void Item_insert_value::print(String *str, enum_query_type query_type)
{
  str->append(STRING_WITH_LEN("value("));
  arg->print(str, query_type);
  str->append(')');
}
void Item_insert_value::print(String *str, enum_query_type query_type)
{
  str->append(STRING_WITH_LEN("value("));
  arg->print(str, query_type);
  str->append(')');
}