Resolving memory-leak by adding px clean up

src/sql/engine/cmd/ob_table_direct_insert_service.h

@@ -0,0 +1,31 @@
+// Copyright (c) 2022-present Oceanbase Inc. All Rights Reserved.
+// Author:
+//   yuya.yu <yuya.yu@oceanbase.com>
+
+#pragma once
+
+#include "lib/ob_define.h"
+
+namespace oceanbase
+{
+namespace sql
+{
+class ObExecContext;
+class ObPhysicalPlan;
+
+class ObTableDirectInsertService
+{
+public:
+  static bool is_direct_insert(const ObPhysicalPlan &phy_plan);
+  // all insert-tasks within an insert into select clause are wrapped by a single direct insert instance
+  static int start_direct_insert(ObExecContext &ctx, ObPhysicalPlan &plan);
+  static int commit_direct_insert(ObExecContext &ctx, ObPhysicalPlan &plan);
+  static int finish_direct_insert(ObExecContext &ctx, ObPhysicalPlan &plan);
+  // each insert-task is processed in a single thread and is wrapped by a table load trans
+  static int open_task(const uint64_t table_id, const int64_t task_id);
+  static int close_task(const uint64_t table_id,
+                   const int64_t task_id,
+                   const int error_code = OB_SUCCESS);
+};
+} // namespace sql
+} // namespace oceanbase