MDEV-13678: DELETE with CASCADE takes a long time when Galera is enabled

Use wsrep_must_process_fk function to check if foreign key
constraint needs to be processed in case of Galera is enabled.

storage/innobase/row/row0upd.cc

@@ -464,15 +464,10 @@ static
 bool
 wsrep_must_process_fk(const upd_node_t* node, const trx_t* trx)
 {
-	if (que_node_get_type(node->common.parent) != QUE_NODE_UPDATE
-	    || !wsrep_on(trx->mysql_thd)) {
-		return false;
-	}
+	const upd_node_t* parent = static_cast<const upd_node_t*>(node->common.parent);
 
-	const upd_cascade_t&	nodes = *static_cast<const upd_node_t*>(
-		node->common.parent)->cascade_upd_nodes;
-	const upd_cascade_t::const_iterator end = nodes.end();
-	return std::find(nodes.begin(), end, node) == end;
+	return (!parent || (que_node_get_type(parent) != QUE_NODE_UPDATE) ||
+	        parent->cascade_upd_nodes->empty());
 }
 #endif /* WITH_WSREP */
 
@@ -2435,10 +2430,6 @@ row_upd_sec_index_entry(
 		if (!rec_get_deleted_flag(
 			    rec, dict_table_is_comp(index->table))) {
 
-#ifdef WITH_WSREP
-			que_node_t *parent = que_node_get_parent(node);
-#endif /* WITH_WSREP */
-
 			err = btr_cur_del_mark_set_sec_rec(
 				flags, btr_cur, TRUE, thr, &mtr);
 
@@ -2449,9 +2440,7 @@ row_upd_sec_index_entry(
 			if (!referenced && foreign &&
 			    wsrep_on(trx->mysql_thd) &&
 			    !wsrep_thd_is_BF(trx->mysql_thd, FALSE) &&
-			    (!parent || (que_node_get_type(parent) !=
-			     QUE_NODE_UPDATE)                     ||
-			    ((upd_node_t*)parent)->cascade_upd_nodes->empty())) {
+				wsrep_must_process_fk(node, trx)) {
 				ulint*	offsets = rec_get_offsets(
 					rec, index, NULL, ULINT_UNDEFINED,
 					&heap);
@@ -2670,9 +2659,6 @@ row_upd_clust_rec_by_insert(
 	rec_t*		rec;
 	ulint*		offsets			= NULL;
 
-#ifdef WITH_WSREP
-	que_node_t *parent = que_node_get_parent(node);
-#endif /* WITH_WSREP */
 	ut_ad(node);
 	ut_ad(dict_index_is_clust(index));
 
@@ -2761,8 +2747,7 @@ row_upd_clust_rec_by_insert(
 			}
 #ifdef WITH_WSREP
 		} else if (foreign && wsrep_on(trx->mysql_thd) &&
-			 (!parent || (que_node_get_type(parent) != QUE_NODE_UPDATE) ||
-			 ((upd_node_t*)parent)->cascade_upd_nodes->empty())) {
+			wsrep_must_process_fk(node, trx)) {
 
 			err = wsrep_row_upd_check_foreign_constraints(
 				node, pcur, table, index, offsets, thr, mtr);
@@ -2979,10 +2964,6 @@ row_upd_del_mark_clust_rec(
 	ut_ad(dict_index_is_clust(index));
 	ut_ad(node->is_delete);
 
-#ifdef WITH_WSREP
-	que_node_t *parent = que_node_get_parent(node);
-#endif /* WITH_WSREP */
-
 	pcur = node->pcur;
 	btr_cur = btr_pcur_get_btr_cur(pcur);
 
@@ -3009,8 +2990,7 @@ row_upd_del_mark_clust_rec(
 			node, pcur, index->table, index, offsets, thr, mtr);
 #ifdef WITH_WSREP
 	} else if (trx && wsrep_on(trx->mysql_thd)  &&
-	    (!parent || (que_node_get_type(parent) != QUE_NODE_UPDATE) ||
-	    ((upd_node_t*)parent)->cascade_upd_nodes->empty())) {
+		   wsrep_must_process_fk(node, trx)) {
 
 		err = wsrep_row_upd_check_foreign_constraints(
 			node, pcur, index->table, index, offsets, thr, mtr);