Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/2527
`ToNullValue` is now committed in a new `translator` package in Gelly. I
think that one will be generally very useful.
I created FLINK-4673 so we can look at fixing the type extraction with the
Either type. Using the recently added `TypeInfoFactory` it was quite simple and
I will create the PR after tests pass (I also removed the explicit code from
`TypeExtractor`).
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