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https://issues.apache.org/jira/browse/SPARK-21335?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-21335:
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Assignee: Wenchen Fan (was: Apache Spark)
> support un-aliased subquery
> ---------------------------
>
> Key: SPARK-21335
> URL: https://issues.apache.org/jira/browse/SPARK-21335
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Wenchen Fan
> Assignee: Wenchen Fan
>
> un-aliased subquery is supported by Spark SQL for a long time. Its semantic
> was not well defined and has confusing behaviors, and it's not a standard SQL
> syntax, so we disallowed it in
> https://issues.apache.org/jira/browse/SPARK-20690 .
> However, this is a breaking change, and we do have existing queries using
> un-aliased subquery. We should add the support back and fix its semantic.
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