Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/12299#issuecomment-208866819
@mengxr I implemented the suggestion. The sparse case is covered now too,
but, as you say I don't know that there's a faster algorithm for this once the
data is not sparse. I'll do some more thinking/reading. Let's see if this
passes in the meantime.
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