Github user orhankislal commented on the issue:
https://github.com/apache/madlib/pull/269
Thanks for your comments Frank. Regarding the accuracy, I have tested the
code with multiple groups from multiple grouping columns with hand-calculated
values (as seen in the install-check). I have also tried a larger dataset (600
columns). I have duplicated the data to create multiple columns and checked to
see if the results match across groups. Please let us know if you have any
other suggestions.---
