According to the documentation, Org Charts only support 3 columns: node ID,
parent node ID, and tooltip text.
Do you need those columns when you actually draw the Org Chart, or are they
for some control/other chart? If you don't need them at the time you draw
the chart, you can create a data view, and draw the chart with that instead:
var view = new google.visualization.DataView(data);
view.setColumns([0,1,2]);
var chart = new
google.visualization.OrgChart(document.getElementById('chart_div'));
chart.draw(view, <options>);
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