Github user tzulitai commented on the issue:
https://github.com/apache/flink/pull/3314
LGTM, I'll proceed to merge this later today.
One minor problem: the offset state still isn't updated if `record ==
null`. We need to do the checking in the synchronize block in the `emitRecord*`
methods.
It's a simple fix, so I can do it while merging :-)
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