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https://issues.apache.org/jira/browse/PIG-4601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14906474#comment-14906474
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Xuefu Zhang commented on PIG-4601:
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I don't think so. It's unsigned. Please feel free to take it.
> Implement Merge CoGroup for Spark engine
> ----------------------------------------
>
> Key: PIG-4601
> URL: https://issues.apache.org/jira/browse/PIG-4601
> Project: Pig
> Issue Type: Sub-task
> Components: spark
> Affects Versions: spark-branch
> Reporter: Mohit Sabharwal
> Fix For: spark-branch
>
>
> Implement single-stage ("map-side") co-group where all the input data sets
> are sorted by key:
> {code}
> C = cogroup A by c1, B by c1 using 'merge';
> {code}
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