diff --git a/src/sql/engine/cmd/ob_table_direct_insert_service.cpp b/src/sql/engine/cmd/ob_table_direct_insert_service.cpp
index 0a819b401..2fe310d75 100644
--- a/src/sql/engine/cmd/ob_table_direct_insert_service.cpp
+++ b/src/sql/engine/cmd/ob_table_direct_insert_service.cpp
@@ -10,6 +10,8 @@
 #include "observer/table_load/ob_table_load_store.h"
 #include "sql/engine/ob_exec_context.h"
 #include "sql/engine/ob_physical_plan.h"
+#include "sql/optimizer/ob_optimizer_context.h"
+#include "sql/resolver/dml/ob_insert_stmt.h"
 
 namespace oceanbase
 {
@@ -17,6 +19,36 @@ using namespace observer;
 
 namespace sql
 {
+// Direct-insert is enabled only when:
+// 1. _ob_enable_direct_load
+// 2. insert into select clause
+// 3. append hint + pdml
+// 4. auto_commit, not in a transaction
+int ObTableDirectInsertService::check_direct_insert(ObOptimizerContext &optimizer_ctx,
+                                                    const ObDMLStmt &stmt,
+                                                    bool &is_direct_insert)
+{
+  int ret = OB_SUCCESS;
+  bool auto_commit = false;
+  const ObSQLSessionInfo* session_info = optimizer_ctx.get_session_info();
+  is_direct_insert = false;
+  if (OB_ISNULL(session_info)) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("get unexpected null", KR(ret), KP(session_info));
+  } else if (OB_FAIL(session_info->get_autocommit(auto_commit))) {
+    LOG_WARN("failed to get auto commit", KR(ret));
+  } else if (GCONF._ob_enable_direct_load
+      && stmt::T_INSERT == stmt.get_stmt_type()
+      && static_cast<const ObInsertStmt &>(stmt).value_from_select()
+      && optimizer_ctx.get_global_hint().has_append()
+      && optimizer_ctx.use_pdml()
+      && auto_commit
+      && (!session_info->is_in_transaction())){
+    is_direct_insert = true;
+  }
+  return ret;
+}
+
 bool ObTableDirectInsertService::is_direct_insert(const ObPhysicalPlan &phy_plan)
 {
   return (phy_plan.get_enable_append() && (0 != phy_plan.get_append_table_id()));
@@ -37,8 +69,7 @@ int ObTableDirectInsertService::start_direct_insert(ObExecContext &ctx,
       LOG_WARN("failed to get auto commit", KR(ret));
     } else if (!auto_commit || session->is_in_transaction()) {
       ret = OB_NOT_SUPPORTED;
-      LOG_WARN("using direct-insert within a transaction is not supported",
-          KR(ret), K(auto_commit), K(session->is_in_transaction()));
+      LOG_USER_ERROR(OB_NOT_SUPPORTED, "using direct-insert within a transaction is");
     } else {
       ObTableDirectInsertCtx &table_direct_insert_ctx = ctx.get_table_direct_insert_ctx();
       uint64_t table_id = phy_plan.get_append_table_id();
diff --git a/src/sql/engine/cmd/ob_table_direct_insert_service.h b/src/sql/engine/cmd/ob_table_direct_insert_service.h
index f4a3ca8fe..2a7a461f3 100644
--- a/src/sql/engine/cmd/ob_table_direct_insert_service.h
+++ b/src/sql/engine/cmd/ob_table_direct_insert_service.h
@@ -12,10 +12,15 @@ namespace sql
 {
 class ObExecContext;
 class ObPhysicalPlan;
+class ObOptimizerContext;
+class ObDMLStmt;
 
 class ObTableDirectInsertService
 {
 public:
+  static int check_direct_insert(ObOptimizerContext &optimizer_ctx,
+                                 const ObDMLStmt &stmt,
+                                 bool &is_direct_insert);
   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);
diff --git a/src/sql/optimizer/ob_del_upd_log_plan.cpp b/src/sql/optimizer/ob_del_upd_log_plan.cpp
index 6c515d0fb..a41dfc911 100644
--- a/src/sql/optimizer/ob_del_upd_log_plan.cpp
+++ b/src/sql/optimizer/ob_del_upd_log_plan.cpp
@@ -21,6 +21,7 @@
 #include "sql/resolver/dml/ob_merge_stmt.h"
 #include "sql/rewrite/ob_transform_utils.h"
 #include "sql/dblink/ob_dblink_utils.h"
+#include "sql/engine/cmd/ob_table_direct_insert_service.h"
 
 using namespace oceanbase;
 using namespace sql;
@@ -1532,8 +1533,10 @@ int ObDelUpdLogPlan::collect_related_local_index_ids(IndexDMLInfo &primary_dml_i
   if (OB_ISNULL(stmt) || OB_ISNULL(schema_guard = optimizer_context_.get_schema_guard())) {
     ret = OB_ERR_UNEXPECTED;
     LOG_WARN("schema guard is nullptr", K(ret), K(stmt), K(schema_guard));
-  } else if (OB_FAIL(is_direct_insert_into_select(is_direct_insert))) {
-    LOG_WARN("failed to check is direct insert into select", KR(ret));
+  } else if (OB_FAIL(ObTableDirectInsertService::check_direct_insert(optimizer_context_,
+                                                                     *stmt,
+                                                                     is_direct_insert))) {
+    LOG_WARN("failed to check direct insert", KR(ret));
   } else if (is_direct_insert) {
     // no need building index
     index_tid_array_size = 0;
@@ -1653,8 +1656,14 @@ int ObDelUpdLogPlan::prepare_table_dml_info_basic(const ObDmlTableInfo& table_in
     uint64_t index_tid[OB_MAX_INDEX_PER_TABLE];
     int64_t index_cnt = OB_MAX_INDEX_PER_TABLE;
     bool is_direct_insert = false;
-    if (OB_FAIL(is_direct_insert_into_select(is_direct_insert))) {
-      LOG_WARN("failed to check is direct insert into select", KR(ret));
+    const ObDelUpdStmt *stmt = get_stmt();
+    if (OB_ISNULL(stmt)) {
+      ret = OB_ERR_UNEXPECTED;
+      LOG_WARN("get unexpected null", KR(ret), KP(stmt));
+    } else if (OB_FAIL(ObTableDirectInsertService::check_direct_insert(optimizer_context_,
+                                                                      *stmt,
+                                                                      is_direct_insert))) {
+      LOG_WARN("failed to check direct insert", KR(ret));
     } else if (is_direct_insert) {
       // no need building index
       index_cnt = 0;
@@ -2063,28 +2072,3 @@ int ObDelUpdLogPlan::allocate_link_dml_as_top(ObLogicalOperator *&old_top)
   }
   return ret;
 }
-
-int ObDelUpdLogPlan::is_direct_insert_into_select(bool &result)
-{
-  int ret = OB_SUCCESS;
-  const ObDelUpdStmt *stmt = get_stmt();
-  ObSQLSessionInfo* session_info = optimizer_context_.get_session_info();
-  if (OB_ISNULL(stmt) || OB_ISNULL(session_info)) {
-    ret = OB_ERR_UNEXPECTED;
-    LOG_WARN("get unexpected null", KR(ret), KP(stmt), KP(session_info));
-  } else if (stmt::T_INSERT == stmt->stmt_type_
-      && static_cast<const ObInsertStmt*>(stmt)->value_from_select()
-      && GCONF._ob_enable_direct_load
-      && get_optimizer_context().get_global_hint().has_append()
-      && get_optimizer_context().use_pdml()) { // Currently direct-insert only supports pdml
-    // In direct-insert mode, index will be built by direct loader
-    bool auto_commit = false;
-    if (OB_FAIL(session_info->get_autocommit(auto_commit))) {
-      LOG_WARN("failed to get auto commit", KR(ret));
-    } else if (auto_commit && !session_info->is_in_transaction()) {
-      LOG_TRACE("insert into select clause in direct-insert mode, no need building index");
-      result = true;
-    }
-  }
-  return ret;
-}
diff --git a/src/sql/optimizer/ob_del_upd_log_plan.h b/src/sql/optimizer/ob_del_upd_log_plan.h
index bb2d29b6c..33125b4f3 100644
--- a/src/sql/optimizer/ob_del_upd_log_plan.h
+++ b/src/sql/optimizer/ob_del_upd_log_plan.h
@@ -227,8 +227,6 @@ protected:
   virtual int generate_normal_raw_plan() override;
   virtual int generate_dblink_raw_plan() override;
 
-private:
-  int is_direct_insert_into_select(bool &result);
 private:
   DISALLOW_COPY_AND_ASSIGN(ObDelUpdLogPlan);
 
diff --git a/src/sql/optimizer/ob_explain_note.h b/src/sql/optimizer/ob_explain_note.h
index d9415ab46..c5771dd0f 100644
--- a/src/sql/optimizer/ob_explain_note.h
+++ b/src/sql/optimizer/ob_explain_note.h
@@ -31,6 +31,7 @@ namespace sql
 #define PARALLEL_ENABLED_BY_SESSION "Degree of Parallelism is %ld because of session"
 #define PARALLEL_ENABLED_BY_TABLE_PROPERTY "Degree of Parallelisim is %ld because of table property"
 #define PARALLEL_DISABLED_BY_PL_UDF_DAS  "Degree of Parallelisim is %ld because stmt contain pl_udf which force das scan"
+#define DIRECT_MODE_INSERT_INTO_SELECT  "Direct-mode is enabled in insert into select"
 
 }
 }
diff --git a/src/sql/optimizer/ob_optimizer.cpp b/src/sql/optimizer/ob_optimizer.cpp
index fad9f9a77..98c08d8f2 100644
--- a/src/sql/optimizer/ob_optimizer.cpp
+++ b/src/sql/optimizer/ob_optimizer.cpp
@@ -22,6 +22,7 @@
 #include "sql/optimizer/ob_logical_operator.h"
 #include "common/ob_smart_call.h"
 #include "sql/ob_optimizer_trace_impl.h"
+#include "sql/engine/cmd/ob_table_direct_insert_service.h"
 using namespace oceanbase;
 using namespace sql;
 using namespace oceanbase::common;
@@ -675,6 +676,12 @@ int ObOptimizer::init_env_info(ObDMLStmt &stmt)
       ctx_.set_parallel(1);
       ctx_.add_plan_note(PARALLEL_DISABLED_BY_PL_UDF_DAS, 1);
     }
+    bool is_direct_insert = false;
+    if (OB_FAIL(ObTableDirectInsertService::check_direct_insert(ctx_, stmt, is_direct_insert))) {
+      LOG_WARN("failed to check direct insert", KR(ret));
+    } else if (is_direct_insert) {
+      ctx_.add_plan_note(DIRECT_MODE_INSERT_INTO_SELECT);
+    }
   }
 
   // init column usage info