Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/6457#issuecomment-141684261
> too many maps: vanzin@e667467
> I think this looks a little bit cleaner and is easier to follow than the
previous code. There are some changes here, particular to the tests, that
should actually be part of the previous commit.
This commit is much simpler. I stole your idea to my latest commit and made
some changes.
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