Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/1147#issuecomment-50841494
Thanks a lot for working on this! I agree that it would be great to merge
this in before 1.1. I'm a little worried about how much memory this is going
to require. However, the current implementation is so bad and since I think
what you have done here is strictly better, we can probably just merge this in
and then revisit.
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