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bf5b13a8a0
Remove bogus stripping of RelabelTypes: that can result in building an output SAOP tree with incorrect exposed exprType for the operands, which might confuse polymorphic operators. Moreover it demonstrably prevents folding some OR-trees to SAOPs when the RHS expressions have different base types that were coerced to the same type by RelabelTypes. Reduce prohibition on type_is_rowtype to just disallow type RECORD. We need that because otherwise we would happily fold multiple RECORD Consts into a RECORDARRAY Const even if they aren't the same record type. (We could allow that perhaps, if we checked that they all have the same typmod, but the case doesn't seem worth that much effort.) However, there is no reason at all to disallow the transformation for named composite types, nor domains over them: as long as we can find a suitable array type we're good. Remove some assertions that seem rather out of place (it's not this code's duty to verify that the RestrictInfo structure is sane). Rewrite some comments. The issues with RelabelType stripping seem severe enough to back-patch this into v18 where the code was introduced. Author: Tender Wang <tndrwang@gmail.com> Co-authored-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAHewXN=aH7GQBk4fXU-WaEeVmQWUmBAeNyBfJ3VKzPphyPKUkQ@mail.gmail.com Backpatch-through: 18 |
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