pgsql-server/src/backend/optimizer/util pathnode.c
Started by Tom Laneover 22 years ago1 messagescomitters
CVSROOT: /cvsroot
Module name: pgsql-server
Changes by: tgl@svr1.postgresql.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.