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https://issues.apache.org/jira/browse/SPARK-17298?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated SPARK-17298:
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    Priority: Minor  (was: Major)

Hm, aren't you suggesting that cartesian joins be _allowed_ when explicitly 
requested, regardless of the global flag? that's not the same as requiring this 
syntax, which probably isn't feasible as it would break things.

> Require explicit CROSS join for cartesian products
> --------------------------------------------------
>
>                 Key: SPARK-17298
>                 URL: https://issues.apache.org/jira/browse/SPARK-17298
>             Project: Spark
>          Issue Type: Story
>          Components: SQL
>            Reporter: Srinath
>            Priority: Minor
>
> Require the use of CROSS join syntax in SQL (and a new crossJoin DataFrame 
> API) to specify explicit cartesian products between relations.
> By cartesian product we mean a join between relations R and S where there is 
> no join condition involving columns from both R and S.
> If a cartesian product is detected in the absence of an explicit CROSS join, 
> an error must be thrown. Turning on the spark.sql.crossJoin.enabled 
> configuration flag will disable this check and allow cartesian products 
> without an explicit cross join.



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