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Add ALTER TABLE ... ALTER CONSTRAINT ... SET [NO] INHERIT

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This allows to redefine an existing non-inheritable constraint to be
inheritable, which allows to straighten up situations with NO INHERIT
constraints so that thay can become normal constraints without having to
re-verify existing data.  For existing inheritance children this may
require creating additional constraints, if they don't exist already.

It also allows to do the opposite, if only for symmetry.

Author: Suraj Kharage <suraj.kharage@enterprisedb.com>
Reviewed-by: jian he <jian.universality@gmail.com>
Discussion: https://postgr.es/m/CAF1DzPVfOW6Kk=7SSh7LbneQDJWh=PbJrEC_Wkzc24tHOyQWGg@mail.gmail.com
This commit is contained in:
Álvaro Herrera
2025-03-05 13:50:22 +01:00
parent f4694e0f35
commit f4e53e10b6
6 changed files with 359 additions and 19 deletions
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28
src/backend/parser/gram.y
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@ -2669,6 +2669,34 @@ alter_table_cmd:
NULL, NULL, NULL, yyscanner);
$$ = (Node *) n;
}
/* ALTER TABLE <name> ALTER CONSTRAINT SET INHERIT */
| ALTER CONSTRAINT name SET INHERIT
{
AlterTableCmd *n = makeNode(AlterTableCmd);
ATAlterConstraint *c = makeNode(ATAlterConstraint);
n->subtype = AT_AlterConstraint;
n->def = (Node *) c;
c->conname = $3;
c->alterInheritability = true;
c->noinherit = false;
$$ = (Node *) n;
}
/* ALTER TABLE <name> ALTER CONSTRAINT SET NO INHERIT */
| ALTER CONSTRAINT name SET NO INHERIT
{
AlterTableCmd *n = makeNode(AlterTableCmd);
ATAlterConstraint *c = makeNode(ATAlterConstraint);
n->subtype = AT_AlterConstraint;
n->def = (Node *) c;
c->conname = $3;
c->alterInheritability = true;
c->noinherit = true;
$$ = (Node *) n;
}
/* ALTER TABLE <name> VALIDATE CONSTRAINT ... */
| VALIDATE CONSTRAINT name
{