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https://issues.apache.org/jira/browse/SPARK-17079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16161136#comment-16161136
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Zhenhua Wang commented on SPARK-17079:
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This is inherently done in SparkStrategies.
> broadcast decision based on cbo
> -------------------------------
>
> Key: SPARK-17079
> URL: https://issues.apache.org/jira/browse/SPARK-17079
> Project: Spark
> Issue Type: Sub-task
> Components: Optimizer
> Affects Versions: 2.0.0
> Reporter: Ron Hu
>
> We decide if broadcast join should be used based on the cardinality and size
> of join input side rather than the initial size of the join base relation.
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