public function fetchNumericList(\PDOStatement $res)
    {
        $result = new \SplFixedArray($res->rowCount());
        try {
            while ($row = $res->fetch(\PDO::FETCH_NUM)) {
                $result[] = (array)$row;
            }
        } catch (DatabaseException $e) {
            throw $e;
        }

        return $result;
    }