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Commit d1379ebf4 carelessly broke printACLColumn for pre-9.4 servers, by using the cardinality() function which we introduced in 9.4. We expect psql's describe-related commands to work back to 9.2, so this is bad. Use the longstanding array_length() function instead. Per report from Christoph Berg. Back-patch to v17. Discussion: https://postgr.es/m/ZvLXYglRS6hMMhtr@msg.df7cb.de