Github user hvanhovell commented on the pull request:
https://github.com/apache/spark/pull/8362#issuecomment-142323666
@MLnick I am in the process of moving house, so I am a bit slow/late with
my response :(...
I think it is very usefull to be able to return the HLL registers to the
users (it could also be nice to use in cost based planning). I would rather
give it a different name though ```createHLLRegisters``` for instance (the name
needs work), to make it clear that we are doing something different.
The UDAF should support a rsd parameter. Doesn't it? I'll add a test.
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