Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/1390#issuecomment-48930414
Thanks for reviewing this everyone. I'm all for commenting and cleaning
things up here, but if possible I'd like to merge this in today. There are a
couple of people blocking on this as its a pretty severe performance bug. How
about we just add some TODOs that can be taken care of in a follow up PR?
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