pgsql-server/src backend/executor/nodeAgg.c ba ...

CVSROOT: /cvsroot
Module name: pgsql-server
Changes by: tgl(at)postgresql(dot)org 02/11/19 18:22:00

Modified files:
src/backend/executor: nodeAgg.c
src/backend/nodes: copyfuncs.c equalfuncs.c
src/backend/optimizer/plan: createplan.c initsplan.c planner.c
setrefs.c
src/backend/utils/adt: selfuncs.c
src/include/nodes: parsenodes.h
src/include/optimizer: planmain.h
src/include/utils: selfuncs.h

Log message:
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.