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Andrew Dunstan 342051d73b Add support for altering CHECK constraint enforceability ... This commit adds support for ALTER TABLE ALTER CONSTRAINT ... [NOT] ENFORCED for CHECK constraints. Previously, only foreign key constraints could have their enforceability altered. When changing from NOT ENFORCED to ENFORCED, the operation not only updates catalog information but also performs a full table scan in Phase 3 to validate that existing data satisfies the constraint. For partitioned tables and inheritance hierarchies, the operation recurses to all child tables. When changing to NOT ENFORCED, we must recurse even if the parent is already NOT ENFORCED, since child constraints may still be ENFORCED. Author: Jian He <jian.universality@gmail.com> Reviewed-by: Robert Treat <rob@xzilla.net> Reviewed-by: Kirill Reshke <reshkekirill@gmail.com> Reviewed-by: Amul Sul <sulamul@gmail.com> Reviewed-by: Zsolt Parragi <zsolt.parragi@cybertec.at> Reviewed-by: Andrew Dunstan <andrew@dunslane.net> Discussion: https://postgr.es/m/CACJufxHCh_FU-FsEwsCvg9mN6-5tzR6H9ntn+0KUgTCaerDOmg@mail.gmail.com		2 weeks ago
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src	Add support for altering CHECK constraint enforceability	2 weeks ago
KNOWN_BUGS	…
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