diff --git a/src/sql/engine/dml/ob_table_merge_op.cpp b/src/sql/engine/dml/ob_table_merge_op.cpp
index 48e333b2a4..d33b48587d 100644
--- a/src/sql/engine/dml/ob_table_merge_op.cpp
+++ b/src/sql/engine/dml/ob_table_merge_op.cpp
@@ -483,9 +483,13 @@ int ObTableMergeOp::update_row_das()
     } else if (need_after_row_process(*upd_ctdef) && OB_FAIL(dml_modify_rows_.push_back(modify_row))) {
         LOG_WARN("failed to push dml modify row to modified row list", K(ret));
     } else {
-      affected_rows_++;
+      // do nothing
     }
   }
+
+  if (OB_SUCC(ret)) {
+    affected_rows_++;
+  }
   return ret;
 }