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https://issues.apache.org/jira/browse/CRUNCH-174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13712085#comment-13712085
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Josh Wills commented on CRUNCH-174:
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I agree with that; the trick as I see it is that we don't have a notion of a
PType<Union<A, B, ...>> at this point. Adding one for Avro is really
straightforward; adding one for Writables is a little bit more interesting (but
not that bad). I think we would just need to agree on what the Union class(es)
looked like and where they would live in the package hierarchy.
> Add support for join3 and cogroup3
> ----------------------------------
>
> Key: CRUNCH-174
> URL: https://issues.apache.org/jira/browse/CRUNCH-174
> Project: Crunch
> Issue Type: Bug
> Components: Core, MapReduce Patterns
> Reporter: Josh Wills
> Assignee: Josh Wills
> Attachments: CRUNCH-174.patch
>
>
> This seemed like a nice starter JIRA: it would be great to have the three
> (and even four!) argument analogues of Join.join() and Cogroup.cogroup(),
> something like:
> PTable<K, Tuple3<V1, V2, V3>> j = Join.join(PTable<K, V1> a, PTable<K, V2> b,
> PTable<K, V3> c);
> ... and similar for co-groups.
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