Github user shixiaogang commented on the issue:
https://github.com/apache/flink/pull/3380
I think we may borrow some ideas from Java. For example, the methods in
`Map` do not throw any exception in their signatures. But the interfaces define
a set of specific `RuntimeException` that can be thrown by the implementation
such as `ClassCastException`. Maybe we can do similarly.
What do you think? @StephanEwen
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