[FEAT MERGE]logical plan move to plan cache module add feedback into to plan

src/sql/engine/px/ob_dfo.cpp

@@ -1007,4 +1007,4 @@ const ObPhysicalPlan* ObDfo::get_plan_by_root()
     plan = root_op_spec_->get_phy_plan();
   }
   return plan;
-}
+}