Github user erikerlandson commented on the pull request:

    https://github.com/apache/spark/pull/1964#issuecomment-53581400
  
    It seems most elegant and scala-like to directly supply the distance 
function as the parameter, instead of just a 'type' that selects some internal 
function.  If you don't like one of the pre-defined distance functions, write 
your own and use it as the parameter.


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