srowen commented on pull request #32415:
URL: https://github.com/apache/spark/pull/32415#issuecomment-832721754


   Hm, it does seem very sensitive to partitioning then. That's not good; maybe 
kind of understandable if the data set is so small that each partition has just 
a few elements. The estimates passed around in the EM process here may just be 
wildly different.
   
   Well, I would for the moment simply make the test expect what it's 
returning, and deal with it separately, as I don't think it's related to this 
change.


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