Nette\Database\Table\GroupedSelection::order PHP Method

    public function order($columns, ...$params)
    {
        if (!$this->sqlBuilder->getOrder()) {
            // improve index utilization
            $this->sqlBuilder->addOrder("{$this->name}.{$this->column}" . (preg_match('~\\bDESC\\z~i', $columns) ? ' DESC' : ''));
        }
        return parent::order($columns, ...$params);
    }