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Since partitions can be foreign tables not only plain tables, but logical replication only supports plain tables, we'd better check the relkind of a partition after we find it. (There was some discussion of checking this when adding a partitioned table to a subscription; but that would be inadequate since the troublesome partition could be added later.) Without this, the situation leads to a segfault or assertion failure. In passing, add a separate variable for the target Relation of a cross-partition UPDATE; reusing partrel seemed mighty confusing and error-prone. Shi Yu and Tom Lane, per report from Ilya Gladyshev. Back-patch to v13 where logical replication into partitioned tables became a thing. Discussion: https://postgr.es/m/6b93e3748ba43298694f376ca8797279d7945e29.camel@gmail.com