Github user mgaido91 commented on the issue:

    https://github.com/apache/spark/pull/22360
  
    Thanks for pinging me @srowen.
    
    > But I don't see that its getDistanceMeasure would actually return the 
value inside that wrapped model? I am missing where the wrapper gets updated to 
return the actual distance measure used.
    
    Yes, that is the reason that `setDistanceMeasure` was introduces IIRC. So 
probably the issue here is that is never set. It would be good if we can add a 
test for this if there is no-one.


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