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From [email protected] (Tom Lane)
Subject pgsql-server/src backend/executor/nodeAgg.c ba ...
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Msg-id [email protected]
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CVSROOT:    /cvsroot
Module name:    pgsql-server
Changes by:    [email protected]    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.

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