Tom Lane 0e5e167aae Collect and use element-frequency statistics for arrays. ... This patch improves selectivity estimation for the array <@, &&, and @> (containment and overlaps) operators. It enables collection of statistics about individual array element values by ANALYZE, and introduces operator-specific estimators that use these stats. In addition, ScalarArrayOpExpr constructs of the forms "const = ANY/ALL (array_column)" and "const <> ANY/ALL (array_column)" are estimated by treating them as variants of the containment operators. Since we still collect scalar-style stats about the array values as a whole, the pg_stats view is expanded to show both these stats and the array-style stats in separate columns. This creates an incompatible change in how stats for tsvector columns are displayed in pg_stats: the stats about lexemes are now displayed in the array-related columns instead of the original scalar-related columns. There are a few loose ends here, notably that it'd be nice to be able to suppress either the scalar-style stats or the array-element stats for columns for which they're not useful. But the patch is in good enough shape to commit for wider testing. Alexander Korotkov, reviewed by Noah Misch and Nathan Boley		2012-03-03 20:20:57 -05:00
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adt	Collect and use element-frequency statistics for arrays.	2012-03-03 20:20:57 -05:00
cache	Allow LEAKPROOF functions for better performance of security views.	2012-02-13 22:21:14 -05:00
error	Update copyright notices for year 2012.	2012-01-01 18:01:58 -05:00
fmgr	Update copyright notices for year 2012.	2012-01-01 18:01:58 -05:00
hash	Move CRC tables to libpgport, and provide them in a separate include file.	2012-02-28 19:53:39 -05:00
init	Make superuser imply replication privilege. The idea of a privilege that	2012-01-14 18:22:16 +02:00
mb	Update copyright notices for year 2012.	2012-01-01 18:01:58 -05:00
misc	Add const qualifiers where they are accidentally cast away	2012-02-28 12:42:08 +02:00
mmgr	Run a portal's cleanup hook immediately when pushing it to FAILED state.	2012-02-15 16:19:01 -05:00
resowner	Update copyright notices for year 2012.	2012-01-01 18:01:58 -05:00
sort	Fix VPATH builds, broken by my recent commit to speed up tuplesorting.	2012-02-15 15:53:53 -05:00
time	Update copyright notices for year 2012.	2012-01-01 18:01:58 -05:00
.gitignore	Avoid maintaining three separate copies of the error codes list.	2011-02-03 22:32:49 -05:00
errcodes.txt	Update copyright notices for year 2012.	2012-01-01 18:01:58 -05:00
Gen_dummy_probes.sed	Update copyright notices for year 2012.	2012-01-01 18:01:58 -05:00
Gen_fmgrtab.pl	Update copyright notices for year 2012.	2012-01-01 18:01:58 -05:00
generate-errcodes.pl	Update copyright notices for year 2012.	2012-01-01 18:01:58 -05:00
Makefile	Make handling of errcodes.h more consistent with other generated headers.	2011-02-04 09:29:10 -05:00
probes.d	Make group commit more effective.	2012-01-30 16:53:48 +02:00