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Add support for NOT ENFORCED in CHECK constraints

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This adds support for the NOT ENFORCED/ENFORCED flag for constraints,
with support for check constraints.

The plan is to eventually support this for foreign key constraints,
where it is typically more useful.

Note that CHECK constraints do not currently support ALTER operations,
so changing the enforceability of an existing constraint isn't
possible without dropping and recreating it.  This could be added
later.

Author: Amul Sul <amul.sul@enterprisedb.com>
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Reviewed-by: jian he <jian.universality@gmail.com>
Tested-by: Triveni N <triveni.n@enterprisedb.com>
Discussion: https://www.postgresql.org/message-id/flat/CAAJ_b962c5AcYW9KUt_R_ER5qs3fUGbe4az-SP-vuwPS-w-AGA@mail.gmail.com
This commit is contained in:
Peter Eisentraut
2025-01-11 10:45:17 +01:00
parent 72ceb21b02
commit ca87c415e2
37 changed files with 599 additions and 70 deletions
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8
src/backend/executor/execMain.c
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@ -1751,11 +1751,15 @@ ExecRelCheck(ResultRelInfo *resultRelInfo,
{
oldContext = MemoryContextSwitchTo(estate->es_query_cxt);
resultRelInfo->ri_ConstraintExprs =
(ExprState **) palloc(ncheck * sizeof(ExprState *));
(ExprState **) palloc0(ncheck * sizeof(ExprState *));
for (i = 0; i < ncheck; i++)
{
Expr *checkconstr;
/* Skip not enforced constraint */
if (!check[i].ccenforced)
continue;
checkconstr = stringToNode(check[i].ccbin);
resultRelInfo->ri_ConstraintExprs[i] =
ExecPrepareExpr(checkconstr, estate);
@ -1782,7 +1786,7 @@ ExecRelCheck(ResultRelInfo *resultRelInfo,
* is not to be treated as a failure. Therefore, use ExecCheck not
* ExecQual.
*/
if (!ExecCheck(checkconstr, econtext))
if (checkconstr && !ExecCheck(checkconstr, econtext))
return check[i].ccname;
}