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https://issues.apache.org/jira/browse/HIVE-7384?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brock Noland updated HIVE-7384:
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Attachment: sales_stores.txt
sales_products.txt
sales_items.txt
I am using the attached three files when playing around on this issue and the
query:
{noformat}
select * from product join item on (product.product_pk = item.product_pk);
{noformat}
> Research into reduce-side join
> ------------------------------
>
> Key: HIVE-7384
> URL: https://issues.apache.org/jira/browse/HIVE-7384
> Project: Hive
> Issue Type: Sub-task
> Components: Spark
> Reporter: Xuefu Zhang
> Assignee: Brock Noland
> Attachments: sales_items.txt, sales_products.txt, sales_stores.txt
>
>
> Hive's join operator is very sophisticated, especially for reduce-side join.
> While we expect that other types of join, such as map-side join and SMB
> map-side join, will work out of the box with our design, there may be some
> complication in reduce-side join, which extensively utilizes key tag and
> shuffle behavior. Our design principle prefers to making Hive implementation
> work out of box also, which might requires new functionality from Spark. The
> tasks is to research into this area, identifying requirements for Spark
> community and the work to be done on Hive to make reduce-side join work.
> A design doc might be needed for this. For more information, please refer to
> the overall design doc on wiki.
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