public Column setHasLabels(boolean hasLabels) {
        this.hasLabels = hasLabels;
        if (hasLabels) {
            this.hasLabelsOnlyForSelected = false;
        }
        return this;
    }
Single column for ColumnChart. One column can be divided into multiple sub-columns(ColumnValues) especially for
stacked ColumnChart.
Note: you can set X value for columns or sub-columns, columns are by default indexed from 0 to numOfColumns-1 and
column index is used as column X value, so first column has X value 0, second clumn has X value 1 etc.
If you want to display AxisValue for given column you should initialize AxisValue with X value of that column.
hellocharts-library/src/lecho/lib/hellocharts/model/Column.java