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https://issues.apache.org/jira/browse/SPARK-10933?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li closed SPARK-10933.
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Resolution: Won't Fix
> Spark SQL Joins should have option to fail query when row multiplication is
> encountered
> ---------------------------------------------------------------------------------------
>
> Key: SPARK-10933
> URL: https://issues.apache.org/jira/browse/SPARK-10933
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Stephen Link
> Priority: Minor
>
> When constructing spark sql queries, we commonly run into scenarios where
> users have inadvertently caused a cartesian product/row expansion. It is
> sometimes possible to detect this in advance with separate queries, but it
> would be far more ideal if it was possible to have a setting that disallowed
> join keys showing up multiple times on both sides of a join operation.
> This setting would belong in SQLConf. The functionality could likely be
> implemented by forcing a sorted shuffle, then checking for duplication on the
> streamed results.
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