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Add an optional bool *has_volatile output parameter to DomainHasConstraints(). When non-NULL, the function checks whether any CHECK constraint contains a volatile expression. Callers that don't need this information pass NULL and get the same behavior as before. This is needed by a subsequent commit that enables the fast default optimization for domains with non-volatile constraints: we can safely evaluate such constraints once at ALTER TABLE time, but volatile constraints require a full table rewrite. Author: Jian He <jian.universality@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Andrew Dunstan <andrew@dunslane.net> Reviewed-by: Viktor Holmberg <viktor.holmberg@aiven.io> Discussion: https://postgr.es/m/CACJufxE_+iZBR1i49k_AHigppPwLTJi6km8NOsC7FWvKdEmmXg@mail.gmail.com