Github user davies commented on the pull request:
https://github.com/apache/spark/pull/1371#issuecomment-48787408
@mateiz If there is None in Tuple, such as (None, 3), the hash of it will
be different cross machines.
If user provide a partitionFunc, which uses hash() in it, then it will have
problem.
This hack does not look good for me. Maybe we just use this portable hash
as default one?
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