check constraint.
hi.
rebase and minor refactoring.
From ba604766c43e474aa6b08ba613dfb04854ec7f40 Mon Sep 17 00:00:00 2001
From: jian he
Date: Fri, 4 Jul 2025 19:51:43 +0800
Subject: [PATCH v2 1/1] alter check constraint enforceability
syntax: ALTER TABLE ALTER CONSTRAINT [NOT] ENF
:00:00 2001
From: jian he
Date: Mon, 2 Jun 2025 21:54:53 +0800
Subject: [PATCH v1 1/1] alter check constraint enforceability
context: https://git.postgresql.org/cgit/postgresql.git/commit/?id=ca87c415e2fccf81cec6fd45698dde9fae0ab570
discussion: https://postgr.es/m/
---
doc/src/sgml/ref