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When a partition is being detached in concurrent mode, it is possible for find_inheritance_children_extended() to return that partition in the list, and immediately after that receive an invalidation message that sets its relpartbound to NULL just before we read it. (This can happen because table_open() reads invalidation messages.) Currently we raise an error ERROR: missing relpartbound for relation %u about the situation, but that's bogus because the table is no longer a partition, so we shouldn't be complaining about it. A better reaction is to retry the find_inheritance_children_extended call to get a new list, which will no longer have the partition being detached. Noticed while investigating bug #18377. Backpatch to 14, where DETACH CONCURRENTLY appeared. Discussion: https://postgr.es/m/202405201616.y4ht2qe5ihoy@alvherre.pgsql