Github user zhangminglei commented on the issue:
https://github.com/apache/flink/pull/4229
Okay. I really found many ```KeyedDataStream``` terms existing in flink
project under master branch. But there is not a class called it. So, it is very
strange. Also the same stuff refers to ```WindowedDataStream``` in flink. Could
you check it again and makes sure I am correct or incorrect.
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