Github user rxin commented on the pull request:

    https://github.com/apache/spark/pull/10577#issuecomment-169249167
  
    The other thing you gotta be careful with is the performance of 
fold/foldRight/foldLeft/tail/head on these collections. Please make sure we are 
not doing some linear complexity operation in an inner loop and then making 
everything quadratic.



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