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Posted to issues@spark.apache.org by "Wenchen Fan (JIRA)" <ji...@apache.org> on 2017/07/07 04:03:00 UTC

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

Wenchen Fan created SPARK-21335:
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             Summary: 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 synatax, 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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