Github user aljoscha commented on the pull request: https://github.com/apache/flink/pull/202#issuecomment-76981299 You could call it CoGroupRaw, just an idea... Once that and the split into the python and generic part is done I vote for merging this. The API looks good and other stuff, such as getting rid of the type annotations can be worked on afterwards. I think it would be good to get people that are interested to try it out. Also, the code is very well commented and documented. :smile_cat:
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