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where the EquivalenceClass machinery is unable to deduce anything more from a simple "var = const" qual clause. There are probably some more cases where this could be done, but this seems to take care of most of the added overhead for simple queries. Per gripe from Guillaume Smet. In passing, fix a problem that was exposed by this change: reconsider_outer_join_clause and friends were passing the wrong relids to build_implied_join_equality, resulting in RestrictInfos with the wrong required_relids. This mistake was masked in typical cases since the bogus RestrictInfos would never have escaped from the EquivalenceClass machinery, but I think there might be corner cases involving "broken" ECs where there would have been a visible failure even without the new optimization. In any case the code was certainly not operating as intended. |
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