Github user jkbradley commented on the pull request:

    https://github.com/apache/spark/pull/5946#issuecomment-117798802
  
    @MechCoder Sorry for the long delay!
    
    Responding to your first question which I must have missed before, I am 
worried about trying to vectorize sparse operations.  If you can't see 
significant speedups, it might make sense to leave those parts as they are.
    
    It would be great if you could post timing results here--thanks!


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