Обсуждение: pgsql-server/src backend/nodes/outfuncs.c back ...

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pgsql-server/src backend/nodes/outfuncs.c back ...

От
tgl@svr1.postgresql.org (Tom Lane)
Дата:
CVSROOT:    /cvsroot
Module name:    pgsql-server
Changes by:    tgl@svr1.postgresql.org    04/01/05 14:04:39

Modified files:
    src/backend/nodes: outfuncs.c
    src/backend/optimizer/plan: createplan.c
    src/backend/optimizer/util: clauses.c pathnode.c
    src/include/nodes: relation.h
    src/include/optimizer: clauses.h

Log message:
    Improve UniquePath logic to detect the case where the input is already
    known unique (eg, it is a SELECT DISTINCT ... subquery), and not do a
    redundant unique-ification step.