mirrors/sqlite
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
22,483 Commits 1,487 Branches 166 Tags 416 MiB
678f3b33cc
Commit Graph

31 Commits

Author SHA1 Message Date
drh
094afffaec Improve the query planner so that it is better able to find full 
index scan plan when there is an INDEXED BY clause.

FossilOrigin-Name: d901837fea1ed54de43ad59eb47c02cbfd2eb215fc57317b5ea8c22a7df947c4
 2020-06-03 03:00:09 +00:00
drh
175b8f06f7 Remove support for STAT3. The sqlite_stat3 tables are ignored, if they 
exist.  STAT4 continues to work as it always has, and as it is a superset of
STAT3 is the recommended replacement.

FossilOrigin-Name: 1e17ea2fd1df4ad49138c787c8fe3207dd0c25c93f9001d52a9b69f8c12e841c
 2019-08-08 15:24:17 +00:00
drh
bd462bcc10 Improvements to EXPLAIN QUERY PLAN formatting. The MULTI-INDEX OR now shows 
a separate "INDEX" subtree for each index.  SCALAR SUBQUERY entries provide
a subquery number that is related back to the .selecttrace output.

FossilOrigin-Name: 7153552bac51295c56a1c42ca79d57195851e232509f9e9610375692f48c7e86
 2018-12-24 20:21:06 +00:00
drh
5d72d9245d Make a separate limb in the EXPLAIN QUERY PLAN output for the various lines 
associated with the OR-optimization.

FossilOrigin-Name: 75ac7b4e4fd0811ca80c719badacff207e0bbd00ac64dde3b3d4ec676fad472d
 2018-05-04 00:39:43 +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
dan
299b24688a Fix where9.test so that it works with the "no_optimization" permutation. 
FossilOrigin-Name: d46adf9d8f741838b9c30f915231d6a3986c3591
 2014-08-12 20:13:22 +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
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
f52bb8d385 Begin adding experimental sqlite_stat4 table. This commit is buggy. 
FossilOrigin-Name: 2beea303a1d609cd2ff252412c50b966b9e5e8f1
 2013-08-03 20:24:58 +00:00
drh
74f91d4462 Add in the cost of doing a table lookup on OR searches. Make test case 
changes to deal with difference in STAT3 behavior.

FossilOrigin-Name: d97898e8e3990ae8c1882c9102b57692d8810730
 2013-06-19 18:01:44 +00:00
drh
fd5874d23d Add the "queryplanner" test permutation. Continuing refinements to NGQP. 
FossilOrigin-Name: 25e2cde105a19293bdb9c001b48624e5d7f8c4e5
 2013-06-12 14:52:39 +00:00
drh
5822d6feb2 Fix test cases for the new EXPLAIN QUERY PLAN format. Add the 
wherecosttest tool.  Other fixes to logarithm cost.

FossilOrigin-Name: aa580e368e3c398b8377b80342dfdd906324c248
 2013-06-10 23:30:09 +00:00
drh
b3129fa560 Do not move WHERE clause terms inside OR expressions that are contained 
within an ON clause of a LEFT JOIN.  Fix for ticket [f2369304e47167e3e].

FossilOrigin-Name: 1128575d0ab24f7023a0f6e6ce4828b9a09a7c6c
 2013-05-09 14:20:11 +00:00
drh
832ee3d4cc Optimize the degenerate case of a FROM clause table name enclosed all by 
itself inside parentheses.  Generate code as if the parentheses did not
exist, rather than the old behavior of manifesting the parenthesized table
into a transient table.  Also, tag every FROM-clause SELECT subquery that is
generated by a parenthesized FROM-clause expression using the SF_NestedFrom
flag.  The new SF_NestedFrom flag is not yet used for anything.

FossilOrigin-Name: 7fecced466d86a66b0b751c5b5608141e134fe2d
 2012-12-18 19:36:11 +00:00
drh
3f4d1d1b02 Attempt to use a covering index even on a full table scan, under the theory 
that the index will be smaller and require less disk I/O and thus be faster.

FossilOrigin-Name: cfaa7bc12847a7006ccc93815f2395ad5259744a
 2012-09-15 18:45:54 +00:00
drh
331b67c151 Candidate fix for the optimizer problem described in ticket 
[b7c8682cc17f3] which can causes a LEFT JOIN to be changed
into a INNER JOIN if there are OR terms in the WHERE clause.

FossilOrigin-Name: 0dc4cb935514131c99172175d57feec3a1743aa9
 2012-03-09 22:02:08 +00:00
dan
2f56da3f26 Changes to various test scripts so that veryquick.test runs with OMIT_COMPOUND_SELECT defined. 
FossilOrigin-Name: 76bb649ee2633226324130f5898622c348f93769
 2012-02-13 10:00:35 +00:00
drh
85ae206e69 More test cases for the OR optimization. 
FossilOrigin-Name: 4997d8b81cd3ea7c708911bfece00020d11224f9
 2011-10-07 16:08:28 +00:00
drh
083310dfcc Change the weighting of binary searches on tables to 1/10th the cost of a 
search on an index.  Change the assumed reduction in search space from a
indexed range constraint from 1/3rd to 1/4th.  Do not let the estimated 
number of rows drop below 1.

FossilOrigin-Name: 4847c6cb71423248b186ab7842b97c83e2f5fefd
 2011-01-28 01:57:41 +00:00
dan
4bc39fa188 Change the EXPLAIN QUERY PLAN output to use "USING INDEX" instead of "BY INDEX", and to use "SEARCH" instead of "SCAN" for loops that are not full-table scans. 
FossilOrigin-Name: 6611b76b0296875fb9903b25dfaa783a9c12eaa1
 2010-11-13 16:42:27 +00:00
dan
acf1987d18 Fix a bug in the EXPLAIN QUERY PLAN code. 
FossilOrigin-Name: 7ae068952fba4395b4aa437613a5ed2bd9ddf941
 2010-11-11 11:43:01 +00:00
dan
47eb16d4ce Modifications to test cases to account for new EXPLAIN QUERY PLAN output. 
FossilOrigin-Name: 30904ef8412348464e893e9e1551ef22cad24a3e
 2010-11-11 10:36:25 +00:00
drh
dda70fe38e Remove leftover "breakpoint" commands from test scripts. Also remove blank 
lines at the end of scripts. (CVS 6721)

FossilOrigin-Name: 1fef16ec2b89981770cf44f606a420fbe031a7a4
 2009-06-05 17:09:11 +00:00
danielk1977
1d46146b58 Attempt to optimize virtual table queries with 'OR' expressions in the WHERE clause. (CVS 6527) 
FossilOrigin-Name: f61e4cd93682fd98bea2a71d346f9eaa68454390
 2009-04-21 09:02:45 +00:00
danielk1977
a55331620e Optimize queries of the form "SELECT count(*) FROM <tbl>" by adding a sqlite3BtreeCount() interface to the btree layer. (CVS 6316) 
FossilOrigin-Name: d4aa6593183224b6868a322511511c0bbf63b598
 2009-02-24 10:01:51 +00:00
danielk1977
e2d7b24d08 Scan an index instead of a table for "SELECT count(*) FROM <tbl>" queries. Because an index is usually smaller than a table on disk, this saves some IO. (CVS 6315) 
FossilOrigin-Name: 294ba6f743c9132dce0e73da480bd3c2071e7239
 2009-02-23 17:33:49 +00:00
drh
103bd88cf7 Increased test coverage in where.c. (CVS 6146) 
FossilOrigin-Name: 1e5725c5179660277c2e8c321877d7ee3ca21808
 2009-01-08 21:00:02 +00:00
drh
171256c45c Increase test coverage of where.c. Make sure OR-optimization works on 
UPDATE and DELETE in addition to SELECT.  (Bug found by coverage tests.) (CVS 6139)

FossilOrigin-Name: 4b2c08e8984befb12fa2173ca89d9f54cf764d22
 2009-01-08 03:11:19 +00:00
drh
04bbcd5ce9 Fix a bug in the multi-index OR cost estimator. Remove leftover "breakpoint" 
commands from test scripts. (CVS 6086)

FossilOrigin-Name: b090d5736d7eaec17a39d3133e1587b1d2a42acb
 2008-12-30 17:55:00 +00:00
drh
eb9441eb06 Add LEFT JOIN test cases for multi-index OR in where9.test. (CVS 6085) 
FossilOrigin-Name: 96f3b62914adde34079f08428b4e2fe81c193612
 2008-12-30 16:35:53 +00:00
drh
46129af9fb Get EXPLAIN QUERY PLAN working with the multi-index OR optimization. 
Added new test script "where9.test". (CVS 6084)

FossilOrigin-Name: 4b6460221011e02bedb724169e8e4793e539e65a
 2008-12-30 16:18:47 +00:00