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.