drh
083310dfcc
Change the weighting of binary searches on tables to 1/10th the cost of a
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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.
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FossilOrigin-Name: 6611b76b0296875fb9903b25dfaa783a9c12eaa1
2010-11-13 16:42:27 +00:00
dan
acf1987d18
Fix a bug in the EXPLAIN QUERY PLAN code.
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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.
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FossilOrigin-Name: 30904ef8412348464e893e9e1551ef22cad24a3e
2010-11-11 10:36:25 +00:00
drh
dda70fe38e
Remove leftover "breakpoint" commands from test scripts. Also remove blank
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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)
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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)
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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)
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FossilOrigin-Name: 294ba6f743c9132dce0e73da480bd3c2071e7239
2009-02-23 17:33:49 +00:00
drh
103bd88cf7
Increased test coverage in where.c. (CVS 6146)
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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
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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"
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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)
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FossilOrigin-Name: 96f3b62914adde34079f08428b4e2fe81c193612
2008-12-30 16:35:53 +00:00
drh
46129af9fb
Get EXPLAIN QUERY PLAN working with the multi-index OR optimization.
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Added new test script "where9.test". (CVS 6084)
FossilOrigin-Name: 4b6460221011e02bedb724169e8e4793e539e65a
2008-12-30 16:18:47 +00:00
