diff --git a/src/sql/engine/expr/ob_expr_reverse.h b/src/sql/engine/expr/ob_expr_reverse.h
index 3d95d43b7..5f72eb316 100644
--- a/src/sql/engine/expr/ob_expr_reverse.h
+++ b/src/sql/engine/expr/ob_expr_reverse.h
@@ -72,6 +72,7 @@ inline int ObExprReverse::calc_result_type1(ObExprResType &type,
       type.set_collation_type(type1.get_collation_type());
       type.set_collation_level(type1.get_collation_level());
       type.set_length(type1.get_length());
+      type.set_length_semantics(type1.get_length_semantics());
     } else {
       ret = OB_ERR_INVALID_TYPE_FOR_OP;
       LOG_USER_ERROR(OB_ERR_INVALID_TYPE_FOR_OP,