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Invalid indexes are suffixed with "_ccnew" or "_ccold". The documentation missed to mention the initial underscore. ChooseRelationName() may also append an extra number if indexes with a similar name already exist; let's add a note about that too. Author: Alec Cozens <acozens@pixelpower.com> Discussion: https://postgr.es/m/174733277404.1455388.11471370288789479593@wrigleys.postgresql.org Backpatch-through: 13