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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2017/07/07 04:09:00 UTC

[jira] [Assigned] (SPARK-21335) support un-aliased subquery

     [ https://issues.apache.org/jira/browse/SPARK-21335?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-21335:
------------------------------------

    Assignee: Apache Spark  (was: Wenchen Fan)

> 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: Apache Spark
>
> 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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