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https://issues.apache.org/jira/browse/SPARK-13213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15155438#comment-15155438
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Davies Liu commented on SPARK-13213:
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It depends, I'm open to any reasonable solution.
> BroadcastNestedLoopJoin is very slow
> ------------------------------------
>
> Key: SPARK-13213
> URL: https://issues.apache.org/jira/browse/SPARK-13213
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Davies Liu
>
> Since we have improve the performance of CartisianProduct, which should be
> faster and robuster than BroacastNestedLoopJoin, we should do
> CartisianProduct instead of BroacastNestedLoopJoin, especially when the
> broadcasted table is not that small.
> Today, we hit a query that take very long time but still not finished, once
> decrease the threshold for broadcast (disable BroacastNestedLoopJoin), it
> just finished in seconds.
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