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https://issues.apache.org/jira/browse/SPARK-7109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14510417#comment-14510417
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Apache Spark commented on SPARK-7109:
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User 'scwf' has created a pull request for this issue:
https://github.com/apache/spark/pull/5677
> Push down left side filter for left semi join
> ---------------------------------------------
>
> Key: SPARK-7109
> URL: https://issues.apache.org/jira/browse/SPARK-7109
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.3.1
> Reporter: Fei Wang
>
> now in spark sql optimizer we only push down right side filter, actually we
> can push down left side filter for left semi join
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