Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/11211#issuecomment-184753632
I think that we need to disable randomness of the hash in order to be able
to safely compare hashcodes which were generated by different Python processes
/ machines.
Could you do a little detective work to look through the Git history and
try to figure out whether this propagation _ever_ worked or determine whether
it was broken recently? If it used to work and was broken only in 1.6 then I
think that there might be another root cause that we should find rather than
patching around this one specific issue in Python.
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