Github user s1ck commented on the issue:
> 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`.
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket