protected function _truncate()
    {
        if (!$this->getLimit()->isNull()) {
            if (is_null($this->getLimit()->getCount())) {
                $this->_output = array_splice($this->_output, $this->getLimit()->getStart());
            } else {
                $this->_output = array_splice($this->_output, $this->getLimit()->getStart(), $this->getLimit()->getCount());
            }
        }
    }