CVSROOT:	/cvsroot
Module name:	pgsql-server
Changes by:	tgl(at)svr1(dot)postgresql(dot)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.

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