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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2020-10-06 11:43:54 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2020-10-06 11:43:54 -0400 |
| commit | 3d69efc4f07d773329dfbd39d6ec67a025cf7339 (patch) | |
| tree | e3ed8e584eacf43624566d3fcbe087ed7f8aa5d6 /src/backend/access/gist/gistvalidate.c | |
| parent | 9b8e6857b8170f09861baa1bfd074fa0c8af9cfd (diff) | |
| download | postgresql-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
Diffstat (limited to 'src/backend/access/gist/gistvalidate.c')
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