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https://issues.apache.org/jira/browse/TEZ-678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13888223#comment-13888223
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Siddharth Seth commented on TEZ-678:
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tez-api/Vertex still has some additional methods which aren't really used -
add/getGroupInput, removeInput/OutputVertex.
In terms of the transitions - it's not really related to this patch. Created
TEZ-785 for that.
Other than that, looks good.
> Support for union operations
> ----------------------------
>
> Key: TEZ-678
> URL: https://issues.apache.org/jira/browse/TEZ-678
> Project: Apache Tez
> Issue Type: Improvement
> Reporter: Bikas Saha
> Assignee: Bikas Saha
> Attachments: TEZ-678.1.patch, TEZ-678.2.patch, TEZ-678.3.patch,
> TEZ-678.4.patch, TEZ-678.5.patch, TEZ-678.6.patch, TEZ-678.7.patch,
> TEZ-678.8.patch
>
>
> Unions represent a collection of results obtained from different branches of
> computation. The collection is a virtual operation that does not need to
> execute any tasks. Subsequent operations can conveniently work on the union
> named data set instead of each individual member of the union. While unions
> can be implemented efficiently without additional support from Tez, having
> API support can make it easier and less error-prone to implement.
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