Github user s1ck commented on the issue:
https://github.com/apache/flink/pull/2527
> I'm not following why specifying the TypeInformation is now required with
the change to using Either. Is the type system failing to handle this properly?
You are right, I was experimenting with return type definitions for the
groupReduce and the map call. However, for the map call in
`Summarization.java:126` the return type definition is required or the job
fails as it cannot determine the type for `VV`.
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