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https://issues.apache.org/jira/browse/SPARK-13095?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15131352#comment-15131352
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Apache Spark commented on SPARK-13095:
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User 'davies' has created a pull request for this issue:
https://github.com/apache/spark/pull/11065
> improve performance of hash join with dimension table
> -----------------------------------------------------
>
> Key: SPARK-13095
> URL: https://issues.apache.org/jira/browse/SPARK-13095
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Davies Liu
> Assignee: Davies Liu
>
> The join key is usually an integer or long (primary key, unique), we could
> have special HashRelation for them.
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