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
Message-ID: 20040119034941.D90A3D1E81E@svr1.postgresql.org
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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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