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pgsql-server/src/backend/optimizer/util pathnode.c

From: tgl(at)svr1(dot)postgresql(dot)org (Tom Lane)
To: pgsql-committers(at)postgresql(dot)org
Subject: pgsql-server/src/backend/optimizer/util pathnode.c
Date: 2004-01-19 03:49:41
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Lists: pgsql-committers
CVSROOT:	/cvsroot
Module name:	pgsql-server
Changes by:	tgl(at)svr1(dot)postgresql(dot)org	04/01/18 23:49:41

Modified files:
	src/backend/optimizer/util: pathnode.c 

Log message:
	Recognize that IN subqueries return already-unique results if they use
	UNION/INTERSECT/EXCEPT (without ALL).  This adds on to the previous
	optimization for subqueries using DISTINCT.

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