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1577 Commits

Author SHA1 Message Date
drh
d9e3cad2f8 Progress toward using the iScanRatio information on indices. Many tests 
are still failing.

FossilOrigin-Name: 6c352edbba85a15ca356b5e131f4b3b2723d1774
 2013-10-04 02:36:19 +00:00
drh
24b7fe9004 Fix a minor typo in a comment in where.c. 
FossilOrigin-Name: 9c9fa151e9a3bdab0264c08b66cbcc89d61bfca5
 2013-09-30 19:33:06 +00:00
drh
a4c3c87e3d Merge in the Expr.flags expansion to 32-bits. Use an extra bit to help 
optimize the sqlite3ExprSkipCollate() routine.

FossilOrigin-Name: 4c84d1b4c20f18921dd705bf67e8225975b83e86
 2013-09-12 17:29:25 +00:00
drh
7d9e7d8287 Improvements to likelihood processing so that commuting an unindexed term in 
the WHERE clause does not change the query plan.

FossilOrigin-Name: 6e6bded055cdbc902731687c86d92c39a3ba5904
 2013-09-11 17:39:09 +00:00
drh
09328c00d6 Additional unlikely() test cases. Logic tweaks to support test coverage. 
FossilOrigin-Name: 5d00cce74a7aefaf30022ae971ab1e0451e0ad6e
 2013-09-11 14:34:58 +00:00
drh
abfa6d52ed Tweaks to the index selection logic. 
FossilOrigin-Name: 52d52688644f635a50a60ff17b160f3affa8fa6c
 2013-09-11 03:53:22 +00:00
drh
36fabb6297 Merge trunk fixes into the unlikely-func branch. 
FossilOrigin-Name: a51d751553b14aa26912c516f60727551deb8e60
 2013-09-10 01:53:18 +00:00
drh
0259bc3da2 Make sure that the transitive constraint optimization does not cause 
WHERE clause terms to be disabled prematurely.  We are unable to find a test
case that fails because of this, but it seems prudent to make this
preventative change nevertheless.

FossilOrigin-Name: d6e361d7fb8013d616af91ef2c10038c97d1be5f
 2013-09-09 19:37:46 +00:00
drh
add5ce303f Continuing refinements of the logic to take WHERE clause terms not used for 
indexing into account when computing the number of output rows from each
table.

FossilOrigin-Name: b65dc53415f42d8402d0ec7f4bedf59d7b39b486
 2013-09-07 00:29:06 +00:00
drh
fde1e6bc37 Enhance the plan solver to take into account the number of output rows when 
computing the set of paths to retain for the next cycle.

FossilOrigin-Name: 1a46a7242313da96420985fa52e1de3f84533e5b
 2013-09-06 17:45:42 +00:00
drh
cca9f3d291 Initial implementation of the unlikely() SQL function used as a hint to 
the query planner.

FossilOrigin-Name: 036fc37a034093a4c6fc190633bd41c2b7230d77
 2013-09-06 15:23:29 +00:00
drh
0d31dc37ac Make sure the destination WhereLoop is left in a sane state when an 
OOM fault occurs inside of whereLoopXfer().

FossilOrigin-Name: a99a53b81e29c9514b85318bea028d1667e5f760
 2013-09-06 00:40:59 +00:00
drh
74dade2155 Rearrange the order of conditions in an "if" statement to facilitate testing. 
FossilOrigin-Name: 8462fb43c275a70db59c4339650225deeadeef00
 2013-09-04 18:14:53 +00:00
mistachkin
c2cfb51525 Fix out-of-order variable declaration. Fix harmless compiler warning. 
FossilOrigin-Name: 8df95bb0b3f72222cf262174247a467c234f9939
 2013-09-04 04:04:08 +00:00
drh
fbc38de980 Harden the STAT4 logic in where.c against OOM faults. 
FossilOrigin-Name: 91d2cfbc95c34c0040deb69106bb9f895abb94c0
 2013-09-03 19:26:22 +00:00
drh
67a5ec7b54 Make sure the omit-noop-left-join optimization is not applied if columns 
of the LEFT JOIN are used in the ORDER BY clause.  
Ticket [be84e357c035]

FossilOrigin-Name: 0303d6bc7112e6f810ae1bd75cafc5ffc51f5212
 2013-09-03 14:03:47 +00:00
drh
05db3c7743 Simplify branch coverage testing by interchanging the order of two tests 
in the whereLoopInsert() function.

FossilOrigin-Name: f7079b5365dd6cd8324a4fb23605e81476122ed6
 2013-09-02 20:22:18 +00:00
dan
575ab2f8f6 Fix a problem with using stat4 data to estimate the number of rows scanned by a range constraint on the second or subsequent column of any index where an affinity transformation must be applied to the constraint argument. 
FossilOrigin-Name: c21f58d84859e479a6cc619671a0df48b2f9692e
 2013-09-02 07:16:40 +00:00
drh
e56dd3ad7b Fix comment typos in the where.c module. No code changes. 
FossilOrigin-Name: 1e0b77cf0edf3d26f76d83aa5466e9ec0e60a710
 2013-08-30 17:50:35 +00:00
drh
f46af73720 If the cost of two whereLoop objects is the same in every way except that 
one has fewer expected output rows than the other, then choose the one with
fewer output rows.

FossilOrigin-Name: 79e458ef7acfddbc189163e3e958da529becb130
 2013-08-30 17:35:44 +00:00
dan
8bff07a55f Restore fix [f15591f802], which was accidentally clobbered by the stat4 merge. 
FossilOrigin-Name: d4b6ad3333cc3bad500c2ebf7a6ea552b6762b69
 2013-08-29 14:56:14 +00:00
dan
cd40abb297 Candidate fix for [9f2eb3abac]: Have the whereShortCut() planner ignore indexes with more than four columns. 
FossilOrigin-Name: c1152bdcbb5ac185f743015fff63769effa81b4b
 2013-08-29 10:46:05 +00:00
drh
e4f9b9b7c0 Add the win32-longpath VFS allowing windows filenames up to 32K characters in 
length.  Remove unused code when -DSQLITE_MAX_MMAP_SIZE=0.  Fix some
compiler warnings on windows.

FossilOrigin-Name: 12d0a8859de0a9d823997cfeccc77bd572cb6d13
 2013-08-28 18:18:12 +00:00
drh
d41d39f24d In the query optimizer, when converting BETWEEN and LIKE/GLOB expressions 
into simpler forms for processing, be sure to transfer the LEFT JOIN markings.
Fix for ticket [bc878246eafe0f52c].

FossilOrigin-Name: caab361ebee5f5c3fdafd9b1abe3d1ab7c5b4db9
 2013-08-28 16:27:01 +00:00
mistachkin
f64188910d Fix several harmless compiler warnings. Fix a couple compiler issues with the shell. 
FossilOrigin-Name: 8917e9f9a0802cbfb6f33e2ab1c2f98e4df5babd
 2013-08-28 01:54:12 +00:00
drh
1435a9a126 Adjust ANALYZE for improved test coverage. Use the SQLITE_ENABLE_STAT3_OR_STAT4 
macro (created in sqliteInt.h) to conditionally include code, instead of 
a boolean specifying both macros separately.

FossilOrigin-Name: 67a9a392edd62ef5a5a1ad3010b20a39b285793d
 2013-08-27 23:15:44 +00:00
drh
2f53b90665 Merge the STAT4 capability into trunk. 
FossilOrigin-Name: a32af0abe5fa6d570604fa3534e8230d5b6042fc
 2013-08-26 23:18:06 +00:00
drh
feb56e0e17 Adjust #ifdefs to get SQLITE_OMIT_AUTOMATIC_INDEX and SQLITE_OMIT_PAGER_PRAGMAS 
to build.

FossilOrigin-Name: ed310201628cf79c0f57674ae7478ee6738b1c6e
 2013-08-23 17:33:46 +00:00
drh
cc04afdad0 Defer the creation of automatic indices until the index is actually used. 
FossilOrigin-Name: 0775501acf152dcbf4dd039f4511f3d8c4330d85
 2013-08-22 02:56:28 +00:00
dan
e934e633a5 Fix an invalid assert() in where.c. Also a crash that can occur in the EXPLAIN QUERY PLAN code under obscure circumstances. 
FossilOrigin-Name: ef192abb82c2fc31135f875d7a19908d67c076b0
 2013-08-20 17:14:57 +00:00
drh
d0aa2f3afd Ignore IS NOT NULL and NOT NULL constraints on NOT NULL columns. 
FossilOrigin-Name: e476408e3c5ba5f3ba5e98ff264167c163d72e3f
 2013-08-20 17:00:55 +00:00
dan
2c18788ffa Initialize a variable in fts3_write.c on the grounds that the argument required to show that it does not require initialization with is complicated. Add an assert() to where.c to silence a clang scan-build warning. 
FossilOrigin-Name: d6c4d48a002a6d7057fccc30064ce0b049678f0c
 2013-08-19 19:29:50 +00:00
drh
9e48788e9d Fix a potential reference off the end of an array in the query planner. 
FossilOrigin-Name: f15591f80212dd6d4ed8e0f14be691cd578d4cdf
 2013-08-19 14:19:00 +00:00
drh
77dfd5bb44 Fixes for harmless compiler warnings. 
FossilOrigin-Name: a0d9ca4f07f1dc3a189864f8ed9cdb0b1d791b1a
 2013-08-19 11:15:48 +00:00
drh
0e1f0029c0 Fix valueFromExpr() so that it returns SQLITE_NOMEM following an OOM when 
changing text encodings.  Also fix some asserts to accommodate OOM errors.

FossilOrigin-Name: dc1ccd09c443cebc4731dbe1a0dea84a9ccf6a9b
 2013-08-16 14:49:00 +00:00
dan
8ad169abb4 If ENABLE_STAT3 is defined but ENABLE_STAT4 is not, have ANALYZE create and populate the sqlite_stat3 table instead of sqlite_stat4. 
FossilOrigin-Name: cca8bf4372ab7a0258aa5c9397818415c6cf0abf
 2013-08-12 20:14:04 +00:00
dan
568cd51b79 Fix minor problems caused by adding the rowid to the records in stat4. 
FossilOrigin-Name: 088d1ff94890ada50d43e6a366a58167ec5a8e96
 2013-08-12 09:29:04 +00:00
dan
dd6e1f193e Add the rowid field to the end of sample records stored in the sqlite_stat4 table. 
FossilOrigin-Name: 3a5e8ab7ddbe1d943b35ef329fe4e5a1bfdb0d9d
 2013-08-10 19:08:30 +00:00
dan
b3c02e210f Fix problems in estimating the number of rows visited by a range query using sqlite_stat4 data when the column subject to the range query is not the leftmost of the index. 
FossilOrigin-Name: 9228aaf54dd2700c4f460f94f9c2309407578983
 2013-08-08 19:38:40 +00:00
dan
84c309b6ae Use a binary search instead of a linear scan when comparing a sample key against data from the sqlite_stat4 table. 
FossilOrigin-Name: e50dc30523210ba12324d5d8379503610f13aa34
 2013-08-08 16:17:12 +00:00
dan
ad45ed7414 Fix a segfault in "ALTER TABLE t1 ADD COLUMN b DEFAULT (-+1)". Also an assert() failure that could occur if SQLITE_ENABLE_STAT4 were not defined. 
FossilOrigin-Name: 9fec3e38287067d60874530300fbeb602958c951
 2013-08-08 12:21:32 +00:00
dan
6cb8d76ccb Fix a bug in using stat4 data to estimate the number of rows selected by a range constraint. 
FossilOrigin-Name: f783938ea999731ea073cd2c78e278095f7bea6d
 2013-08-08 11:48:57 +00:00
dan
eea568d68e Replace variable Index.avgEq (average number of rows in keys for which there is no sample in sqlite_stat4) with vector Index.aAvgEq. 
FossilOrigin-Name: 7b70b419c43b2c3b2daf11d833a1d60245bfaef5
 2013-08-07 19:46:15 +00:00
dan
3d40759803 Merge latest trunk changes with this branch. 
FossilOrigin-Name: 08f74c45ecf711a2373af578d44470add9082377
 2013-08-07 18:42:27 +00:00
dan
87cd93215e When estimating the number of rows scanned using data from the sqlite_stat4 table, avoid allocating UnpackedRecord and KeyInfo structures until they are definitely required. 
FossilOrigin-Name: 353950a5269fa439cc3e57b62e16558a84ea2557
 2013-08-07 15:52:41 +00:00
drh
4a6fc3596b Fix typos and add clarification to comments in where.c. No code changes. 
FossilOrigin-Name: f8d8790ede0fcaf6c5b60ac22919c1d97c74e838
 2013-08-07 01:18:38 +00:00
dan
ddc2d6e8f5 Fixes for builds without SQLITE_ENABLE_STAT4. 
FossilOrigin-Name: 84999e27cc0d14b89d9fe024e29d287c69285369
 2013-08-06 20:15:06 +00:00
dan
7a4192358a When possible, use the multi-column samples in sqlite_stat4 to estimate the number of index rows scanned by a query plan. 
FossilOrigin-Name: 2973f5ca736c4a6f13c653d54b6a29d7cae8d0ed
 2013-08-06 20:01:43 +00:00
dan
f52bb8d385 Begin adding experimental sqlite_stat4 table. This commit is buggy. 
FossilOrigin-Name: 2beea303a1d609cd2ff252412c50b966b9e5e8f1
 2013-08-03 20:24:58 +00:00
drh
3975974780 Updates to requirements marks. No code changes. 
FossilOrigin-Name: 213020769f310aec1591d97756b53891d0b64005
 2013-08-02 23:40:45 +00:00