[CBRD-25318] Problem that the subquery containing orderby_num() is vi…

…ew-merged. (CUBRID#5140)

http://jira.cubrid.org/browse/CBRD-25318

Problem that the subquery containing orderby_num() is view-merged. 
add check for order_by.

src/parser/view_transform.c

@@ -1735,7 +1735,9 @@ mq_is_pushable_subquery (PARSER_CONTEXT * parser, PT_NODE * subquery, PT_NODE *
 
   /* determine if class_spec is the only spec in the statement */
   is_rownum_only = mq_is_rownum_only_predicate (parser, statement_spec, mainquery, order_by, subquery, class_);
-  is_only_spec = ((statement_spec->next == NULL && (pred == NULL || is_rownum_only)) ? true : false);
+  is_only_spec =
+    ((statement_spec->next == NULL && (pred == NULL || is_rownum_only)
+      && (subquery->info.query.order_by == NULL || order_by == NULL)) ? true : false);
 
   /* check if orderby_for set to PT_EXPR_INFO_ROWNUM_ONLY */
   orderby_for = subquery->info.query.orderby_for;