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On partition detach, we acquire a SHARE lock on all tables that reference the partitioned table that we're detaching a partition from, but failed to document this fact. My oversight in commit f56f8f8da6af. Repair. Backpatch to 12. Author: Álvaro Herrera <alvherre@alvh.no-ip.org> Discussion: https://postgr.es/m/20210325180244.GA12738@alvherre.pgsql