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3d69efc4f0
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