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f52bb8d385
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23 Commits

Author SHA1 Message Date
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