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https://issues.apache.org/jira/browse/SPARK-13306?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Davies Liu resolved SPARK-13306.
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Resolution: Fixed
Fix Version/s: 2.0.0
Issue resolved by pull request 11190
[https://github.com/apache/spark/pull/11190]
> Uncorrelated scalar subquery
> ----------------------------
>
> Key: SPARK-13306
> URL: https://issues.apache.org/jira/browse/SPARK-13306
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Reporter: Davies Liu
> Assignee: Davies Liu
> Fix For: 2.0.0
>
>
> A scalar subquery is a subquery that only generate single row and single
> column, could be used as part of expression.
> Uncorrelated scalar subquery means it does not has a reference to external
> table.
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