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Such queries don't expand automatically updatable views, and ModifyTable uses the wholerow attribute unconditionally. The user-visible behavior is fine, so change to more-specific assertions. Commit d5f788b41dc2cbdde6e7694c70dda54d829a5ed5 added the wrong assertion. Back-patch to v17, where commit 5f2e179bd31e5f5803005101eb12a8d7bf8db8f3 introduced MERGE view_name. Reported by Alexander Lakhin. Discussion: https://postgr.es/m/e4b40a88-c134-6926-3196-bc4501cb87a2@gmail.com