CVSROOT: /cvsroot
Module name: pgsql-server
Changes by: tgl@svr1.postgresql.org 04/04/07 15:17:25
Modified files:
src/backend/optimizer/plan: planner.c
src/backend/optimizer/prep: prepunion.c
src/include/optimizer: prep.h
Log message:
Extend set-operation planning to keep track of the sort ordering induced
by the set operation, so that redundant sorts at higher levels can be
avoided. This was foreseen a good while back, but not done. Per request
from Karel Zak.