Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/1104#issuecomment-138573293
Is it really necessary to discuss an obvious bug on the mailing list? The
`EitherTypeInfo` suffers from the same problem and, thus, it seams to be a
systematic error. In order to prevent future mistakes like this, I don't see a
different way than making the developer aware that he has to implement these
methods.
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