[jira] [Commented] (PIG-4858) Implement Skewed join for spark engine

["Nandor Kollar (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PIG-4858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15797913#comment-15797913 ] 

Nandor Kollar commented on PIG-4858:
------------------------------------

[~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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