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https://issues.apache.org/jira/browse/SPARK-1495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14010932#comment-14010932
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Adrian Wang commented on SPARK-1495:
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Another PR [https://github.com/apache/spark/pull/837] submitted.
> support leftsemijoin for sparkSQL
> ---------------------------------
>
> Key: SPARK-1495
> URL: https://issues.apache.org/jira/browse/SPARK-1495
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Adrian Wang
> Fix For: 1.1.0
>
>
> I created Github PR #395 for this
> issue.[https://github.com/apache/spark/pull/395]
> As marmbrus comments there, one design question is which of the following is
> better:
> 1. multiple operators that handle different kinds of joins, letting the
> planner pick the correct one
> 2. putting the switching logic inside of the operator as is done here
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