protected function _renderLimitoffset($sql)
    {
        $count = 0;
        $offset = 0;

        if (!empty($this->_parts[self::LIMIT_OFFSET])) {
            $offset = (int) $this->_parts[self::LIMIT_OFFSET];
            $count = PHP_INT_MAX;
        }

        if (!empty($this->_parts[self::LIMIT_COUNT])) {
            $count = (int) $this->_parts[self::LIMIT_COUNT];
        }

        /*
         * Add limits clause
         */
        if ($count > 0) {
            $sql = trim($this->_adapter->limit($sql, $count, $offset));
        }

        return $sql;
    }