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https://issues.apache.org/jira/browse/SPARK-8300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14581198#comment-14581198
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Apache Spark commented on SPARK-8300:
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User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/6751
> DataFrame hint for broadcast join
> ---------------------------------
>
> Key: SPARK-8300
> URL: https://issues.apache.org/jira/browse/SPARK-8300
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
>
> It is not always possible to have perfect cardinality estimation. We should
> allow users to give hint to the optimizer to do broadcast join.
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