diff --git a/src/sql/engine/expr/ob_expr_xml_attributes.cpp b/src/sql/engine/expr/ob_expr_xml_attributes.cpp
index 28d5fc2831..090f096c09 100644
--- a/src/sql/engine/expr/ob_expr_xml_attributes.cpp
+++ b/src/sql/engine/expr/ob_expr_xml_attributes.cpp
@@ -58,6 +58,9 @@ int ObExprXmlAttributes::calc_result_typeN(ObExprResType &type,
           ret = OB_ERR_INVALID_XML_DATATYPE;
           LOG_USER_ERROR(OB_ERR_INVALID_XML_DATATYPE, "-", ob_obj_type_str(types_stack[i].get_type()));
           LOG_WARN("invalid type, expect char", K(ret), K(types_stack[i].get_type()));
+        } else if (ob_is_nstring(types_stack[i].get_type())) {
+          types_stack[i].set_calc_type(ObVarcharType);
+          types_stack[i].set_calc_collation_type(CS_TYPE_UTF8MB4_BIN);
         } else if (types_stack[i].get_charset_type() != CHARSET_UTF8MB4) {
           types_stack[i].set_calc_collation_type(CS_TYPE_UTF8MB4_BIN);
         }
diff --git a/src/sql/resolver/expr/ob_raw_expr_printer.cpp b/src/sql/resolver/expr/ob_raw_expr_printer.cpp
index f399ab8444..541bfdfe61 100644
--- a/src/sql/resolver/expr/ob_raw_expr_printer.cpp
+++ b/src/sql/resolver/expr/ob_raw_expr_printer.cpp
@@ -4623,8 +4623,7 @@ int ObRawExprPrinter::print_xml_attributes_expr(ObSysFunRawExpr *expr)
           PRINT_EXPR(expr->get_param_expr(i));
           ObObj attr_key_obj = static_cast<ObConstRawExpr*>(expr->get_param_expr(i + 1))->get_value();
           ObItemType expr_type = expr->get_param_expr(i + 1)->get_expr_type();
-          if (expr_type == T_REF_COLUMN ||
-              expr_type == T_FUN_SYS_CAST ||
+          if ((T_VARCHAR != expr_type && T_CHAR != expr_type) ||
               attr_key_obj.get_type() == ObObjType::ObUnknownType) {
             DATA_PRINTF(" as evalname ");
             PRINT_EXPR(expr->get_param_expr(i + 1));