Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/5608#issuecomment-94741778
I don't understand why you copied and pasted the loop? or why the sampling
size would matter to this degree for correctness.
Is the essence of the change just the check for null? that you don't factor
in the 0 size of null elements into the average? that could make a lot of sense.
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