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cba4e78f35
While directly targetting a foreign table with MERGE was already expressly forbidden, we failed to catch the case of a partitioned table that has a foreign table as a partition; and the result if you try is an incomprehensible error. Fix that by adding a specific check. Backpatch to 15. Reported-by: Tatsuhiro Nakamori <bt22nakamorit@oss.nttdata.com> Discussion: https://postgr.es/m/bt22nakamorit@oss.nttdata.com