hpcc-systems/HPCC-Platform — pull request #3464 by jakesmith (2012-10-04 10:58:28+00:00)
Title: HPCC-7956 Group Hash Aggregate failure

Hash aggregate was incorrectly testing the grouped state of the activity
As a consequence, it was running global distribute code and hit an assert
upon trying to use a null MP tag.

Signed-off-by: Jake Smith