[FEAT MERGE] Fix the error code loss and overwriting issues on the master branch

Co-authored-by: jingtaoye35 <1255153887@qq.com>
Co-authored-by: fkuner <784819644@qq.com>
Co-authored-by: lucky-sinx <2549261744@qq.com>

src/sql/resolver/dml/ob_default_value_utils.cpp

@@ -604,6 +604,7 @@ int ObDefaultValueUtils::get_default_type_for_default_function_static(
 {
   int ret = OB_SUCCESS;
   if (OB_ISNULL(column_schema)) {
+    ret = OB_ERR_UNEXPECTED;
     LOG_WARN("invalid argument", K(column_schema));
   } else if (column_schema->is_autoincrement()) {
     op = OB_NOT_STRICT_DEFAULT_OP;