessary. (check-in: 9a55601d user: dan tags: trunk)
15:04
Order btree.h by logical function, add comments (check-in: ab53b317 user: shearer tags: btree-code-documentation)
14:16
Fix a "jump depends on unitialized value" valgrind/asan error in fts5. (check-in: 66f94d62 user: dan tags: trunk)
11:56
Earlier detection of corruption in the rtreecheck() SQL function to prevent a (harmless) read of an uninitialized value. (check-in: e2074b24 user: drh tags: trunk)
11:32
Prevent use-after-free of the u.vtab.idxStr string following an OOM while generating the OP_VFilter opcode. (check-in: 751fe4ed user: drh tags: trunk)
00:46
DISTINCT may not be ignored inside a UNION ALL common table expression. Fix for ticket [c51489c3b8f919c5] (check-in: 7d2b590d user: drh tags: trunk)
2020-09-16
19:48
Fix a pair of assert()s in "PRAGMA foreign_key_check" that might have given a false-positive following an OOM. (check-in: 9ea3039b user: drh tags: trunk)
16:55
Fix harmless compiler warnings in Lemon. (check-in: 6c94ba4b user: drh tags: trunk)
16:55
Merge bugfixes made since version 3.33.0 into this branch. (Leaf check-in: 2e269dcd user: dan tags: reuse-schema-3.33)
16:49
Fix a buffer overread found by OSSFuzz that could occur if a WITHOUT ROWID table with many columns was NATURAL JOINed against itself. (Leaf check-in: 807643c5 user: dan tags: branch-3.33)
16:48
Do not invoke usleep() for more than 999999 microseconds. (check-in: 1f0055d0 user: dan tags: branch-3.33)
16:45
Fix a tsan error that could occur when using shared-cache mode. (check-in: 61981b97 user: dan tags: branch-3.33)
16:44
Fix another (harmless in practice) tsan error in shared-cache mode. (check-in: 553e20c3 user: dan tags: branch-3.33)
16:41
Apply the same fix for ticket [9eda2697f5cc1aba] to text-to-integer conversions that was done for floating point conversions by check-in [1c76f1d8ec0937a2]. (check-in: 1b4801de user: dan tags: branch-3.33)
16:40
Correctly handle expressions like "x IS (not) true/false" within the rhs of IN() expressions. Fix for [f3ff1472]. (check-in: 42361033 user: dan tags: branch-3.33)
16:39
Fix a crash that could occur in SQLITE_MAX_EXPR_DEPTH=0 builds when processing SQL containing syntax errors. (check-in: 6438db45 user: dan tags: branch-3.33)
16:38
Do not skip over TK_IF_NULL_ROW operators when bypassing TK_COLLATE operators. Fix to check-in [ac31edd3eeafcef4] which was itself a fix for ticket [45f4bf4eb4ffd788]. (check-in: 85041611 user: dan tags: branch-3.33)
2020-09-15
20:48
Fix a buffer overread found by OSSFuzz that could occur if a WITHOUT ROWID table with many columns was NATURAL JOINed against itself. (check-in: 3d35fa0b user: dan tags: trunk)
12:29
Do not invoke usleep() for more than 999999 microseconds. (check-in: 1f5ed852 user: drh tags: trunk)
2020-09-11
15:01
Catch fts5 index corruption caused by issuing 'delete' commands with incorrect data earlier in some cases. Also fix a couple of test script problems. (check-in: b79f19ed user: dan tags: trunk)
2020-09-10
15:09
Try again to fix the typo in the sqlite3_txn_state() documentation. (check-in: 6d1ab040 user: drh tags: trunk)