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authorTom Lane <tgl@sss.pgh.pa.us>2020-10-06 11:43:54 -0400
committerTom Lane <tgl@sss.pgh.pa.us>2020-10-06 11:43:54 -0400
commit3d69efc4f07d773329dfbd39d6ec67a025cf7339 (patch)
treee3ed8e584eacf43624566d3fcbe087ed7f8aa5d6 /src/backend/access/gist/gistget.c
parent9b8e6857b8170f09861baa1bfd074fa0c8af9cfd (diff)
downloadpostgresql-3d69efc4f07d773329dfbd39d6ec67a025cf7339.tar.gz
postgresql-3d69efc4f07d773329dfbd39d6ec67a025cf7339.zip
Build EC members for child join rels in the right memory context.
This patch prevents crashes or wrong plans when partition-wise joins are considered during GEQO planning, as a consequence of the EquivalenceClass data structures becoming corrupt after a GEQO context reset. A remaining problem is that successive GEQO cycles will make multiple copies of the required EC members, since add_child_join_rel_equivalences has no idea that such members might exist already. For now we'll just live with that. The lack of field complaints of crashes suggests that this is a mighty little-used situation. Back-patch to v12 where this code was introduced. Discussion: https://postgr.es/m/1683100.1601860653@sss.pgh.pa.us
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