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b663b9436e
This feature was intentionally omitted when FKs were first implemented for partitioned tables, and had been requested a few times; the usefulness is clear. Validation can happen for each partition individually, which is useful to contain the number of locks held and the duration; or it can be executed for the partitioning hierarchy as a single command, which validates all child constraints that haven't been validated already. This is also useful to implement NOT ENFORCED constraints on top. Author: Amul Sul <sulamul@gmail.com> Discussion: https://postgr.es/m/CAAJ_b96Bp=-ZwihPPtuaNX=SrZ0U6ZsXD3+fgARO0JuKa8v2jQ@mail.gmail.com