Github user freeman-lab commented on the pull request:
https://github.com/apache/spark/pull/5267#issuecomment-96512684
@yu-iskw I'm still going through the patch, but so far it's looking good!
I've also been testing it locally.
Is there a reason you removed the `toMergeList` method from the previous
version of this submission? That seemed quite useful to me, as it's a common
way to describe the output of hierarchical clustering, both in formal
treatments as well as in other analysis libraries (though I do suggest naming
it `toLinkageMatrix`). What do you think about bringing it back?
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