Today we are introducing an important new feature - the ability to provide custom value comparison function that is used for sorting the column. The following script demonstrates the concept, all that is needed is to set column.valueComparer:
// Providing custom comparer function
// Let's say we have a string column where values have some logical order
let column = DG.Column.fromList(DG.TYPE.STRING, 'months', ['Feb', 'Jan', 'May', 'Mar']);
// Define and set a custom value comparer that is used for sorting later
let months = { Jan: 1, Feb: 2, Mar: 3, Apr: 4, May: 5 };
column.valueComparer = (s1, s2) => months[s1] - months[s2];
// It is possible to get the sorted order if needed
let order = column.getSortedOrder();
grok.shell.info(Array.from(order).map((i) => column.get(i)).join(', '));
// Or, simply double-click on the header to sort it visually
grok.shell.addTableView(DG.DataFrame.fromColumns([column]));
Once a value comparer is defined for a column, it gets used by all visualizations, and for other purposes such as aggregation as well. Check out the screenshot below (a result of running the script above) and note the proper sorted order on all charts:
@nico.pulver.novartis.com, @nikolaus.stiefl.novartis.com, @ptosco, @timothy.danford.novartis.com - I believe you have plenty of applications for that feature 