[jira] [Resolved] (SPARK-17298) Require explicit CROSS join for cartesian products by default

["Herman van Hovell (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-17298?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Herman van Hovell resolved SPARK-17298.
---------------------------------------
       Resolution: Fixed
         Assignee: Srinath
    Fix Version/s: 2.1.0

> Require explicit CROSS join for cartesian products by default
> -------------------------------------------------------------
>
>                 Key: SPARK-17298
>                 URL: https://issues.apache.org/jira/browse/SPARK-17298
>             Project: Spark
>          Issue Type: Story
>          Components: SQL
>            Reporter: Srinath
>            Assignee: Srinath
>            Priority: Minor
>             Fix For: 2.1.0
>
>
> Require the use of CROSS join syntax in SQL (and a new crossJoin DataFrame API) to specify explicit cartesian products between relations under the default configuration (spark.sql.crossJoin.enabled = false).
> 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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