Nette\Database\Table\Selection::getPreviousAccessedColumns PHP 메소드

    public function getPreviousAccessedColumns()
    {
        if ($this->cache && $this->previousAccessedColumns === NULL) {
            $this->accessedColumns = $this->previousAccessedColumns = $this->cache->load($this->getGeneralCacheKey());
            if ($this->previousAccessedColumns === NULL) {
                $this->previousAccessedColumns = [];
            }
        }
        return array_keys(array_filter((array) $this->previousAccessedColumns));
    }