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Commit 4d58a7ca authored by Tom Lane's avatar Tom Lane
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Optimizer can now estimate selectivity of IS NULL, IS NOT NULL,

IS TRUE, etc, with some degree of verisimilitude.  Split out
selectivity support functions from builtins.h into a new header
file selfuncs.h, so as to reduce the number of header files builtins.h
must depend on.  Fix a few missing inclusions exposed thereby.
From Joe Conway, with some kibitzing from Tom Lane.
parent c31545af
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