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(parent: 5d1af6a) | patch

author	Tom Lane <tgl@sss.pgh.pa.us>
	Wed, 7 Apr 2004 18:17:25 +0000 (18:17 +0000)
committer	Tom Lane <tgl@sss.pgh.pa.us>
	Wed, 7 Apr 2004 18:17:25 +0000 (18:17 +0000)
commit	989067bd2208398d803e784582e96811d652f574
tree	03e25367119186414e746b2421643b66c07b2198	tree
parent	5d1af6aee3c78bb01d78e0a150c9617b1ff23500	commit \| diff

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.

src/backend/optimizer/plan/planner.c		diff \| blob \| blame \| history
src/backend/optimizer/prep/prepunion.c		diff \| blob \| blame \| history
src/include/optimizer/prep.h		diff \| blob \| blame \| history

Heikki's random PostgreSQL patches