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https://issues.apache.org/jira/browse/PIG-4858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15797913#comment-15797913
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Nandor Kollar commented on PIG-4858:
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[~kellyzly] a minor notice: I'm afraid we'll face the same issue with composite
keys as for MR and Tez in PIG-3417. I think we should not flatten the key tuple
(in case of composite key), so instead of foreach(true, true) in
buildMemRowNumForEachForSkewedJoin we should use foreach(false, true) instead.
What do you think?
> Implement Skewed join for spark engine
> --------------------------------------
>
> Key: PIG-4858
> URL: https://issues.apache.org/jira/browse/PIG-4858
> Project: Pig
> Issue Type: Sub-task
> Components: spark
> Reporter: liyunzhang_intel
> Assignee: Xianda Ke
> Fix For: spark-branch
>
> Attachments: PIG-4858.patch, PIG-4858_2.patch, PIG-4858_3.patch,
> SkewedJoinInSparkMode.pdf
>
>
> Now we use regular join to replace skewed join. Need implement it
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