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Some code added by commit 2f094e7ac69 needs to be behind a version check so that it is not run against older databases. Author: Andrew Dunstan <andrew@dunslane.net> Reviewed-by: Junwang Zhao <zhjwpku@gmail.com> Discussion: https://www.postgresql.org/message-id/afe3f099-3271-4fc4-8e32-467b5309affb%40dunslane.net