Github user manuzhang commented on the issue:
https://github.com/apache/incubator-gearpump/pull/85
@kkasravi
`stream.groupBy` is now a shortcut for
`stream.window(CountWindow.apply(1).triggering(CountTrigger).accumulating).groupBy`.
so `groupBy` has windowing semantics and all window operations should
follow `groupBy`
here is the window semantics
```
- Window
- WindowFn
-> SlidingWindowFn // FixedWindow and SlidingWindow
-> CountWindowFn // CountWindow
- Trigger
-> EventTimeTrigger // event time aggregation
-> ProcessingTimeTrigger // processing time aggregation
-> CountTrigger // count aggregation, used with CountWindowFn
- AccumulationMode
-> Accumulating // states are accumulated across windows
-> Discarding // states are not accumulated
```
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