computeGroupings
int[] computeGroupings(List<String> columns)
Computes the groupings of the underlying rows based on the columns passed in for grouping. The grouping is
returned as an int[], the length of the array will be equal to the number of rows of data and the values of
the elements of the array will be the same when the rows are part of the same group and different when the
rows are part of different groups. This is contrasted with the SortedGroupPartitioner in that, the
groupings returned are not necessarily contiguous. There is also no sort-order implied by the `int` values
assigned to each grouping.
- Parameters:
columns - the columns to group with- Returns:
- the groupings, rows with the same int value are in the same group. There is no sort-order implied by the
int values.