Release any detoasted copies of arrays that are made temporarily in

ri_FetchConstraintInfo, to avoid a query-duration memory leak when that
routine is called by RI_FKey_keyequal_upd_fk (which isn't executed in a
short-lived context).  This problem was latent when the routine was added
in February, but it didn't become serious until the varvarlena patch made
it quite likely that the fields being examined would be "toasted" (ie, have
short headers).  Per report from Stephen Denne.

src/backend/utils/adt/ri_triggers.c

@@ -15,7 +15,7 @@
  *
  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
  *
- * $PostgreSQL: pgsql/src/backend/utils/adt/ri_triggers.c,v 1.101 2008/01/03 21:23:15 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/utils/adt/ri_triggers.c,v 1.102 2008/01/25 04:46:07 tgl Exp $
  *
  * ----------
  */
@@ -3099,6 +3099,8 @@ ri_FetchConstraintInfo(RI_ConstraintInfo *riinfo,
 		elog(ERROR, "conkey is not a 1-D smallint array");
 	riinfo->nkeys = numkeys;
 	memcpy(riinfo->fk_attnums, ARR_DATA_PTR(arr), numkeys * sizeof(int16));
+	if ((Pointer) arr != DatumGetPointer(adatum))
+		pfree(arr);				/* free de-toasted copy, if any */
 
 	adatum = SysCacheGetAttr(CONSTROID, tup,
 							 Anum_pg_constraint_confkey, &isNull);
@@ -3113,6 +3115,8 @@ ri_FetchConstraintInfo(RI_ConstraintInfo *riinfo,
 		ARR_ELEMTYPE(arr) != INT2OID)
 		elog(ERROR, "confkey is not a 1-D smallint array");
 	memcpy(riinfo->pk_attnums, ARR_DATA_PTR(arr), numkeys * sizeof(int16));
+	if ((Pointer) arr != DatumGetPointer(adatum))
+		pfree(arr);				/* free de-toasted copy, if any */
 
 	adatum = SysCacheGetAttr(CONSTROID, tup,
 							 Anum_pg_constraint_conpfeqop, &isNull);
@@ -3127,6 +3131,8 @@ ri_FetchConstraintInfo(RI_ConstraintInfo *riinfo,
 		ARR_ELEMTYPE(arr) != OIDOID)
 		elog(ERROR, "conpfeqop is not a 1-D Oid array");
 	memcpy(riinfo->pf_eq_oprs, ARR_DATA_PTR(arr), numkeys * sizeof(Oid));
+	if ((Pointer) arr != DatumGetPointer(adatum))
+		pfree(arr);				/* free de-toasted copy, if any */
 
 	adatum = SysCacheGetAttr(CONSTROID, tup,
 							 Anum_pg_constraint_conppeqop, &isNull);
@@ -3141,6 +3147,8 @@ ri_FetchConstraintInfo(RI_ConstraintInfo *riinfo,
 		ARR_ELEMTYPE(arr) != OIDOID)
 		elog(ERROR, "conppeqop is not a 1-D Oid array");
 	memcpy(riinfo->pp_eq_oprs, ARR_DATA_PTR(arr), numkeys * sizeof(Oid));
+	if ((Pointer) arr != DatumGetPointer(adatum))
+		pfree(arr);				/* free de-toasted copy, if any */
 
 	adatum = SysCacheGetAttr(CONSTROID, tup,
 							 Anum_pg_constraint_conffeqop, &isNull);
@@ -3155,6 +3163,8 @@ ri_FetchConstraintInfo(RI_ConstraintInfo *riinfo,
 		ARR_ELEMTYPE(arr) != OIDOID)
 		elog(ERROR, "conffeqop is not a 1-D Oid array");
 	memcpy(riinfo->ff_eq_oprs, ARR_DATA_PTR(arr), numkeys * sizeof(Oid));
+	if ((Pointer) arr != DatumGetPointer(adatum))
+		pfree(arr);				/* free de-toasted copy, if any */
 
 	ReleaseSysCache(tup);
 }