Method create_tmp_field_ex

sql/sql_select.cc:21728–21741

Field *Item_field::create_tmp_field_ex(MEM_ROOT *root, TABLE *table,
                                       Tmp_field_src *src,
                                       const Tmp_field_param *param)
{
  DBUG_ASSERT(!is_result_field());
  Field *result;
  src->set_field(field);
  if (!(result= create_tmp_field_from_item_field(root, table, NULL, param)))
    return NULL;
  if (!(field->flags & NO_DEFAULT_VALUE_FLAG) &&
      field->eq_def(result))
    src->set_default_field(field);
  return result;
}


Field *Item_default_value::create_tmp_field_ex(MEM_ROOT *root, TABLE *table,