Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/2411
Thanks for the quick fix, @wuchong!
The change looks good, but I just realized that the Java code might be on
purpose in the Scala tab. It shows the interface of the `WindowFunction` which
is defined in Java and the same interface is used by the Scala API. So not sure
if we should translate the code to Scala because a Scala version of the
interface does not exist.
Maybe adding a comment that the Scala API uses Java interfaces is better?
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