Piwik\DataTable\Filter\PivotByDimension::getNameOfFirstNonLabelColumnInTable PHP Method

    private function getNameOfFirstNonLabelColumnInTable(DataTable $table)
    {
        foreach ($table->getRows() as $row) {
            foreach ($row->getColumns() as $columnName => $ignore) {
                if ($columnName != 'label') {
                    return $columnName;
                }
            }
        }
    }