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https://issues.apache.org/jira/browse/SPARK-13304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15154570#comment-15154570
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Apache Spark commented on SPARK-13304:
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User 'davies' has created a pull request for this issue:
https://github.com/apache/spark/pull/11188
> Broadcast join with two ints could be very slow
> -----------------------------------------------
>
> Key: SPARK-13304
> URL: https://issues.apache.org/jira/browse/SPARK-13304
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Davies Liu
>
> If the two join columns have the same value, the hash code of them will be (a
> ^ b), which is 0, then the HashMap will be very very slow.
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