Tighten selection of equality and ordering operators for grouping

Tom Lane <tgl@sss.pgh.pa.us>

Commit: f68f11928d5c791873073c882775dae10283ff49
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2002-11-29T21:39:12Z
Releases: 7.4.1
Tighten selection of equality and ordering operators for grouping
operations: make sure we use operators that are compatible, as determined
by a mergejoin link in pg_operator.  Also, add code to planner to ensure
we don't try to use hashed grouping when the grouping operators aren't
marked hashable.

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