1 files changed, 15 insertions, 0 deletions
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 50942267500..5e7db52cebc 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -1941,6 +1941,21 @@ alter_table_cmd:
 					n->def = $2;
 					$$ = (Node *)n;
 				}
+			/* ALTER TABLE <name> ALTER CONSTRAINT ... */
+			| ALTER CONSTRAINT name ConstraintAttributeSpec
+				{
+					AlterTableCmd *n = makeNode(AlterTableCmd);
+					Constraint *c = makeNode(Constraint);
+					n->subtype = AT_AlterConstraint;
+					n->def = (Node *) c;
+					c->contype = CONSTR_FOREIGN; /* others not supported, yet */
+					c->conname = $3;
+					processCASbits($4, @4, "ALTER CONSTRAINT statement",
+									&c->deferrable,
+									&c->initdeferred,
+									NULL, NULL, yyscanner);
+					$$ = (Node *)n;
+				}
 			/* ALTER TABLE <name> VALIDATE CONSTRAINT ... */
 			| VALIDATE CONSTRAINT name
 				{