pie chart 3 data colomn its not working plis help

[yoga alfian]

i want to show 3 data colomn in pie chart, but just showing 2 colomn. if i used bar, its working. i want to showing storage_type,storage_used and storage_free but just storage_type and storage_used.but if i test with bar chart its working, but cannot working with pie chart.

this is my db

this is my output

<?Php
require "configdashboard.php";// Database connection

if($stmt = $connection->query("SELECT ,storage_used,storage_free FROM storage WHERE storage_type ='fujitsu'")){
   while ($row = $stmt->fetch_row()) {
   $php_data_array[] = $row; // Adding to array
   }}
   
   echo "<script>
        var my_2d = ".json_encode($php_data_array)."
   </script>";
?>

<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
                        <script type="text/javascript">

// Load the Visualization API and the corechart package.
                                google.charts.load('current', {packages: ['corechart']});
                                google.charts.setOnLoadCallback(drawChart);
          
                                function drawChart() {

                                        // Create the data table.
                                        var data = new google.visualization.DataTable();
                                        data.addColumn('string', 'type');
                                        data.addColumn('number', 'used');
                                        data.addColumn('number', 'free');
                
                                        for(i = 0; i < my_2d.length; i++)
                                        data.addRow([my_2d[i][0], parseInt(my_2d[i][1]),parseInt(my_2d[i][2])]);
                                        var options = {                         
                                        };

                
                                        var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
                                        chart.draw(data, options);
                                }

</script>

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