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 b4c26462d9..0e954d7d5a 100644
--- a/src/sql/engine/window_function/ob_window_function_op.cpp
+++ b/src/sql/engine/window_function/ob_window_function_op.cpp
@@ -1548,16 +1548,19 @@ int ObWindowFunctionOp::inner_close()
     local_allocator_.free(pby_hash_values_.at(i));
     pby_hash_values_.at(i) = NULL;
   }
+  pby_hash_values_.reset();
   for (int64_t i = 0; i < participator_whole_msg_array_.count(); ++i) {
     participator_whole_msg_array_.at(i)->reset();
     local_allocator_.free(participator_whole_msg_array_.at(i));
     participator_whole_msg_array_.at(i) = NULL;
   }
+  participator_whole_msg_array_.reset();
   for (int64_t i = 0; i < pby_hash_values_sets_.count(); ++i) {
     pby_hash_values_sets_.at(i)->destroy();
     local_allocator_.free(pby_hash_values_sets_.at(i));
     pby_hash_values_sets_.at(i) = NULL;
   }
+  pby_hash_values_sets_.reset();
   return ObOperator::inner_close();
 }