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https://issues.apache.org/jira/browse/CRUNCH-174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13712091#comment-13712091
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Gabriel Reid commented on CRUNCH-174:
-------------------------------------
Yep, exactly -- I just realized the same thing (or at least that this would
only work if only a single datatype is used).
The union PType sounds like a good plan, but it also sounds like a separate
JIRA. Definitely not worth blocking this one before we have a union type.
With that in mind, +1 for the patch as-is.
> 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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