drillToOverview();
// chart for display of the dataset
final JFreeChart chart = ChartFactory.createPieChart("Value distribution of " + _groupOrColumnName, _dataset, false,
true, false);
Title totalCountSubtitle = new ShortTextTitle("Total count: " + totalCount);
Title distinctCountSubtitle = new ShortTextTitle("Distinct count: " + distinctCount);
chart.setSubtitles(Arrays.asList(totalCountSubtitle, distinctCountSubtitle));
ChartUtils.applyStyles(chart);
// code-block for tweaking style and coloring of chart