Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/598#issuecomment-101321028
I had a look at this, and it actually looks quite good. The basic idea
seems to be that you emit the original vertex if no update happens.
It would be nice to not have the `isLastCollected` flag in the user-facing
classes. If you could have a dedicated vertex-centric bulk coGroup, with its
own output collector, you can track this in the OutputCollector. I think that
would be cleanrer with respect to the user-facing API.
Otherwise, I think this is a good addition...
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