pgsql: Teach find_nonnullable_rels to handle OR cases: if every arm of

From: tgl(at)postgresql(dot)org (Tom Lane)
To: pgsql-committers(at)postgresql(dot)org
Subject: pgsql: Teach find_nonnullable_rels to handle OR cases: if every arm of
Date: 2007-02-16 23:32:08
Message-ID: 20070216233208.89BEA9FB48D@postgresql.org
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Log Message:
-----------
Teach find_nonnullable_rels to handle OR cases: if every arm of an OR
forces a particular relation nonnullable, then we can say that the OR does.
This is worth a little extra trouble since it may allow reduction of
outer joins to plain joins.

Modified Files:
--------------
pgsql/src/backend/optimizer/util:
clauses.c (r1.233 -> r1.234)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/clauses.c.diff?r1=1.233&r2=1.234)

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