Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/1977#issuecomment-55958996
This looks like a good patch. The code here is fairly complicated and had
some complex control flow, although after discussion I believe that it works
correctly. It would be great if you could add some more comments explaining,
say, which parts of the code are only called once, which branches are taken
under which scenarios, etc.
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