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Catalog domain not-null constraints

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This applies the explicit catalog representation of not-null
constraints introduced by b0e96f3119 for table constraints also to
domain not-null constraints.

Reviewed-by: Aleksander Alekseev <aleksander@timescale.com>
Reviewed-by: jian he <jian.universality@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/9ec24d7b-633d-463a-84c6-7acff769c9e8%40eisentraut.org
This commit is contained in:
Peter Eisentraut
2024-03-20 09:29:08 +01:00
parent c9c260decd
commit e5da0fe3c2
10 changed files with 386 additions and 115 deletions
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44
src/backend/catalog/pg_constraint.c
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@@ -629,6 +629,50 @@ findNotNullConstraint(Oid relid, const char *colname)
return findNotNullConstraintAttnum(relid, attnum);
}
/*
* Find and return the pg_constraint tuple that implements a validated
* not-null constraint for the given domain.
*/
HeapTuple
findDomainNotNullConstraint(Oid typid)
{
Relation pg_constraint;
HeapTuple conTup,
retval = NULL;
SysScanDesc scan;
ScanKeyData key;
pg_constraint = table_open(ConstraintRelationId, AccessShareLock);
ScanKeyInit(&key,
Anum_pg_constraint_contypid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(typid));
scan = systable_beginscan(pg_constraint, ConstraintRelidTypidNameIndexId,
true, NULL, 1, &key);
while (HeapTupleIsValid(conTup = systable_getnext(scan)))
{
Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(conTup);
/*
* We're looking for a NOTNULL constraint that's marked validated.
*/
if (con->contype != CONSTRAINT_NOTNULL)
continue;
if (!con->convalidated)
continue;
/* Found it */
retval = heap_copytuple(conTup);
break;
}
systable_endscan(scan);
table_close(pg_constraint, AccessShareLock);
return retval;
}
/*
* Given a pg_constraint tuple for a not-null constraint, return the column
* number it is for.