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https://issues.apache.org/jira/browse/SPARK-15425?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-15425:
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Assignee: Apache Spark
> Disallow cartesian joins by default
> -----------------------------------
>
> Key: SPARK-15425
> URL: https://issues.apache.org/jira/browse/SPARK-15425
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Apache Spark
>
> It is fairly easy for users to shoot themselves in the foot if they run
> cartesian joins. Often they might not even be aware of the join methods
> chosen. This happened to me a few times in the last few weeks.
> It would be a good idea to disable cartesian joins by default, and require
> explicit enabling of it via "crossJoin" method or in SQL "cross join". This
> however might be too large of a scope for 2.0 given the timing. As a small
> and quick fix, we can just have a single config option
> (spark.sql.join.enableCartesian) that controls this behavior. In the future
> we can implement the fine-grained control.
> Note that the error message should be friendly and say "Set
> spark.sql.join.enableCartesian to true to turn on cartesian joins."
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