Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/4238#issuecomment-71906107
Nice fix. The old code incorrectly assumed that there was a 1-to-1
correspondence between tasks and partitions, which isn't true for `coalesce`.
I left two minor comments related to variable naming and code comments, since
this is tricky code that could benefit from more explicit comments.
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