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author	Tom Lane <tgl@sss.pgh.pa.us>
	Tue, 19 Nov 2002 23:22:00 +0000 (23:22 +0000)
committer	Tom Lane <tgl@sss.pgh.pa.us>
	Tue, 19 Nov 2002 23:22:00 +0000 (23:22 +0000)
commit	b60be3f2f8d094da79e04c6eda888f401b09dc39
tree	0590e0647deb5041b8dabcabf03770ebef8e8d43	tree \| snapshot
parent	54cb1db6cf4d4bf4e44148582bbd2c99684e7dfd	commit \| diff

Add an at-least-marginally-plausible method of estimating the number
of groups produced by GROUP BY. This improves the accuracy of planning
estimates for grouped subselects, and is needed to check whether a
hashed aggregation plan risks memory overflow.

Mirror of https://git.postgresql.org/git/postgresql.git

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src/backend/executor/nodeAgg.c		diff \| blob \| blame \| history
src/backend/nodes/copyfuncs.c		diff \| blob \| blame \| history
src/backend/nodes/equalfuncs.c		diff \| blob \| blame \| history
src/backend/optimizer/plan/createplan.c		diff \| blob \| blame \| history
src/backend/optimizer/plan/initsplan.c		diff \| blob \| blame \| history
src/backend/optimizer/plan/planner.c		diff \| blob \| blame \| history
src/backend/optimizer/plan/setrefs.c		diff \| blob \| blame \| history
src/backend/utils/adt/selfuncs.c		diff \| blob \| blame \| history
src/include/nodes/parsenodes.h		diff \| blob \| blame \| history
src/include/optimizer/planmain.h		diff \| blob \| blame \| history
src/include/utils/selfuncs.h		diff \| blob \| blame \| history