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https://issues.apache.org/jira/browse/HIVE-8202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14191380#comment-14191380
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Szehon Ho commented on HIVE-8202:
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Thanks, Xuefu
> Support SMB Join for Hive on Spark [Spark Branch]
> -------------------------------------------------
>
> Key: HIVE-8202
> URL: https://issues.apache.org/jira/browse/HIVE-8202
> Project: Hive
> Issue Type: Sub-task
> Components: Spark
> Reporter: Xuefu Zhang
> Assignee: Szehon Ho
> Fix For: spark-branch
>
> Attachments: HIVE-8202.1-spark.patch, HIVE-8202.2-spark.patch,
> HIVE-8202.3-spark.patch, HIVE-8202.4-spark.patch, HIVE-8202.5-spark.patch,
> HIVE-8202.6-spark.patch, HIVE-8202.7-spark.patch, HIVE-8202.8-spark.patch,
> HIVE-8202.9-spark.patch, Hive on Spark SMB Join.docx, Hive on Spark SMB
> Join.pdf
>
>
> SMB joins are used wherever the tables are sorted and bucketed. It's a
> map-side join. The join boils down to just merging the already sorted tables,
> allowing this operation to be faster than an ordinary map-join.
> The task is to research and support the conversion from regular SMB join to
> SMB map join for Spark execution engine.
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