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2018-07-05
20:33
Update the recipe for resetting a database using SQLITE_DBCONFIG_RESET_DATABASE. check-in: c43dd23fb0 user: dan tags: trunk
20:05
Get the json_group_array() and json_group_object() SQL functions working as window functions. check-in: 916cdc83f5 user: drh tags: trunk
18:34
Return an error if a "RANGE" window-frame uses "<expr> PRECEDING" or "<expr> FOLLOWING". check-in: 786c87ba41 user: dan tags: trunk
18:19
Fix a problem in the xInverse method of window-function group_concat(1). check-in: 7339128310 user: dan tags: trunk
17:35
Fix the .dump command in the command-line shell so that it does not show extraneous SELECT statements when ".echo on" is enabled. check-in: 11763cac33 user: drh tags: trunk
17:16
In wal mode, if a "BEGIN EXCLUSIVE" command (or any other command that upgrades from no transaction directly to a write transaction) hits an SQLITE_BUSY_SNAPSHOT error, change the error code to SQLITE_BUSY to indicate to the caller that the condition may be transient. check-in: e6108047cb user: dan tags: trunk
17:03
Fix a typo inside an assert() statement introduced by the previous commit. Closed-Leaf check-in: e335772847 user: dan tags: exp-busy-snapshot-fix
15:46
In wal mode, if a "BEGIN EXCLUSIVE" command (or any other command that upgrades from no transaction directly to a write transaction) hits an SQLITE_BUSY_SNAPSHOT error, change the error code to SQLITE_BUSY to indicate to the caller that the condition may be transient. check-in: 221ff63e79 user: dan tags: exp-busy-snapshot-fix
2018-07-04
14:28
Experimental planner change to avoid a skip-scan if a regular index scan on the same index columns can be done instead. Leaf check-in: 32924446db user: dan tags: exp-avoid-expensive-skipscan
2018-07-03
20:17
Test that a race condition can cause a "BEGIN EXCLUSIVE" to return SQLITE_BUSY_SNAPSHOT in wal mode. check-in: 5a12db75d1 user: dan tags: trunk
2018-07-02
17:45
Fix a problem in the xInverse callback for the built-in sum() window function. check-in: b656364738 user: dan tags: trunk
17:14
Fix a segfault caused by having identical window functions in the select-list and ORDER BY clause of a SELECT statement. check-in: 693b4350d7 user: dan tags: trunk
15:03
Fix a crash caused by a LIKE pattern that consists of a single escape character. Problem found by OSSFuzz. check-in: bb9bfc3a12 user: dan tags: trunk
12:07
Fix a segfault caused by invoking a regular aggregate as a window-function. And some problems with count(*) when used as a window-function. check-in: 4f3c8a82fd user: dan tags: trunk
2018-07-01
16:05
Quick patch to the Lemon parser template to avoid an array overread reported by OSSFuzz. A proper fix involves enhancements to the table generators in Lemon to make the overread impossible. That fix will take longer to implement. The current check-in is a stop-gap. check-in: 3f6730be4c user: drh tags: trunk
2018-06-30
20:26
Avoid a warning in fts5.c due to not using generated routine sqlite3Fts5ParserFallback(). check-in: 65ff5144a5 user: dan tags: trunk
20:15
Merge implementation of SQL window functions from the exp-window-functions into trunk. check-in: 17198a1206 user: dan tags: trunk
20:00
Fix a minor problem in the code for determining whether or not an SQL statement is SQLITE_TOOBIG. Closed-Leaf check-in: 763e6c9e2b user: dan tags: exp-window-functions
19:12
Merge all changes from the weak-fallback branch except those related to the weak-fallback feature itself. check-in: aad718fb1a user: dan tags: exp-window-functions
18:54
Have the tokenizer handle fallback for tokens "OVER" and "FILTER" in the same way as it does for "WINDOW". Leaf check-in: 12d819e1c1 user: dan tags: weak-fallback
2018-06-29
20:43
Further performance related tweaks for sqlite3RunParser(). check-in: 5eb4776598 user: dan tags: weak-fallback
20:21
Further tweaks to sqlite3RunParser(). check-in: eef61ffab7 user: dan tags: weak-fallback
19:54
Improve on the previous checkin. Still a bit slow. check-in: c1fb41aa7b user: dan tags: weak-fallback
17:44
Instead of using a lemon %fallback directive, have the tokenizer try to figure out whether an instance of "WINDOW" should be TK_WINDOW or TK_ID. check-in: 022079cb0d user: dan tags: weak-fallback
2018-06-28
20:05
Modifications to parse.y to better support backwards compatibility for the "window" keyword. check-in: 7c4b879bdb user: dan tags: weak-fallback
03:38
Introduce the concept of "weak fallback" in the parser. A weak fallback only occurs if a syntax error would result otherwise. check-in: c41d7079fb user: drh tags: weak-fallback
2018-06-27
20:24
Add missing VdbeCoverage() and VdbeCoverageNeverTaken() macros to window.c. check-in: 4383cb68a1 user: dan tags: exp-window-functions
19:48
Avoid redundant ORDER BY operations when rewriting SELECT statements that contain window functions. check-in: 336de43a47 user: dan tags: exp-window-functions
2018-06-26
20:19
Merge latest trunk changes. check-in: d9f814b443 user: dan tags: exp-window-functions
2018-06-25
20:34
Add documentation comment for sqlite3_create_window_function(). And further tests. check-in: 3f2705b933 user: dan tags: exp-window-functions
11:42
Fix another problem that could cause a crash when a window function was used in a view. check-in: e954145a3a user: dan tags: exp-window-functions
2018-06-23
19:29
Fix problems with using window-functions in correlated sub-queries. check-in: 3e23cfc813 user: dan tags: exp-window-functions
16:26
Fix a problem with using LIMIT in window-function queries. check-in: c1abd2dda4 user: dan tags: exp-window-functions
07:59
Fix a problem with using a window-function SELECT as a FROM clause sub-query in some circumstances. check-in: 11d733396f user: dan tags: exp-window-functions
2018-06-22
20:51
Omit all window-function related code when building with SQLITE_OMIT_WINDOWFUNC. check-in: 5f04b01646 user: dan tags: exp-window-functions
17:57
Merge latest trunk changes. check-in: ebe65b2386 user: dan tags: exp-window-functions
2018-06-21
19:20
Fix a problem with handling single row partitions in the percent_rank() window function. check-in: b84fbf16ea user: dan tags: exp-window-functions
2018-06-20
09:23
Add tests to improve coverage of code in window.c. Fix a problem with "SELECT row_number() OVER ()". check-in: f41b6b7317 user: dan tags: exp-window-functions
2018-06-19
19:15
Merge latest trunk changes with this branch. check-in: 6ad0e64b46 user: dan tags: exp-window-functions
18:11
Fix a problem caused by a sub-query containing a window function in the FROM clause of a query that itself uses a window function. check-in: f4b1b6f85b user: dan tags: exp-window-functions
17:13
Fix a problem with using min() or max() as a window function. check-in: 801074ce63 user: dan tags: exp-window-functions
2018-06-18
20:34
Fix problems with using window functions in CREATE VIEW statements. check-in: 943bccd2a6 user: dan tags: exp-window-functions
17:36
Ensure that all four callbacks are provided when registering a window function (otherwise SQLITE_MISUSE is returned). check-in: 5720dcd8b1 user: dan tags: exp-window-functions
16:55
Add new API function sqlite3_create_window_function(), for creating new aggregate window functions. check-in: da03fb4318 user: dan tags: exp-window-functions
2018-06-15
20:46
Add extra OOM test. check-in: ac251f7260 user: dan tags: exp-window-functions
19:01
Fix another problem in lead()/lag(). And some errors that could occur following OOM faults. check-in: fadd4dc119 user: dan tags: exp-window-functions
16:10
Fix a bug in the lead() and lag() window functions causing them to fail when used in queries featuring multiple window functions. check-in: 3839fb18f9 user: dan tags: exp-window-functions
2018-06-14
20:52
Fix a problem with handling of statements containing two or more different windows. check-in: 567e09ef2a user: dan tags: exp-window-functions
19:06
Fix problem with window functions min() and max() when used with a PARTITION clause and a frame starting point other than "UNBOUNDED PRECEDING". check-in: 43eb1e75a4 user: dan tags: exp-window-functions
14:30
Merge latest trunk changes into this branch. check-in: 5cf5f1808a user: dan tags: exp-window-functions
14:27
Improve comments and code legibility in new file window.c. check-in: bb915854d4 user: dan tags: exp-window-functions
2018-06-13
20:29
Fix problems with "RANGE BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING" window frames. check-in: c34f31dbd7 user: dan tags: exp-window-functions
2018-06-12
20:53
Fix another issue to do with window-functions in aggregate queries. check-in: 6413e38a17 user: dan tags: exp-window-functions
18:40
Fix some problems with using window-functions in aggregate queries. check-in: fe7081e095 user: dan tags: exp-window-functions
2018-06-11
20:50
Clarify the relationship between a Window object and its associated Expr. check-in: 0cd55e98a4 user: dan tags: exp-window-functions
18:16
Fix handling of window frames containing negative number of rows. e.g. "ROWS x PRECEDING AND y PRECEDING" where (x<y). check-in: b6d9c7eda8 user: dan tags: exp-window-functions
11:19
Fix a typon in main.mk. check-in: e74f86f271 user: dan tags: exp-window-functions
2018-06-10
07:42
Update Makefile.msc to include window.c in the build. check-in: 16db73842a user: dan tags: exp-window-functions
2018-06-09
18:09
Merge recent trunk changes with this branch. check-in: c71f23590c user: dan tags: exp-window-functions
17:58
Update the amalgamation build script to include window.c. check-in: 21d2f4a62e user: dan tags: exp-window-functions
17:43
Add support for FILTER clause on aggregate window functions. check-in: ceaf798ea0 user: dan tags: exp-window-functions
16:49
Slightly smaller and faster code by encapsulating wal-index hash table location information in a separate WalHashLoc object rather than passing around the various elements as separate variables. check-in: 538a365b7a user: drh tags: trunk
14:13
Improved comments an presentation for the recent IN operator decision improvement. check-in: 31e480f68d user: drh tags: trunk
02:49
Performance improvement to sqlite3WhereExprUsage(). check-in: fd09341390 user: drh tags: trunk
01:12
Compute the bitmask of indexed columns for each index once when the Index objecct is constructed, instead of recomputing it every time it is needed. check-in: d735872ec3 user: drh tags: trunk
00:09
Avoid invoking the whereLoopAddOr() routine in the query planner if there are no OR operators in the WHERE clause, thus speeding up query planning slightly. check-in: 292724ffc4 user: drh tags: trunk
2018-06-08
23:23
When the query planner has the opportunity to use an IN operater constraint on a term of an index other than the left-most term, use the estimated number of elements on the right-hand side of the IN operator to determine if makes sense to use the IN operator with index lookups, or to just do a scan over the range of the table identified by the index terms to the left. Only do this if sqlite_stat1 measurements are available as otherwise the performance estimates will not be accurate enough to discern the best plan. Bias the decision slightly in favor of using index lookups on each element of the IN operator. check-in: 2cbbabdf5e user: drh tags: trunk
21:21
Only choose to scan an IN operator rather than use an index if we have real STAT1 data to suggest it is advantageous. Closed-Leaf check-in: 30e874661d user: drh tags: in-scan-vs-index
20:58
Add support for the WINDOW clause. check-in: 19c983b511 user: dan tags: exp-window-functions
19:54
Merge the btreeNext() assertion bug fix from trunk. check-in: 11bd66e090 user: drh tags: in-scan-vs-index
19:13
Fix an assert() that can be false for a corrupt database and a strange query that uses a recursive SQL function to delete content from a corrupt database file while it is being queried. check-in: 99057383ac user: drh tags: trunk
18:22
Consider doing a partial table scan to fulfill an IN operator rather than using an index. Try to pick the plan with the lowest cost. check-in: 1fa40a78fe user: drh tags: in-scan-vs-index
16:11
Do not flatten sub-queries that contain window functions. check-in: 236cb75bd1 user: dan tags: exp-window-functions
11:45
Fixes to allow group_concat() to be used as a window function. check-in: 89bbc9ba8f user: dan tags: exp-window-functions
2018-06-07
20:35
Merge latest trunk changes with this branch. check-in: 2510220342 user: dan tags: exp-window-functions
20:08
Add window functions lag() and lead(). check-in: ef34207073 user: dan tags: exp-window-functions
18:13
The IN-early-out optimization: When doing a look-up on a multi-column index and an IN operator is used on a column other than the left-most column, then if no rows match against the first IN value, check to make sure there exist rows that match the columns to the right before continuing with the next IN value. check-in: 09fffbdf9f user: drh tags: trunk
18:01
Fix the assert()s in the byte-code engine that prove that cursors are unidirectional. Closed-Leaf check-in: 4b0b4e1403 user: drh tags: multikey-opt-idea
17:45
Add support for window function first_value(). check-in: 060b264028 user: dan tags: exp-window-functions
17:32
Remove the NextIfOpen and PrevIfOpen opcodes which are no longer needed when the IN-early-out optimization is working. check-in: 439c816227 user: drh tags: multikey-opt-idea
16:07
Test cases. check-in: 085e863713 user: drh tags: multikey-opt-idea
15:54
Fix problems with the nth_value() function. check-in: 63002b9a09 user: dan tags: exp-window-functions
15:28
Merge the ".stat/.eqp" CLI fix from trunk. check-in: a91cad3381 user: drh tags: multikey-opt-idea
15:23
Avoid using a prepared statement for ".stats on" after it has been closed by the ".eqp full" logic. Fix for ticket [7be932dfa60a8a6b3b26bcf76]. check-in: bb87c054b1 user: drh tags: trunk
14:59
Add the WHERE_IN_EARLYOUT flag and use it to clarify the logic of this optimization. check-in: 522f1eacc2 user: drh tags: multikey-opt-idea
14:32
Merge recent trunk enhancements. check-in: e9d7bf4f7b user: drh tags: multikey-opt-idea
2018-06-06
23:31
Change a comma into a logically equivalent but semantically clearer semicolon. check-in: 71f97f0f82 user: drh tags: trunk
20:55
More space and performance enhancements to sqlite3VdbeRecordCompare(). check-in: 83a60ff056 user: drh tags: trunk
20:51
Add implementation of nth_value() window function. check-in: eb1fb420ac user: dan tags: exp-window-functions
20:29
Small performance optimization in sqlite3VdbeRecordCompareWithSkip() for the common case where the comparison is equal. check-in: 1e616e256a user: drh tags: trunk
19:48
Rearrange the order of some checks in the integrity_check pragma for a very slight performance gain. check-in: 4b853f0205 user: drh tags: trunk
18:50
Fix the sqlite3BeginTrans() calls within the snapshot extension. check-in: 1fef7ad25b user: drh tags: trunk
17:45
Another minor optimization to OP_Transaction. check-in: d80077aee3 user: drh tags: trunk
16:28
Change sqlite3BtreeBeginTrans() to return the BTREE_SCHEMA_COOKIE, for a small speed improvement when starting new transactions. check-in: a10662aa91 user: drh tags: trunk
01:18
Fix the ".archive" command in the CLI (and the corresponding -A command-line option) so that it silently ignores filenames that contain "../" in their names. This prevents the "Zip Slip" attack. check-in: 27291f2d7f user: drh tags: trunk
2018-06-05
23:51
Update the version number to 3.25.0 for the next development cycle. check-in: 7598236c35 user: drh tags: trunk
23:21
Avoid unnecessary loads of columns in an aggregate query that are not within an aggregate function and that are not part of the GROUP BY clause. check-in: e15e100660 user: drh tags: trunk
20:45
Add the OP_IfNoHope and OP_SeekHit opcodes used to reduce the number of unnecessary sqlite3BtreeMovetoUnpacked() calls when checking for an early exit on IN-operator loops. Futher optimizations are likely possible here. check-in: 6bf251af43 user: drh tags: multikey-opt-idea
20:04
Calculate non-aggregate expressions in the SELECT list of an aggregate query that does not use min() or max() once per group, instead of once per row visited. Closed-Leaf check-in: dce2dfbe15 user: dan tags: exp-agg-opt
16:16
Add implementation of last_value() window function. check-in: 2493ce1a40 user: dan tags: exp-window-functions
15:16
Use an OP_NotFound opcode to cancel futile IN operators early. The current implementation is suboptimal because it always runs teh OP_NotFound. This still needs to be enhanced to only do the OP_NotFound if no results have been seen on the current loop. check-in: 87a9fc504f user: drh tags: multikey-opt-idea