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b60be3f2

Commit b60be3f2 authored 22 years ago by Tom Lane

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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.

parent 54cb1db6

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Changes 11

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src/backend/executor/nodeAgg.c 4 additions, 1 deletion

src/backend/executor/nodeAgg.c
src/backend/nodes/copyfuncs.c 3 additions, 3 deletions

src/backend/nodes/copyfuncs.c
src/backend/nodes/equalfuncs.c 4 additions, 4 deletions

src/backend/nodes/equalfuncs.c
src/backend/optimizer/plan/createplan.c 17 additions, 27 deletions

src/backend/optimizer/plan/createplan.c
src/backend/optimizer/plan/initsplan.c 66 additions, 1 deletion

src/backend/optimizer/plan/initsplan.c
src/backend/optimizer/plan/planner.c 85 additions, 22 deletions

src/backend/optimizer/plan/planner.c
src/backend/optimizer/plan/setrefs.c 11 additions, 9 deletions

src/backend/optimizer/plan/setrefs.c
src/backend/utils/adt/selfuncs.c 251 additions, 3 deletions

src/backend/utils/adt/selfuncs.c
src/include/nodes/parsenodes.h 2 additions, 1 deletion

src/include/nodes/parsenodes.h
src/include/optimizer/planmain.h 7 additions, 3 deletions

src/include/optimizer/planmain.h
src/include/utils/selfuncs.h 4 additions, 1 deletion

src/include/utils/selfuncs.h

with 454 additions and 75 deletions

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