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/[email protected] Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/d7885b1f87fa066606acc54700edee28812be8c1 Modified Files -------------- src/backend/optimizer/path/equivclass.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
