madlib/madlib — pull request #142 by renyi533 (2012-05-09 09:53:14+00:00)
Title: Madlib 489

Resolve madlib-489.

During generating ACS sets, we should filter null values out. Otherwise, we get in some garbage data. Furthermore, we use ordered aggregate to compute the best split. With these garbage data, the sort order is not fixed now. So the results are not consistent for multiple runs.