Tom Lane b62f94c603 Allow simplification of EXISTS() subqueries containing LIMIT. ... The locution "EXISTS(SELECT ... LIMIT 1)" seems to be rather common among people who don't realize that the database already performs optimizations equivalent to putting LIMIT 1 in the sub-select. Unfortunately, this was actually making things worse, because it prevented us from optimizing such EXISTS clauses into semi or anti joins. Teach simplify_EXISTS_query() to suppress constant-positive LIMIT clauses. That fixes the semi/anti-join case, and may help marginally even for cases that have to be left as sub-SELECTs. Marti Raudsepp, reviewed by David Rowley		2014-11-22 19:12:38 -05:00
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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	Add configure --enable-tap-tests option	2014-11-02 09:17:26 -05:00
regress	Allow simplification of EXISTS() subqueries containing LIMIT.	2014-11-22 19:12:38 -05:00
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