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https://issues.apache.org/jira/browse/SPARK-1271?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Wendell updated SPARK-1271:
-----------------------------------

    Description: This API change will allow us to externalize these things down 
the road. Note that this will be a backwards incompatible change for users, but 
the solution is very simple, in cases where previously `Seq`'s were expected, 
the user can just call `toSeq` on the iterable.  (was: This API change will 
allow us to externalize these things down the road.)

> Use Iteratable[X] in co-group and group-by signatures
> -----------------------------------------------------
>
>                 Key: SPARK-1271
>                 URL: https://issues.apache.org/jira/browse/SPARK-1271
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>            Reporter: Patrick Wendell
>            Priority: Blocker
>             Fix For: 1.0.0
>
>
> This API change will allow us to externalize these things down the road. Note 
> that this will be a backwards incompatible change for users, but the solution 
> is very simple, in cases where previously `Seq`'s were expected, the user can 
> just call `toSeq` on the iterable.



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