diff --git a/src/sql/optimizer/ob_log_plan.cpp b/src/sql/optimizer/ob_log_plan.cpp
index d4856e4eb1..45daa282de 100644
--- a/src/sql/optimizer/ob_log_plan.cpp
+++ b/src/sql/optimizer/ob_log_plan.cpp
@@ -9503,8 +9503,8 @@ int ObLogPlan::allocate_subplan_filter_as_top(ObLogicalOperator *&top,
     LOG_WARN("get unexpected null", K(top), K(ret));
   } else if (OB_ISNULL(spf_node = static_cast<ObLogSubPlanFilter*>(
                        get_log_op_factory().allocate(*this, LOG_SUBPLAN_FILTER)))) {
-    ret = OB_ERR_UNEXPECTED;
-    LOG_WARN("get unexpected null", K(spf_node), K(ret));
+    ret = OB_ALLOCATE_MEMORY_FAILED;
+    LOG_WARN("failed to allocate memory", K(ret));
   } else if (OB_FAIL(spf_node->add_child(top))) {
     LOG_WARN("failed to add child", K(ret));
   } else if (OB_FAIL(spf_node->add_child(subquery_ops))) {
diff --git a/src/sql/rewrite/ob_transform_pre_process.cpp b/src/sql/rewrite/ob_transform_pre_process.cpp
index 78ad5c991e..f5b96f3a63 100644
--- a/src/sql/rewrite/ob_transform_pre_process.cpp
+++ b/src/sql/rewrite/ob_transform_pre_process.cpp
@@ -4795,6 +4795,7 @@ int ObTransformPreProcess::transform_insert_only_merge_into(ObDMLStmt* stmt, ObD
   int32_t old_bit_id = OB_INVALID_INDEX;
   int32_t new_bit_id = OB_INVALID_INDEX;
   const int64_t TARGET_TABLE_IDX = 0;
+  bool dummy = false;
   if (OB_ISNULL(stmt) || OB_ISNULL(ctx_) ||
       OB_ISNULL(stmt_factory = ctx_->stmt_factory_) ||
       OB_ISNULL(ctx_->allocator_)) {
@@ -4918,6 +4919,8 @@ int ObTransformPreProcess::transform_insert_only_merge_into(ObDMLStmt* stmt, ObD
       LOG_WARN("failed to replace relation exprs", K(ret));
     } else if (OB_FAIL(select_stmt->adjust_subquery_list())) {
       LOG_WARN("failed to adjust subquery list", K(ret));
+    } else if (OB_FAIL(transform_exprs(select_stmt, dummy))) {
+      LOG_WARN("failed to transform exprs", K(ret));
     } else if (OB_FAIL(insert_stmt->adjust_subquery_list())) {
       LOG_WARN("failed to adjust subquery list", K(ret));
     } else {