The problem is that with Union, AggregateInfo.materializeRequiredSlots() is being called more than once.
Other "materializeSlots" related calls are idempotent, but this one is not.
That's because materializedAggregateSlots_ is an array list and we keep adding the same duplicate value
to the array list. We can fix it by making materializeRequiredSlots() idempotent.
Change-Id: Ic18f89010c088fe9018b15f0281bc9340b8a2d14
Reviewed-on: http://gerrit.ent.cloudera.com:8080/1195
Tested-by: jenkins
Reviewed-by: Alan Choi <alan@cloudera.com>
Tested-by: Alan Choi <alan@cloudera.com>
468ca0aa5d