Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/1704#issuecomment-196325179
Yes I think they will be removed at runtime. Thus, I guess it should also
be fine to test for `isInstanceOf[StreamMap[_, _]]`. If you also want to check
the input/output types properly, then you can use the `TypeInformations` which
are accessible from the `OneInputTransformation`.
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