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Fix bogus grammar for a CREATE CONSTRAINT TRIGGER error

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If certain constraint characteristic clauses (NO INHERIT, NOT VALID, NOT
ENFORCED) are given to CREATE CONSTRAINT TRIGGER, the resulting error
message is
  ERROR:  TRIGGER constraints cannot be marked NO INHERIT
which is a bit silly, because these aren't "constraints of type
TRIGGER".  Hardcode a better error message to prevent it.  This is a
cosmetic fix for quite a fringe problem with no known complaints from
users, so no backpatch.

While at it, silently accept ENFORCED if given.

Author: Amul Sul <sulamul@gmail.com>
Reviewed-by: jian he <jian.universality@gmail.com>
Reviewed-by: Fujii Masao <masao.fujii@oss.nttdata.com>
Reviewed-by: Álvaro Herrera <alvherre@kurilemu.de>
Discussion: https://postgr.es/m/CAAJ_b97hd-jMTS7AjgU6TDBCzDx_KyuKxG+K-DtYmOieg+giyQ@mail.gmail.com
Discussion: https://postgr.es/m/CACJufxHSp2puxP=q8ZtUGL1F+heapnzqFBZy5ZNGUjUgwjBqTQ@mail.gmail.com
This commit is contained in:
Álvaro Herrera
2025-07-03 11:25:39 +02:00
parent 8ec04c8577
commit 87251e1149
4 changed files with 65 additions and 4 deletions
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22
src/backend/parser/gram.y
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@@ -6041,6 +6041,26 @@ CreateTrigStmt:
EXECUTE FUNCTION_or_PROCEDURE func_name '(' TriggerFuncArgs ')'
{
CreateTrigStmt *n = makeNode(CreateTrigStmt);
bool dummy;
if (($11 & CAS_NOT_VALID) != 0)
ereport(ERROR,
errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("constraint triggers cannot be marked %s",
"NOT VALID"),
parser_errposition(@11));
if (($11 & CAS_NO_INHERIT) != 0)
ereport(ERROR,
errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("constraint triggers cannot be marked %s",
"NO INHERIT"),
parser_errposition(@11));
if (($11 & CAS_NOT_ENFORCED) != 0)
ereport(ERROR,
errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("constraint triggers cannot be marked %s",
"NOT ENFORCED"),
parser_errposition(@11));
n->replace = $2;
if (n->replace) /* not supported, see CreateTrigger */
@@ -6060,7 +6080,7 @@ CreateTrigStmt:
n->whenClause = $15;
n->transitionRels = NIL;
processCASbits($11, @11, "TRIGGER",
&n->deferrable, &n->initdeferred, NULL,
&n->deferrable, &n->initdeferred, &dummy,
NULL, NULL, yyscanner);
n->constrrel = $10;
$$ = (Node *) n;