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We don't need two passes if we scan child partitions before parents, as that way the children's present_parts are up to date before they're needed. I (tgl) think there's actually a bug being fixed here, for the case of an intermediate partitioned table with no direct leaf children, but haven't attempted to construct a test case to prove it. David Rowley Discussion: https://postgr.es/m/CAKJS1f-6GODRNgEtdPxCnAPme2h2hTztB6LmtfdmcYAAOE0kQg@mail.gmail.com