wangyuhu updated SPARK-9862:
    Attachment: Handling skew data in join.pdf

> Join: Handling data skew
> ------------------------
>                 Key: SPARK-9862
>                 URL: https://issues.apache.org/jira/browse/SPARK-9862
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>            Reporter: Yin Huai
>         Attachments: Handling skew data in join.pdf
> For a two way shuffle join, if one or multiple groups are skewed in one table 
> (say left table) but having a relative small number of rows in another table 
> (say right table), we can use broadcast join for these skewed groups and use 
> shuffle join for other groups.

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