Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/2982
Thanks for looking at that! I'll open a new discussion thread on the
Mailing lists to discuss Side Outputs and split/select and how we're going to
proceed with that.
Regarding your other questions: I think we might add such an `Evaluator`
interface in the future but for now I would like to keep it simple and see if
that works for people. And yes, a user would have to use `allowedLateness` and
`sideOutputLateData` at the same time if they want to use late data, or they
can go with the default allowed lateness of zero and also get the late data as
a side output.
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