Github user srowen commented on the issue:
https://github.com/apache/spark/pull/15341
Possibly @MLnick would have some thoughts on this one. I know there's a lot
going on here but mostly it's deletion and comments. The math changes are
probably best proven by the unit tests. I think the tests showed the current
behavior is definitely off.
CCing @mateiz just because he was the last person to touch this code
apparently, but, that was on initial import years ago.
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