Github user rmetzger commented on the pull request:
https://github.com/apache/flink/pull/659#issuecomment-99888405
I agree with Marton's comments.
The change is quite massive. Maybe it would be a good idea to throw
everything onto a cluster and verify that everything is still working.
In particular the whole reachedEnd()/next() stuff is prone to fail with
off-by-one errors ...
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