Fix set stmt view limit pushdown bug.

src/sql/rewrite/ob_transform_outerjoin_limit_pushdown.cpp

@@ -405,8 +405,13 @@ int ObTransformOuterJoinLimitPushDown::check_validity_for_target_table(OjLimitPu
     } else if (has_rownum) {
       is_valid = false;
     } else {
-      // no need to create new view
-      helper.need_create_view_ = false;
+      if (ref_query->is_set_stmt()) {
+        helper.need_create_view_ = true;
+      } else {
+        // no need to create new view
+        helper.need_create_view_ = false;
+      }
+      helper.need_rename_ = true;
       helper.view_table_ = helper.target_table_;
     }
   } else {

src/sql/rewrite/ob_transform_outerjoin_limit_pushdown.h

@@ -35,7 +35,8 @@ private:
           extracted_conditions_(),
           saved_order_items_(),
           is_limit_only_(false),
-          need_create_view_(true)
+          need_create_view_(true),
+          need_rename_(false)
     {}
     virtual ~OjLimitPushDownHelper(){};
 
@@ -46,9 +47,10 @@ private:
     ObSEArray<OrderItem, 8> saved_order_items_;
     bool is_limit_only_;
     bool need_create_view_;
+    bool need_rename_;
 
     TO_STRING_KV(K_(select_stmt), K_(target_table), K_(view_table), K_(extracted_conditions), K_(saved_order_items),
-        K_(is_limit_only), K_(need_create_view));
+        K_(is_limit_only), K_(need_create_view), K_(need_rename));
   };
 
 public: