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[bugfix][hail][oops] fix region reference counting in new aggregators #6824
I pulled out a flag to cache in java, but accidentally got rid of the thing it was actually doing.
This should be fixed now; with a smaller test mt I'm seeing the number of allocated regions be consistent between combOps:
@chrisvittal I hit a segfault on this PR in the decoder trying to do
The weird thing is that it appears to be sporadic, since it successfully ran all 5 iterations of test 1 and was on the last iteration of test2, judging by the number of spark stages, and it ran successfully when I just ran it a second time.