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Commit 7103ebb7aa added support for MERGE, which included support for inheritance hierarchies, but didn't document the fact that ONLY could be specified before the source and/or target tables to exclude tables inheriting from the tables specified. Update merge.sgml to mention this, and while at it, add some regression tests to cover it. Dean Rasheed, reviewed by Nathan Bossart. Backpatch to 15, where MERGE was added. Discussion: https://postgr.es/m/CAEZATCU0XM-bJCvpJuVRU3UYNRqEBS6g4-zH%3Dj9Ye0caX8F6uQ%40mail.gmail.com