hpcc-systems/HPCC-Platform — pull request #3530 by jakesmith (2012-10-17 11:21:57+00:00)
Title: HPCC-7956 Implement grouped version of hash aggregate and hash dedup

Implement grouped version of hash aggregate and hash dedup.

And, 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