Tom Lane a4523c5aa5 Improve planning of btree index scans using ScalarArrayOpExpr quals. ... Since we taught btree to handle ScalarArrayOpExpr quals natively (commit 9e8da0f757), the planner has always included ScalarArrayOpExpr quals in index conditions if possible. However, if the qual is for a non-first index column, this could result in an inferior plan because we can no longer take advantage of index ordering (cf. commit 807a40c551). It can be better to omit the ScalarArrayOpExpr qual from the index condition and let it be done as a filter, so that the output doesn't need to get sorted. Indeed, this is true for the query introduced as a test case by the latter commit. To fix, restructure get_index_paths and build_index_paths so that we consider paths both with and without ScalarArrayOpExpr quals in non-first index columns. Redesign the API of build_index_paths so that it reports what it found, saving useless second or third calls. Report and patch by Andrew Gierth (though rather heavily modified by me). Back-patch to 9.2 where this code was introduced, since the issue can result in significant performance regressions compared to plans produced by 9.1 and earlier.		2014-10-26 16:12:22 -04:00
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examples	Update copyright for 2014	2014-01-07 16:05:30 -05:00
isolation	Implement SKIP LOCKED for row-level locks	2014-10-07 17:23:34 -03:00
locale	Rename 'gmake' to 'make' in docs and recommended commands	2014-02-12 17:29:19 -05:00
mb	Lots of doc corrections.	2012-04-23 22:43:09 -04:00
performance	Run newly-configured perltidy script on Perl files.	2012-07-04 21:47:49 -04:00
perl	Fix TAP tests with Perl 5.12	2014-10-26 10:26:36 -04:00
regress	Improve planning of btree index scans using ScalarArrayOpExpr quals.	2014-10-26 16:12:22 -04:00
thread	Remove dependency on wsock32.lib in favor of ws2_32	2014-07-15 14:18:39 +02:00
Makefile	Add isolation test to check-world and installcheck-world	2012-03-05 20:19:20 +02:00