postgres

Commit Graph

Author	SHA1	Message	Date
Tom Lane	3f828fae62	Fix array_typanalyze to work for domains over arrays. Not sure how we missed this case, but we did. Per bug #7551 from Diego de Lima.	13 years ago
Bruce Momjian	927d61eeff	Run pgindent on 9.2 source tree in preparation for first 9.3 commit-fest.	14 years ago
Robert Haas	85efd5f065	Reduce hash size for compute_array_stats, compute_tsvector_stats. The size is only a hint, but a big hint chews up a lot of memory without apparently improving performance much. Analysis and patch by Noah Misch.	14 years ago
Tom Lane	4fb694aebc	Improve histogram-filling loop in new compute_array_stats() code. Do "frac" arithmetic in int64 to prevent overflow with large statistics targets, and improve the comments so people have some chance of understanding how it works. Alexander Korotkov and Tom Lane	14 years ago
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	14 years ago

5 Commits (b10e9ae9f3ae4f1910085673eab159ff9c8e1080)