Github user wuchong commented on the issue:
https://github.com/apache/flink/pull/2938
It's wired. I can't reproduce the wrong results in my local environment.
What is the `data` in your test @twalthr ? I'm using the following data in the
batch and stream test, but the result is same.
```scala
val data = List(
(1L, 1, "Hi"),
(2L, 2, "Hello"),
(4L, 2, "Hello"),
(8L, 3, "Hello world"),
(6L, 3, "Hello world"))
```
cc @fhueske could your help to test this in your environment ?
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