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https://issues.apache.org/jira/browse/FLINK-3002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15003872#comment-15003872
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Fabian Hueske commented on FLINK-3002:
--------------------------------------

I am not exactly sure what you mean.
Type inference should work exactly as with a {{Tuple2<Left, Right>}}, no? For 
tuples the types are defined by the user in the program (through function 
return types) and the TypeExtractor creates the correct TypeInformation. I 
think that should work as well for {{Either<Left, Right>}}.

> Add an EitherType to the Java API
> ---------------------------------
>
>                 Key: FLINK-3002
>                 URL: https://issues.apache.org/jira/browse/FLINK-3002
>             Project: Flink
>          Issue Type: New Feature
>          Components: Java API
>    Affects Versions: 0.10
>            Reporter: Stephan Ewen
>            Assignee: Vasia Kalavri
>             Fix For: 1.0
>
>
> Either types are recurring patterns and should be serialized efficiently, so 
> it makes sense to add them to the core Java API.
> Since Java does not have such a type as of Java 8, we would need to add our 
> own version.
> The Scala API handles the Scala Either Type already efficiently. I would not 
> use the Scala Either Type in the Java API, since we are trying to get the 
> {{flink-java}} project "Scala free" for people that don't use Scala and o not 
> want to worry about Scala version matches and mismatches.



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