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https://issues.apache.org/jira/browse/SPARK-2366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14052265#comment-14052265
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Takuya Ueshin commented on SPARK-2366:
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PRed: https://github.com/apache/spark/pull/1301
> Add column pruning for the right side of LeftSemi join.
> -------------------------------------------------------
>
> Key: SPARK-2366
> URL: https://issues.apache.org/jira/browse/SPARK-2366
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Takuya Ueshin
>
> The right side of {{LeftSemi}} join needs columns only used in join condition.
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