diff --git a/src/sql/engine/window_function/ob_window_function_op.cpp b/src/sql/engine/window_function/ob_window_function_op.cpp
index 98de76525..665a8b529 100644
--- a/src/sql/engine/window_function/ob_window_function_op.cpp
+++ b/src/sql/engine/window_function/ob_window_function_op.cpp
@@ -70,7 +70,9 @@ OB_SERIALIZE_MEMBER((ObWindowFunctionSpec, ObOpSpec),
                     rd_sort_cmp_funcs_,
                     rd_pby_sort_cnt_,
                     role_type_,
-                    wf_aggr_status_expr_);
+                    wf_aggr_status_expr_,
+                    input_rows_mem_bound_ratio_,
+                    estimated_part_cnt_);
 
 OB_SERIALIZE_MEMBER(ObWindowFunctionOpInput, local_task_count_, total_task_count_, wf_participator_shared_info_);
 
diff --git a/src/sql/engine/window_function/ob_window_function_op.h b/src/sql/engine/window_function/ob_window_function_op.h
index 7f4ac1138..0d44232fe 100644
--- a/src/sql/engine/window_function/ob_window_function_op.h
+++ b/src/sql/engine/window_function/ob_window_function_op.h
@@ -227,7 +227,9 @@ public:
       rd_sort_cmp_funcs_(alloc),
       rd_pby_sort_cnt_(0),
       role_type_(0),
-      wf_aggr_status_expr_(NULL)
+      wf_aggr_status_expr_(NULL),
+      input_rows_mem_bound_ratio_(0.5),
+      estimated_part_cnt_(1)
   {
   }
   DECLARE_VIRTUAL_TO_STRING;
@@ -288,6 +290,9 @@ public:
   int64_t rd_pby_sort_cnt_;
   int64_t role_type_;
   ObExpr *wf_aggr_status_expr_;
+  // The percentage of memory used by input_rows to the total memory used by input_rows and res_rows
+  double input_rows_mem_bound_ratio_;
+  int64_t estimated_part_cnt_;
 
 private:
   // disallow copy