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We haven't had bugs in this area, but there's some not-entirely trivial code to detect that case, so it seems good to have test coverage for it. Author: Peter Smith <smithpb2250@gmail.com> Reviewed-by: vignesh C <vignesh21@gmail.com> Reviewed-by: Tomas Vondra <tomas@vondra.me> Discussion: https://www.postgresql.org/message-id/CAHut%2BPtX8P0EGhsk9p%3DhQGUHrzxeCSzANXSMKOvYiLX-EjdyNw@mail.gmail.com