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100 check-ins occurring around 74f399d81fe250e0.

2017-10-03
03:01
Do not compute column and row size estimates for the transient Table objects associated with the result set of a SELECT statement, since those estimates are never used for anything constructive. (check-in: e4342fd4 user: drh tags: trunk)
2017-10-02
23:50
Mark a single branch within sqlite3SelectExpand() as an optimization. (check-in: 3a4ffb21 user: drh tags: trunk)
23:30
Simplification to sqlite3SelectPrep() for improved testability. (check-in: 5bf2ccb9 user: drh tags: trunk)
21:29
Add the OK_IF_ALWAYS_TRUE() and OK_IF_ALWAYS_FALSE() macros for marking conditionals that improve performance but do not change the outcome. (check-in: 6035c9b2 user: drh tags: trunk)
13:20
Avoid using lookaside memory for persistent virtual table structures. (check-in: d815f255 user: drh tags: trunk)
02:52
The query planner now always prefers to implement a FROM-clause subquery using a co-routine rather than flattening the subquery into the outer query. (check-in: c9104b59 user: drh tags: trunk)
02:32
Improvements to a comment in lempar.c. No code changes. (check-in: 8000d230 user: drh tags: trunk)
2017-09-30
11:47
More details in the header comment of pushDownWhereTerms(). No changes to code. (Closed-Leaf check-in: 92848623 user: drh tags: prefer-coroutine-sort-subquery)
10:50
Make sure the SQLITE_Stat34 optimization switch is always 0x800, a value which is hard-coded in the TH3 test suite. (check-in: 6aed4ea3 user: drh tags: prefer-coroutine-sort-subquery)
01:25
Fix unreachable conditionals and revise a testcase that was made obsolete by the changes on this branch. (check-in: 71f0adf7 user: drh tags: prefer-coroutine-sort-subquery)
2017-09-29
22:13
Always render a subquery that is not part of a join as a co-routine. (check-in: 6b1651d7 user: drh tags: prefer-coroutine-sort-subquery)
16:08
Merge the query flattener comment improvements from trunk. (check-in: f62cd4d9 user: drh tags: prefer-coroutine-sort-subquery)
16:07
Clean up the comments on the query flattener to more clearly and accurately express the conditions under which the flattener is able to run. (check-in: 0840f9f8 user: drh tags: trunk)
14:31
Merge changes from trunk. (check-in: 06f432fb user: drh tags: prefer-coroutine-sort-subquery)
12:44
Make sure the 6th parameter to the authorizer callback for view subqueries has the correct view name. (check-in: 2a45bbc9 user: drh tags: trunk)
12:12
Better names for subqueries in EXPLAIN comments. (check-in: 04ef40a8 user: drh tags: trunk)
2017-09-28
20:06
Do not flatten subqueries that contain an ORDER BY or GROUP BY clause and can be implemented using a co-routine. (check-in: 042d655d user: drh tags: prefer-coroutine-sort-subquery)
17:29
Remove the (undocumented) query-planner control that prevents a "SELECT ALL" subquery in FROM clause from being implemented as a co-routine. This control was added by [a29e117d7ec], where it was called a "stop-gap". (check-in: ff2f5a31 user: drh tags: trunk)
16:56
Fix over-length source code lines in select.c. No logic changes. (check-in: fd3267ef user: drh tags: trunk)
13:47
Fix an issue introduced by check-in [4cd2a9672c59] (2017-03-03) that could allow a negative value in the 3rd parameter to memmove() when defragmentPage() is called on a btree page with a corrupted freeblock list. The corruption is now detected early and results in an SQLITE_CORRUPT return before the memmove() is reached. (check-in: 5b9ae693 user: drh tags: trunk)
01:58
Add new routines to simplify dealing with collating sequences in expressions: sqlite3ExprNNCollSeq() and sqlite3ExprCollSeqMatch(). (check-in: 490e488e user: drh tags: trunk)
01:09
Indexes on expressions with a COLLATE clause are able to satisfy an ORDER BY with the same COLLATE clause. (check-in: 04130018 user: drh tags: trunk)
00:01
In two places, change the magic number -1 to its proper symbol XN_ROWID. (check-in: 80277d2f user: drh tags: trunk)
2017-09-27
16:51
Disable tests for the LIKE optimization when ICU is enabled, since the LIKE optimization only works for the built-in LIKE operator and ICU overrides the built-in. (check-in: f5ef2e1b user: drh tags: trunk)
2017-09-25
09:37
Add an extra snapshot related test case. (check-in: 24a95e14 user: dan tags: trunk)
2017-09-23
07:46
Experimental change so that snapshot transactions always lock the wal file - preventing writers or truncate-checkpointers from wrapping it. (Closed-Leaf check-in: d71eeaab user: dan tags: snapshots-lock-wal)
2017-09-22
20:18
Merge in all the trunk enhancements of the previous 7 months. The LIKE optimization has stopped working when there is an ESCAPE - that problem will be addressed in a subsequent check-in. (Leaf check-in: 8d2a1cca user: drh tags: est_count_pragma)
16:23
Use the updated Win32 VFS semantics for winOpen from check-in [5d03c738e9] for WinRT, et al, as well. (check-in: 2c03d8b8 user: mistachkin tags: trunk)
12:52
Partial backout of check-in [e0af9a904076]. It turns out we do need some extra space at the end of the record blob as an overrun area to use when decoding a maliciously malformed record. (check-in: 403b88a8 user: drh tags: trunk)
11:09
Cherrypick [ec37ad6d08] into this branch. With this patch, if SQLITE_SHARED_MAPPING is defined at build-time SQLite will use a single memory mapping for multiple connections to the same database file within a single process. (check-in: c7a5880d user: dan tags: begin-concurrent)
10:49
Merge latest trunk changes into this branch. (check-in: 307b802e user: dan tags: begin-concurrent)
00:24
Update the configure script so that it looks for tclsh8.7 ahead of tclsh8.6. (check-in: 0a12915b user: drh tags: trunk)
2017-09-21
20:43
In the Windows VFS, when trying to open a database file read/write, if it fails check to see if the file exists and is read-only and immediately fall back to a read-only open attempt, rather than running the AV retry loop. (check-in: 5d03c738 user: drh tags: trunk)
20:03
In the Windows VFS, do not emit an SQLITE_CANTOPEN error log message when falling back from SQLITE_OPEN_READWRITE to SQLITE_OPEN_READONLY. Wait until the open fails completely. (check-in: fa3f5bcc user: drh tags: trunk)
19:08
Fix harmless UB in the ICU extension. (check-in: 68e9a840 user: drh tags: trunk)
14:03
The sqlite3_snapshot_describe() interface useful for debugging snapshot logic. (Leaf check-in: 3fbfa9a8 user: drh tags: sqlite3_snapshot_describe)
13:11
Fix a potential use of an uninitialized pointer in RTree following an OOM error. (check-in: fd4ec0cd user: drh tags: trunk)
10:24
Fix a bug in tool/mksourceid.c: The mksourceid.c program was incorrectly including the "# Remove this line" line of the Fossil-generated "manifest" file in the SHA3 hash. That means that all SQLITE_SOURCE_IDs for trunk versions going back to check-in [30966d56] (2017-08-22) are incorrect. (check-in: 65765222 user: drh tags: trunk)
01:04
Revert one performance improvement changes from check-in [3b3e32d4cd07] as it was causing a reference to an uninitialized value. (check-in: f8b1c64d user: drh tags: trunk)
00:49
Fix the rendering of the P4_INTARRAY argument to the OP_IntegrityCk opcode in the output of EXPLAIN. (check-in: adc12c83 user: drh tags: trunk)
2017-09-20
18:47
Size and performance optimization on sqlite3VdbeMemGrow(). (check-in: 4b3f7eac user: drh tags: trunk)
18:07
The BLOB returned by sqlite3VdbeMemFromBtree() does not need to be zero-terminated. (check-in: e0af9a90 user: drh tags: trunk)
17:49
Small size and performance optimization in the bytecode engine. (check-in: 3b3e32d4 user: drh tags: trunk)
10:47
Improved resolution of large integer values in "CAST(x AS NUMERIC)". (check-in: 7f2bd4ff user: drh tags: trunk)
09:09
Updates to the "lemon.html" document received from Andy Goth. (check-in: 5b2002f3 user: drh tags: trunk)
2017-09-18
18:17
Add the sqlite3_mmap_warm() function as an extension in the ext/misc/mmapwarm.c source file. (check-in: 1b2de414 user: drh tags: trunk)
18:08
Fix a typo in the MSVC makefile. (Closed-Leaf check-in: 3235835b user: drh tags: mmap-warm)
16:28
Add extension "mmapwarm.c". Provides function sqlite3_mmap_warm(), used to "warm up" the memory mapping used by SQLite in mmap mode to access db file content. (check-in: d4a30b91 user: dan tags: mmap-warm)
13:16
Minor simplification of error message generation during compound query code generation. (check-in: a9447193 user: drh tags: trunk)
09:40
The out-of-bounds read on recovery fix of check-in [378afa16381a222a] caused problems for some corner-case error conditions. This alternative fix appears to work better. (check-in: 74f399d8 user: drh tags: trunk)
08:51
Merge latest trunk changes with this branch. (Leaf check-in: 2e573350 user: dan tags: shared-mapping-hack)
00:18
Fix the CSV virtual table extension so that it works when the default character is unsigned. (check-in: 42f07775 user: drh tags: trunk)
2017-09-17
19:45
Do not make the assumption (as check-in [4da49a95c0f07] incorrectly did) that the ExprList returned by sqlite3ExprListDup() would never be passed into sqlite3ExprListAppend(). Include a new test case that shows this sometimes does happen. (check-in: 29227d00 user: drh tags: trunk)
2017-09-16
20:58
Simplify the sqlite3VdbeGet() routine. Smaller, faster, and easier to maintain. (check-in: 5dbb255a user: drh tags: trunk)
2017-09-15
17:40
Remove an unnecessary parameter from selectInnerLoop(). (check-in: dd95887f user: drh tags: trunk)
15:38
Improved the header-comment documentation on sqlite3ExprCodeExprList(). No changes to code. (check-in: 5dc3ecb5 user: drh tags: trunk)
15:17
Optimization to the ExprList object to make it slightly smaller and faster. (check-in: 4da49a95 user: drh tags: trunk)
14:36
Fix a harmless comment typo. No changes to code. (check-in: f7f0bf1d user: drh tags: trunk)
2017-09-14
21:12
Add another test case for the problem fixed by the previous commit. (check-in: 1a7e0b61 user: dan tags: trunk)
20:41
Avoid an out-of-bounds read that can be caused by a specially constructed journal file. (check-in: cf5bf42c user: dan tags: trunk)
02:36
Avoid an out-of-bounds read on a recovery attempt using a carefully crafted database and rollback journal with mismatched page sizes. The test case for this is in TH3. (check-in: 378afa16 user: drh tags: trunk)
2017-09-13
20:20
Test case update due to PRAGMA integrity_check enhancements in [8525c30c]. No changes to code. (check-in: 43c6023b user: drh tags: trunk)
18:38
Experimental sqlite3_stmt_retryable() interface. (Leaf check-in: ebada072 user: drh tags: sqlite3_stmt_retryable)
12:55
Disable FTS3 matchinfo() tests that assume a littleEndian platform when running on bigEndian. (check-in: 87ccdf9c user: drh tags: trunk)
00:33
Improvements to PRAGMA integrity_check for better detection of malformed records. Integrity_check now avoids returning SQLITE_CORRUPT on a corrupt record. Also includes microoptimizations that I stumbled over while working on integrity_check. (check-in: 8525c30c user: drh tags: trunk)
00:13
PRAGMA integrity_check returns SQLITE_OK even if it encounters corruption while scanning indexes. (Closed-Leaf check-in: 81f62e99 user: drh tags: improved-integrity-check)
00:01
Fix test script comment. No changes to code. (check-in: a5a19492 user: mistachkin tags: trunk)
2017-09-12
23:58
Remove use of the rand_s() function (added by [139081bef9f63c3e]) as it appears to cause issues with some third-party DLLs. (check-in: 3a2793aa user: mistachkin tags: trunk)
20:09
Add the highly-experimental "PRAGMA noop_update=TRUE" command. (check-in: afe45271 user: drh tags: begin-concurrent-pnu)
18:49
Add the highly-experimental "PRAGMA noop_update=TRUE" command. (Leaf check-in: de2e3717 user: drh tags: pragma-noop-update)
18:11
Merge the mutex-free PRNG change into this branch. (check-in: 8b1fc4b9 user: dan tags: shared-mapping-hack)
18:03
Hack to have multiple connections to a single file share a single memory mapping of the databse file. (check-in: ec37ad6d user: dan tags: shared-mapping-hack)
15:05
Fix an error in [b22cdd67] that can cause a negative infinity to be (rarely) reported as a positive infinity. (check-in: 9780b23c user: drh tags: trunk)
13:27
Changes to (hopefully) get the build working with recent Intel compilers. (check-in: b22cdd67 user: drh tags: trunk)
00:24
Make sure all connections are closed in the pragma.test script. Test change only - no changes to code. (check-in: d7b7f038 user: drh tags: trunk)
2017-09-11
23:46
New test case for ticket [b899b6042f97f52d]. (check-in: 9d91ee5e user: drh tags: trunk)
20:54
Add support for new operators in virtual tables: !=, IS, IS NOT, IS NULL, and NOTNULL. (check-in: 3b7dbe9d user: drh tags: trunk)
19:47
Refactor names of constants and functions associated with the auxiliary operators for xBestIndex. (Closed-Leaf check-in: 0fb992af user: drh tags: vtab-extra-ops)
18:37
Minor adjustments to indentation and spacing for clarity. No changes to code. (check-in: d3153abd user: drh tags: vtab-extra-ops)
08:53
Add tests to check that affinities work with != operators on virtual table column values. No changes to code. (check-in: 8d24e080 user: dan tags: vtab-extra-ops)
2017-09-10
01:06
Simplifications to the PRAGMA integrity_check code generator. (check-in: 99b9140c user: drh tags: improved-integrity-check)
2017-09-09
22:46
Simplification and performance improvement to sqlite3_reset(). (check-in: b6425d01 user: drh tags: improved-integrity-check)
20:38
Improved detection of malformed records by PRAGMA integrity_check. (check-in: 8fa923ca user: drh tags: improved-integrity-check)
19:41
Enhance the vtab interface to handle IS, !=, IS NOT, IS NULL and IS NOT NULL constraints. (check-in: 34c8e952 user: dan tags: vtab-extra-ops)
08:03
Use a mutex-free PRNG for the random() and randomblob() SQL functions and for the randomness used during checkpoint operations. (Leaf check-in: e63d1a7c user: drh tags: mutex-free-randomness)
06:10
Merge trunk enhancements (check-in: 6a0b9d9d user: drh tags: apple-osx)
00:51
Fix harmless compiler warnings seen with MSVC. (check-in: faa22e29 user: mistachkin tags: trunk)
2017-09-08
17:48
Have the header comment for sqlite3Checkpoint() mention TRUNCATE along with the other three checkpoint types. No changes to code. (check-in: e1e3ca7e user: dan tags: trunk)
2017-09-07
09:56
Prevent a possible crash when trying to recover using a carefully corrupted \ and truncated rollback journal. (Test case in TH3) (check-in: 02828d71 user: drh tags: trunk)
2017-09-05
20:16
Update "PRAGMA integrity_check" to detect inconsistencies between a single record's header and body. (check-in: 9e393a0e user: dan tags: trunk)
17:23
Fix a comment describing the xRowid method of the "series" virtual table. No code changes. (check-in: 868cd196 user: dan tags: trunk)
16:24
Add experimental API sqlite3rbu_temp_size_limit(). For limiting the amount of temporary disk space RBU uses. (check-in: 7fdd6298 user: dan tags: trunk)
2017-09-04
19:31
Use the SQLITE_CORRUPT_BKPT return code in a couple more places. (check-in: 72d22c22 user: mistachkin tags: trunk)
18:44
Add the 'mksourceid' executable to the clean target for MSVC. (check-in: 77854694 user: mistachkin tags: trunk)
00:33
Proposed fix for ticket [b899b6042f97f5] (check-in: c7f9f47b user: drh tags: trunk)
00:19
Fix recent test cases in test/indexepxr2.test so that they work even without SQLITE_ENABLE_STAT4 and SQLITE_ENABLE_JSON1. (check-in: 03f3cc03 user: drh tags: trunk)
2017-09-01
14:50
Add the new sqlite3PagerUnrefPageOne() pager method to deal with the special case of unreferencing page1. (check-in: b2e2100c user: drh tags: trunk)
12:57
Remove an obsolete optimization in pcache that due to more recent changes was recently making the code a little slower. (check-in: c4e7e175 user: drh tags: trunk)
12:18
Small size and performance improvement in pcacheManageDirtyList() by not zeroing the PgHdr.pDirtyNext and PgHdr.pDirtyPrev pointers for PgHdr objects that are not on the dirty list. (check-in: 919863b1 user: drh tags: trunk)
2017-08-31
21:11
Clarify the documentation about "protected" versus "unprotected" sqlite3_value objects. No changes to code. (check-in: 4094a341 user: drh tags: trunk)