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Posted to issues@spark.apache.org by "Reynold Xin (JIRA)" <ji...@apache.org> on 2016/01/05 22:37:40 UTC

[jira] [Commented] (SPARK-12656) Rewrite Intersect phyiscal plan using semi-join

    [ https://issues.apache.org/jira/browse/SPARK-12656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15083858#comment-15083858 ] 

Reynold Xin commented on SPARK-12656:
-------------------------------------

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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