From: Andrew Dunstan <andrew@dunslane.net>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: Extend DomainHasConstraints() to optionally check constraint vol
Date: Thu, 12 Mar 2026 22:06:31 +0000
Message-ID: <E1w0oAp-003fmV-2Q@gemulon.postgresql.org> (raw)
Extend DomainHasConstraints() to optionally check constraint volatility
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
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/487cf2cbd2f5a32cf9756eb9bd6dbf9f3956c8b7
Modified Files
--------------
src/backend/commands/copyfrom.c | 2 +-
src/backend/commands/tablecmds.c | 4 ++--
src/backend/executor/execExpr.c | 2 +-
src/backend/optimizer/util/clauses.c | 2 +-
src/backend/parser/parse_expr.c | 2 +-
src/backend/utils/cache/typcache.c | 27 +++++++++++++++++++++++++--
src/include/utils/typcache.h | 2 +-
7 files changed, 32 insertions(+), 9 deletions(-)
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To: pgsql-committers@postgresql.org
Cc: andrew@dunslane.net, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: Extend DomainHasConstraints() to optionally check constraint vol
In-Reply-To: <E1w0oAp-003fmV-2Q@gemulon.postgresql.org>
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