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Commit Graph

968 Commits

Author SHA1 Message Date
drh
a22a75e5ca Fix the OFFSET clause so that it works correctly on queries that lack 
a FROM clause.  Ticket [07d6a0453d4ed8].

FossilOrigin-Name: 179ef81648b0ad557df78b7712f216b876b6fb65
 2014-03-21 18:16:23 +00:00
drh
f9f1bdb0c8 Merge trunk fixes for "x IN (?)" handling. 
FossilOrigin-Name: eca35871c34374ca9189c7c9b6d490ac3c30357f
 2014-03-20 20:56:49 +00:00
drh
2b59b3a4c8 Convert expressions of the form "X IN (?)" with exactly one value on the 
RHS of the IN into equality tests:  "X=?".  Add test cases to verify that
statements work correctly on this corner case.
Fix for ticket [e39d032577df6942].

FossilOrigin-Name: e68b427afbc82e201c64474117851aa4c9eb0c92
 2014-03-20 13:26:47 +00:00
drh
0c8a934cb4 Fix an unnecessarily obtuse use of a bitmask flag. 
FossilOrigin-Name: ca3140813198ab7ce470cf86334e55207f3461f9
 2014-03-20 12:17:35 +00:00
drh
6284db908a Fix query planner weights associated with choosing block-sorting. Fix 
block sorting of tables with collating functions.  Fix various test cases.
All "veryquick" tests are now passing, though more tests need to be added.

FossilOrigin-Name: 01afbf97c0ff29667806e9a7c4d74ca717819de5
 2014-03-19 23:24:49 +00:00
drh
ea6c36e204 Make sure the where.c query planner never reports that the number of ORDER BY 
terms that are satisfied by indices is negative.

FossilOrigin-Name: b186d8d15a10d5e8fcae9ae72e8624d71831f5bd
 2014-03-19 14:30:55 +00:00
drh
079a307259 First attempt at getting block-sort to work. This is an incremental check-in. 
There are many problems still to be worked out.

FossilOrigin-Name: 59742dd4c5259883850044d0938248b009ebd045
 2014-03-19 14:10:55 +00:00
drh
ddba0c227e Make the partial-ORDER-BY information in the query planner available to the 
SELECT code generator.  Still doesn't make a difference in the generated code.

FossilOrigin-Name: e258df236b7de70087c8227cb209080e55b9bf9c
 2014-03-18 20:33:42 +00:00
drh
d2de861cbe Adjust the query planner to keep track of the number of ORDER BY terms 
satisfied.  Still doesn't do anything with this information.  Some tests
fail after this check-in, but all failures are believed to be benign.  The
failures will be addressed at a later stage.

FossilOrigin-Name: 59d49b7fc49fa290e04a02653e7268c85836b27e
 2014-03-18 18:59:07 +00:00
drh
0401acec91 Experiments with the optimization of ORDER BY and GROUP BY clauses. 
FossilOrigin-Name: b150902579d708b454efd5f8750e26a816f7f1a6
 2014-03-18 15:30:27 +00:00
drh
89212fb9f9 Adjustments to the cost computation for the skip-scan query plan, to take 
into account the fact that a seek has to occur on each skip.

FossilOrigin-Name: 0769eebd028ce31375cf93509a1d3687f7b117eb
 2014-03-10 20:12:31 +00:00
dan
0df163a9f0 Remove a branch that is never taken from where.c. 
FossilOrigin-Name: 4a4997221f3d61c1411a993053b40c787beea736
 2014-03-06 12:36:26 +00:00
dan
900defa07a Merge latest trunk changes. 
FossilOrigin-Name: e00ed717fbe456010ec6c746490d7c3e9d94ec5a
 2014-03-03 14:45:06 +00:00
dan
fbf0f0e1f6 Fix a segfault that can occur following an OOM error. 
FossilOrigin-Name: 7fdd378d54754a3ffdc01c6c0a66cf6d5899a495
 2014-03-03 14:20:30 +00:00
dan
3833e934d3 Remove the vdbeRecordCompareLargeHeader function. Fix some other details. 
FossilOrigin-Name: 3861e853105cb8da344c7eebd2e455622b26395e
 2014-03-01 19:44:56 +00:00
drh
434a93147c Improved handling of constants and especially constant functions in the 
ORDER BY clause of a query.  Do not optimize out "ORDER BY random()".
Fix for ticket [65bdeb9739605cc2296].

FossilOrigin-Name: dca1945aeb3fb005263f9be00ee8e72b966ae303
 2014-02-26 02:26:09 +00:00
drh
0baa035a1e Do not allow temporary registers to be in use across an OP_Yield within a 
co-routine.  Fix for ticket [8c63ff0eca81a9132d8].

FossilOrigin-Name: 97a8c9733cba97c78e979dfd5c66610c23e90288
 2014-02-25 21:55:16 +00:00
drh
7d1761059b Add VdbeCoverage() and VdbeCoverageIf() macros for improved VDBE coverage 
testing.

FossilOrigin-Name: b92d31a97d5fe4606d9ae1393c7f3e052f46bf5a
 2014-02-18 03:07:12 +00:00
drh
688852ab15 Add logic to do test coverage measurements on the VDBE code. 
FossilOrigin-Name: ce184c7bb16988641d37c908d9b3042456d4be3d
 2014-02-17 22:40:43 +00:00
drh
cfc6ca4179 Seek past NULLs in a top-constrained search. Avoid checking for NULLs in 
the body of the search.

FossilOrigin-Name: e07a32f30862acf3b322d4d8deb015846d6f8f5f
 2014-02-14 23:49:13 +00:00
drh
f78da0e6af Reduce the number of cases where it is necessary to check for NULL after 
the loop terminating condition.

FossilOrigin-Name: 3c1ae447dec8fc2af1c5105134061717594ac0e0
 2014-02-14 20:59:53 +00:00
drh
4a1d365903 Add OP_IdxGT and OP_IdxLE as distinct opcodes. Formerly these operations where 
done using OP_IdxGE and OP_IdxLT with the P5 flag set.  But VDBE code is easier
to read with distinct opcode names.  Also change OP_SeekGe to OP_SeekGE, and
so forth, so that the capitalization is consistent.  The whole point of this
change is to improve the readability of VDBE listings.

FossilOrigin-Name: b6bea903ac8e1717ed50b221d73bd0be061c7663
 2014-02-14 15:13:36 +00:00
drh
7c3280649a Make sure that virtual WHERE-clause terms do not get transformed into real 
terms when processing set of OR-connected terms.
Fix for ticket [4c86b126f22ad].

FossilOrigin-Name: c950d6c4117d076f871518e738cdf9e8c46a19fc
 2014-02-11 01:50:29 +00:00
drh
5f61229504 Do away with the "multi-register pseudo-table" abstration. Instead, just 
use an OP_SCopy to load results directory from the result registers of
the co-routine.

FossilOrigin-Name: 1e64dd782a126f48d78c43a664844a41d0e6334e
 2014-02-08 23:20:32 +00:00
drh
725de29a2d Tweaks to the generated VDBE code to make it a little easier to follow. 
FossilOrigin-Name: 129217ee91782ec77ff82661753ae5bee8ca99d0
 2014-02-08 13:12:19 +00:00
drh
aceb31b120 Change the OP_Trace opcode to OP_Init and give it the ability to jump to the 
initialization code at the bottom of the program, thus avoiding the need for
an extra OP_Goto.

FossilOrigin-Name: 192dea97316144f15f6dd0eabff08a0bf9ef203e
 2014-02-08 01:40:27 +00:00
drh
ed71a839fd Change the OP_InitCoroutine instruction to jump over the co-routine 
implementation.

FossilOrigin-Name: a522f364a6b8ca6f69c353b30609a2166f6e94cf
 2014-02-07 19:18:10 +00:00
drh
81cf13ec7b Get rid of the OP_Undef and OP_IsUndef opcodes in favor of higher-level 
OP_InitCoroutine and OP_EndCoroutine.

FossilOrigin-Name: 1ec0e9dd4b26d9f597adc8e062317d4866c5a6a6
 2014-02-07 18:27:53 +00:00
drh
e39a732ce2 Provide hints to the btree layer Next and Previous primitives to let them 
know if they can be no-ops if the underlying index is unique.

FossilOrigin-Name: 6c643e45c274e755dc5a1a65673df79261c774be
 2014-02-03 14:04:11 +00:00
dan
41028151be Fix a typo in a comment. No changes to code or tests. 
FossilOrigin-Name: cceacc0e79c4e54682daddf2056c6bb8e88d9484
 2014-01-22 10:22:25 +00:00
drh
340309fd69 Remove an unnecessary parameter from selectInnerLoop(). Clean up comments. 
FossilOrigin-Name: 5e6c4a55f6df30da9dbaa8170f3223613cc86f65
 2014-01-22 00:23:49 +00:00
drh
e73f059093 Change the recursive common table expression algorithm to use a queue instead 
of a pair of tables.  Runs about 25% faster on the sudoku solver query. 
The OP_SwapCursors opcode is no longer required.  The current implementation
uses just a fifo, but the plan is to change it into a queue that will support 
ORDER BY and LIMIT in a recursive query.

FossilOrigin-Name: b2671e1133d2f1fbd36e7cd4b86d6cc7b528aa97
 2014-01-21 22:25:45 +00:00
dan
a4ff825095 In where.c, do not allocate space in sqlite3_index_info structures for the internal WHERE clause "terms" generated to record column equivalencies. 
FossilOrigin-Name: 7d9e22187daaa3160b875a1df17b924969bf718e
 2014-01-20 19:55:33 +00:00
dan
718569443d Add support for common table expressions (WITH clauses). 
FossilOrigin-Name: 0171e3bb4f663a9414b0e8b64c87b5d0683855b5
 2014-01-17 15:15:10 +00:00
dan
eae73fbfb9 Allow only a single recursive reference in a recursive CTE. Also require that this reference is not part of a sub-query. 
FossilOrigin-Name: a296b73360d34c9364eceb2cc09a9a92adc4abb8
 2014-01-16 18:34:33 +00:00
drh
6ade453cd8 Always use available indices to optimize LIKE operators even if the pattern 
of the LIKE operator has a COLLATE modifier.  This fixes an ineffiency that
was introduced into 3.7.15 by check-in [8542e6180d4] on 2012-12-08.

FossilOrigin-Name: 16bd54783a3f5531c55564ddefdada657c078eb0
 2014-01-16 15:31:41 +00:00
dan
eede6a538d Fixes so that SQLITE_OMIT_CTE builds work. 
FossilOrigin-Name: 3908e2ea2e7e5f466cbbbffdc27e0fe8dc9751ac
 2014-01-15 19:42:23 +00:00
dan
62ba4e418d Disable automatic indices on recursive CTE references. 
FossilOrigin-Name: 28aa6db8c878655255dbfb618f8d65be78e3d7e5
 2014-01-15 18:21:41 +00:00
dan
8ce7184bc2 Add code to handle recursive CTEs. 
FossilOrigin-Name: a5c2a54a07d35166911abc792008c05dea897742
 2014-01-14 20:14:09 +00:00
drh
1c2c0b776f Avoid redundant register loads during index key generation when doing a 
DELETE or INTEGRITY_CHECK on a table with multiple indices.

FossilOrigin-Name: 8f6e6149a165f516be6395fd753e163d52ffd52e
 2014-01-04 19:27:05 +00:00
drh
759e858811 Try to factor constant subcomponents of the WHERE clause out of the loop. 
FossilOrigin-Name: 9d05777fe24e1a5ce71762de38db840931ef0bc8
 2014-01-02 21:05:10 +00:00
drh
6c1de308f2 Make sure the WhereLoop.aLTerm[] array is large enough when processing 
the skip-scan optimization.  Fix for ticket [520070ec7fbaac].

FossilOrigin-Name: 46d040591f27be01b1860344f8a268797fe344f4
 2013-12-22 20:44:10 +00:00
drh
a6353a3f64 Performance optimizations for sqlite3VXPrintf(). 
FossilOrigin-Name: 9227ad48e1612b32a3a3e9551c49890f93abc0a7
 2013-12-09 19:03:26 +00:00
drh
7f59475fda Remove a branch in STAT4 logic that is no longer reachable after 
the previous change.

FossilOrigin-Name: eca7d3f1612c7a009a9e4ef89f76f9b7e275d1e6
 2013-12-03 19:49:55 +00:00
drh
c964c39fb0 Lower the threshold for using skip-scan from 50 to 18, based on experiments 
that show that 18 is the approximate break-even point for a variety of
schemas.

FossilOrigin-Name: 83c0bb9913838d18ba355033afde6e38b4690842
 2013-11-27 04:22:27 +00:00
drh
f93cd949a0 Performance optimization to the OP_Next and OP_Prev opcodes. 
FossilOrigin-Name: ecaac28a2e78aca148fc614fe54bf2706aed8be2
 2013-11-21 03:12:25 +00:00
drh
6bc69a2d4b Change Noop-comments in where.c into Module-comments, so that they are 
omitting without SQLITE_ENABLE_MODULE_COMMENTS.

FossilOrigin-Name: 3e577f40183c56e60866d8382b044688a1b77eaf
 2013-11-19 12:33:23 +00:00
drh
64ff26f741 Add comments identifing where the skip-scan option is decided in the 
query planner, to aid in tuning that decision.  No changes to code.

FossilOrigin-Name: e9df04cec48bb8b4ea26ec9024a22ea42b2338eb
 2013-11-18 19:32:15 +00:00
drh
64bbbf3383 Avoid unnecessary OP_IfNull checks when doing a range query where there 
is a constraint on the lower bound of the range.

FossilOrigin-Name: de08a7e7abbad9b94d0268d096ef4555d31c8b0c
 2013-11-16 14:03:53 +00:00
drh
c2acc4e466 Changes to make the new constant expression factoring logic more general 
and more testable.

FossilOrigin-Name: d10fb49a92f5f6e93093ae83544e5aec7984361a
 2013-11-15 18:15:19 +00:00