I have read the source code , and found that the JoinedStreams' implementation code is almost the same with CoGroupedStreams' (internally JoinedStreams' implementation is based on CoGroupedStreams). So why we provide two different interface `DataStream.join()` and `DataStream.coGroup()` which are exactly the same ? And the document[1] has not indicated they are doing the same thing. Or is there any differences between `DataStream.join()` and `DataStream.coGroup()` which I missed ? -- Jark Wu
- [QUESTION] the differences between DataStream.join() and Dat... Jark Wu
