private function render($row = 0)
    {
        if ($this->output->getVerbosity() >= OutputInterface::VERBOSITY_VERBOSE) {
            $rows = ($this->showSummary ? array_merge($this->rows, [$this->getSummary()]) : $this->rows);
            $this->output->reWrite($rows, !$this->showSummary);
        } else {
            $this->output->writeln($this->rows[$row]);
        }
    }