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https://issues.apache.org/jira/browse/SPARK-11512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14990868#comment-14990868
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Cheng Hao commented on SPARK-11512:
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We need to support the "bucket" for DataSource API.
> Bucket Join
> -----------
>
> Key: SPARK-11512
> URL: https://issues.apache.org/jira/browse/SPARK-11512
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Cheng Hao
>
> Sort merge join on two datasets on the file system that have already been
> partitioned the same with the same number of partitions and sorted within
> each partition, and we don't need to sort it again while join with the
> sorted/partitioned keys
> This functionality exists in
> - Hive (hive.optimize.bucketmapjoin.sortedmerge)
> - Pig (USING 'merge')
> - MapReduce (CompositeInputFormat)
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