protected function cleanupRow($row)
    {
        foreach ($row as $key => $column) {
            if ($this->isQuoted($column)) {
                $column = $this->unescape($this->unquote($column));
            }
            if ($this->isSerialized($column)) {
                $column = $this->unserialize($column);
            }
            if ('N;' === $column) {
                $column = null;
            }
            $row[$key] = $column;
        }

        return $row;
    }