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Fully update git head, and update back branches in ./COPYRIGHT and
legal.sgml files.
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Not sure how we missed this case, but we did. Per bug #7551 from
Diego de Lima.
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commit-fest.
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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.
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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
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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
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