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The previous coding inadvertently checked the constraints for the partitioned table rather than the target partition, which could lead to data in a partition that fails to satisfy some constraint on that partition. This problem seems to date back to when table partitioning was introduced; prior to that, there was only one target table for a COPY, so the problem didn't occur, and the code just didn't get updated. Etsuro Fujita, reviewed by Amit Langote and Ashutosh Bapat Discussion: https://postgr.es/message-id/5ABA4074.1090500%40lab.ntt.co.jp