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https://issues.apache.org/jira/browse/SPARK-12385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15071665#comment-15071665
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Apache Spark commented on SPARK-12385:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/10476
> Push projection into Join
> -------------------------
>
> Key: SPARK-12385
> URL: https://issues.apache.org/jira/browse/SPARK-12385
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Davies Liu
>
> We usually have Join followed by a projection to pruning some columns, but
> Join already have a result projection to produce UnsafeRow, we should combine
> them together.
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