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1577 Commits

Author SHA1 Message Date
drh
6d6decb8d9 Only choose to scan an IN operator rather than use an index if we have 
real STAT1 data to suggest it is advantageous.

FossilOrigin-Name: 30e874661dcc1a2ecb40df2ef74582151d85bb36c754a38548829a3b6285f18d
 2018-06-08 21:21:01 +00:00
drh
da4c409aea 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.

FossilOrigin-Name: 1fa40a78fef4516c39b217bff67efe7e7d2077cca00aae0ef5c2c9cff94f008b
 2018-06-08 18:22:10 +00:00
drh
f1949b6634 Remove the NextIfOpen and PrevIfOpen opcodes which are no longer needed 
when the IN-early-out optimization is working.

FossilOrigin-Name: 439c8162272795b422a0e01b01b832fbc12b39914c9632a674162af8bdecff98
 2018-06-07 17:32:59 +00:00
drh
f7b0a5f3c3 Add the WHERE_IN_EARLYOUT flag and use it to clarify the logic of this 
optimization.

FossilOrigin-Name: 522f1eacc20f11002cad58232a7c2610f369568653510e54f46088f579f778dc
 2018-06-07 14:59:22 +00:00
drh
8c2b6d784b 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.

FossilOrigin-Name: 6bf251af4347165a470d39457d61ab6d2a06c206db8f30bd8be5dbb388ae8a5b
 2018-06-05 20:45:20 +00:00
drh
86d0ea7558 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.

FossilOrigin-Name: 87a9fc504f9a78caf7a7949cc7ada0a19d61bfab51bb49a00a1607194c116212
 2018-06-05 15:16:25 +00:00
drh
a0368d9396 Demonstration code on a possible technique for optimizing the use of IN 
operator on columns to the right of multicolumn indexes.  If the OP_Noop
generated where were really a new opcode that checked to see if there existed
any entries in the index with a matching prefix, it might prevent unnecessary
iterations of the IN operator.

FossilOrigin-Name: 92f0fe155d5546fc7f4a443d0630613dabe149061966308e5420fad652278f16
 2018-05-30 00:54:23 +00:00
drh
492ad131bd Make more aggressive use of automatic indexes when processing materalized 
views and subqueries.

FossilOrigin-Name: 172f5bd27e47cbdaaab54fe4383a5ee505d285257af6153ed626d9493a4adab3
 2018-05-14 22:46:11 +00:00
drh
e2188f0b0f Fix harmless compiler warnings associated with the new EXPLAIN QUERY PLAN logic. 
FossilOrigin-Name: 374d8e264487b0437a8d995ced1bc026a92d495a2d0568f65f033e9ebe11d0e2
 2018-05-07 11:37:34 +00:00
drh
fa16f5d9d6 Enhance EXPLAIN QUERY PLAN to report the generation of constant rows using 
VALUES or just a SELECT without FROM.

FossilOrigin-Name: c75eee69fa8a9b56ee58a4cc539e80cc982f43390dc3a357344d58479dd89a41
 2018-05-03 01:37:13 +00:00
drh
b3f0276b9e Fix test cases so that they work with the new EXPLAIN QUERY PLAN output 
format.  Only some of the cases have been fixed.  This is an incremental
check-in.

FossilOrigin-Name: 5f0e803e33aa557865d5fc830d9202d628de9a94c9757058ca48f1a560702cd3
 2018-05-02 18:00:17 +00:00
drh
84a01debf9 Improved EQP output for recursive CTEs and multi-value VALUES clauses. 
FossilOrigin-Name: f2f525548c65f89f55cbe91da8a21512dedc6f7b68b58b7906d653e800a2963a
 2018-05-02 16:13:48 +00:00
drh
c447595df5 Do not attempt to use terms from the WHERE clause to drive indexes on the 
right table of a LEFT JOIN.  Fix for ticket [4ba5abf65c5b0f9a96a7a40cd18b]

FossilOrigin-Name: aeb694e3f787f1f8b55650c17f90c197eee3f7f9b890a88f458c33e43009a082
 2018-04-24 17:34:03 +00:00
drh
337679be4e Enhance the query planner so that it detects when the xBestIndex method 
of a virtual table gives out-of-sequence argvIndex values and reports an
error.  Secondary fix for ticket [2b8aed9f7c9e6].

FossilOrigin-Name: 9506ec14fb9e58986c1b79a3ca78430ad94b10966944c864e0429a7688dd1454
 2018-04-09 15:57:54 +00:00
drh
0f1631db06 Improvements to ".wheretrace" output. 
FossilOrigin-Name: ea2e5b34bf35ade602dfcef359b64f810674f304fda14326b7f2dedefcc5f340
 2018-04-09 13:58:20 +00:00
dan
4ea48144f9 Fix a failing assert() in the new code on this branch. 
FossilOrigin-Name: 74d857d178dfadea7e07ba47439fe11aa9d282b54caf78cd6961e593b37406d0
 2018-01-31 14:07:01 +00:00
dan
8433e7166b Update the omit-left-join optimization so that it works in some cases when the 
RHS is subject to a UNIQUE but not NOT NULL constraint.

FossilOrigin-Name: 88411a402b29f19d69e0d06d9099eabb98c238ddb7c07ce110236316f008753e
 2018-01-29 17:08:52 +00:00
drh
33f10207aa Proposed fix for the query planner problem of ticket 
[ec32177c99ccac2b1].

FossilOrigin-Name: eef8cbef3c49e6331301a8f3f8a5fd12090b1e99e68487c2d405e53ef771f688
 2018-01-27 05:40:10 +00:00
dan
0c2ba13e02 Fix a problem causing an infinite loop or other malfunction in some UPDATE 
statements with an OR term in the WHERE clause.

FossilOrigin-Name: feb2c2b6f66b0f45490beb1642d99cdb89fa220e299a8c118929df557c814189
 2018-01-16 13:37:43 +00:00
drh
092457b18c Change the function name to sqlite_unsupported_offset(X). Only enable the 
function if compiled with -DSQLITE_ENABLE_OFFSET_SQL_FUNC.  The makefiles add
that definition to shell builds.

FossilOrigin-Name: 7a7f826e324b1a2c332e2f1d0740fd0babffcaca6275a798572f02ad367b99ab
 2017-12-29 15:04:49 +00:00
drh
fe6d20e9f4 Enhance location(X) so that it works with indexes and WITHOUT ROWID tables. 
The function might return an offset to the main table or to an index,
depending on whether the column X would be loaded from the main table or
from the index.

FossilOrigin-Name: dd94d6a880dfec4bddd247239b815b84964f804d24841e25f33f1d46a4b5274d
 2017-12-29 14:33:54 +00:00
drh
efc88d020c Modify the new sqlite3_vtab_collation() interface so that it takes a 
pointer to the sqlite3_index_info object passed into xBestIndex rather than
an sqlite3 connection pointer, which the xBestIndex method might not have
access to.

FossilOrigin-Name: 5c1fe6666019147a26480b5db1bf2f474a5d072c234c736f16ed5d2a9a040b3f
 2017-12-22 00:52:50 +00:00
dan
e42e1bc594 Fix crash in sqlite3_vtab_collation() when called for an IS NOT NULL 
constraint.

FossilOrigin-Name: ad38d2c4f073705c02c7b38675e8ae86fe4a794d54eb796e7ed51a905824d5f5
 2017-12-19 18:56:28 +00:00
dan
11546779b7 Merge latest trunk changes into this branch. 
FossilOrigin-Name: d5b597b52a1213cdf382d96f4df3535727be0852b25bafd12bbef54da946c5f2
 2017-12-16 19:16:24 +00:00
drh
7e8515d8be The query planner tries to avoids using indexes that use unknown collating 
functions.

FossilOrigin-Name: 02013fc120bf71a8be3550c696a588af8c92f2209f8e5db530624878ddc8aa7e
 2017-12-08 19:37:04 +00:00
drh
b7571b4ecb When doing a table scan using an index, do not error out if collating 
functions used by that index are unavailable, since they will not be used.

FossilOrigin-Name: bbd69fa6fa7f3c86fb5cd1b69e1abbe1bbad61aa281e6c073a402d1b202e42ec
 2017-12-07 22:10:16 +00:00
dan
3d9c7c3a4f Merge latest trunk changes into this branch. 
FossilOrigin-Name: 373fa21bffd37053bb1a741d3ace2f003a5639bf373c20ea7bb24a31080888b3
 2017-11-29 16:16:29 +00:00
drh
53bf7175af Fix a problem in the omit-table-from-left-join optimization 
from check-in [0cd82ee9a8413cf] that was discovered by OSSFuzz.

FossilOrigin-Name: b016c28fa5617a20ad34c005372e738d28f7fc4388d19ee0cb7add4ed19d74aa
 2017-11-23 04:45:35 +00:00
drh
fa337cc115 Completely disable the skip-ahead-distinct optimization for all but the 
inner-most loop of a DISTINCT join.  Fix for ticket [ef9318757b152e3a26e9592]

FossilOrigin-Name: b7595cf2cadcba486e60b3c230ccc412a7cf449c1d56cbe65869e6d5d9f1374d
 2017-11-23 00:45:21 +00:00
drh
065b34f6e5 Fix the skip-ahead-distinct optimization on joins for cases there the table 
in the inner loop of the join does not contribute any columns to the
result set.  Proposed fix for ticket [ef9318757b152e3a2]

FossilOrigin-Name: 2dcef5a9ae7f347da65207bf6bf612fb12e18e1a6704799322f0cf2a86154cfd
 2017-11-21 23:38:48 +00:00
dan
41203c6cf1 Update the omit-table-from-left-join optimization so that it can omit tables 
from the middle of the join as well as the end.

FossilOrigin-Name: 618ca9fe53d8d2d7b4f368e6ee404d5fceeecac0d689f32ab62af8a6cbb37401
 2017-11-21 19:22:45 +00:00
dan
75dbf68b5b Fix a problem preventing the planner from identifying scans that visit at most 
one row in cases where that property is guaranteed by a unique, not-null,
non-IPK column that is the leftmost in its table.

FossilOrigin-Name: 299d7ca52fec32f04ffd2b8561dd4b839e891792162f8b00259368683436b02d
 2017-11-20 14:40:03 +00:00
dan
85e1f46eb9 Fix a problem causing an INDEXED BY specifying an unusable partial index to be 
mishandled.

FossilOrigin-Name: 292a04086a902634fc514b379a2b245eb2681c1b84d9bb950b6ecb9aab28b468
 2017-11-07 18:20:15 +00:00
drh
9d9c41e25e Remove unnecessary NEVER() and ALWAYS() conditionals. 
FossilOrigin-Name: 1c80c75d4be2f3d44fb18bb4c07eccac2aba79b688215a741317dfc47dc7c2ce
 2017-10-31 03:40:15 +00:00
drh
989d7278b0 Improved comments, including a typo fix, on the whereLoopCheaperProperSubset() 
function.

FossilOrigin-Name: 700a3c694438ca6cca185d0097f24799e82717ef38cb47bd83666c80f0e3cb2f
 2017-10-16 11:50:12 +00:00
drh
47b1d68f25 In the query planner, do not consider index X to be a proper subset of 
index Y if X is a covering index but Y is not.

FossilOrigin-Name: ee31c04353cd75ea4bbadee2994c30d3808b696a4f680187502d104902988a5d
 2017-10-15 22:16:25 +00:00
dan
4fa5cb3598 Update this branch to match latest trunk. 
FossilOrigin-Name: d325da6c50f2f9c10f50b3839f87c155876c339879bb8bdb82567b5ff34ef7ba
 2017-10-12 14:13:31 +00:00
dan
518e3f0673 Merge latest trunk changes with this branch. 
FossilOrigin-Name: 2719cf5c5bbe8e31d18368d54d968af3878ad2e15f0666e18d7b567d7439c451
 2017-10-11 20:26:07 +00:00
drh
70efa84da7 Add new routines to simplify dealing with collating sequences in expressions: 
sqlite3ExprNNCollSeq() and sqlite3ExprCollSeqMatch().

FossilOrigin-Name: 490e488ea963fe725b16212822c8608f2b6abce688931b611446bc2cbfe6b87c
 2017-09-28 01:58:23 +00:00
drh
db8e68b4cd Indexes on expressions with a COLLATE clause are able to satisfy an ORDER BY 
with the same COLLATE clause.

FossilOrigin-Name: 0413001843dce7c63659d39b329ca14cdcd54f4407922f51b2fb7659572a733e
 2017-09-28 01:09:42 +00:00
drh
488e619192 In two places, change the magic number -1 to its proper symbol XN_ROWID. 
FossilOrigin-Name: 80277d2fc9b76fe41e345d00952da1528e69884f25911cf6e4f78b09ff778421
 2017-09-28 00:01:36 +00:00
drh
154896e8d2 Fix a harmless comment typo. No changes to code. 
FossilOrigin-Name: f7f0bf1da03f7fc1647ef172d9cb71a2ac46f136d4dee8e3a24e39313a981eb5
 2017-09-15 14:36:13 +00:00
drh
303a69b5ad Refactor names of constants and functions associated with the auxiliary 
operators for xBestIndex.

FossilOrigin-Name: 0fb992af669e765760a94d2b6e2330b21a98f39f18445a94b0a2290560368d58
 2017-09-11 19:47:37 +00:00
drh
33892c11a7 Minor adjustments to indentation and spacing for clarity. No changes to code. 
FossilOrigin-Name: d3153abda6fd48015b007081734738b9cc4622e3564dc78a7a470a72dc2ca236
 2017-09-11 18:37:44 +00:00
dan
d03024d814 Enhance the vtab interface to handle IS, !=, IS NOT, IS NULL and IS NOT NULL 
constraints.

FossilOrigin-Name: 34c8e952616013deb6fffec701ac5989afac9bef1bf92458a2e4ba92c7ee924f
 2017-09-09 19:41:12 +00:00
drh
7e6f980bd4 Proposed fix for ticket [b899b6042f97f5] 
FossilOrigin-Name: c7f9f47b239fdd99b555fb0a31eb82b22dbe6c821f1612d67a0d6a822288d9f7
 2017-09-04 00:33:04 +00:00
drh
83e8ca54d1 Small performance optimization in sqlite3WhereBegin(). 
FossilOrigin-Name: 39f708d1e286931365a8992dbe7f900108ff1dad146032a284ad1dec09b11e06
 2017-08-25 13:34:18 +00:00
dan
62f6f51ae1 Only use indexes on expressions to optimize ORDER BY and GROUP BY if the 
collation sequence matches. Possible fix for [e20dd54a].

FossilOrigin-Name: 37e1900880b70be6802eaf43b0e568fda709a1dd6083d8be11e5a7a7d1fda41a
 2017-08-18 08:29:37 +00:00
dan
bbccd52143 Avoid creating an automatic index on the RHS of a LEFT JOIN to optimize an IS 
term. Fix for [ce68383b].

FossilOrigin-Name: d2f0b2e859a8a413ee4e4bd7040e450ccd604069e4ea8dbc9ff924718c2b14d7
 2017-07-18 17:13:41 +00:00
drh
269ba80469 Add the count-of-view optimization when compiled using 
SQLITE_COUNTOFVIEW_OPTIMIZATION.

FossilOrigin-Name: d1ba200234f40b84327c7fc28c2584ed069da80e97578df71114d1a9ba9c559c
 2017-07-04 19:34:36 +00:00