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https://issues.apache.org/jira/browse/SPARK-12656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15083858#comment-15083858
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Reynold Xin commented on SPARK-12656:
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cc [~smilegator] one more thing for you to pick up if you are interested.
> Rewrite Intersect phyiscal plan using semi-join
> -----------------------------------------------
>
> Key: SPARK-12656
> URL: https://issues.apache.org/jira/browse/SPARK-12656
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Reynold Xin
>
> Our current Intersect physical operator simply delegates to RDD.intersect. We
> should remove the Intersect physical operator and simply transform a logical
> intersect into a semi-join. This way, we can take advantage of all the
> benefits of join implementations (e.g. managed memory, code generation,
> broadcast joins).
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