Обсуждение: pgsql-server/src/backend executor/Tag: executo ...

CVSROOT:    /cvsroot
Module name:    pgsql-server
Changes by:    tgl@svr1.postgresql.org    03/11/25 15:17:59

Modified files:
    src/backend/executor: Tag: REL7_4_STABLE nodeHashjoin.c
    src/backend/optimizer/plan: Tag: REL7_4_STABLE createplan.c

Log message:
    Band-aid solution for problems with SubPlans used in hash join clauses,
    per report from Andrew Holm-Hansen.  The difficulty arises from the fact
    that the planner allowed a Hash node's hashkeys to share substructure
    with the parent HashJoin node's hashclauses, plus some rather bizarre
    choices about who initializes what during executor startup.  A cleaner
    but more invasive solution is to not store hashkeys separately in the
    plan tree at all, but let the HashJoin node deconstruct hashclauses
    during executor startup.  I plan to fix it that way in HEAD.