[jira] [Updated] (SPARK-14004) NamedExpressions should have at most one qualifier

["Yin Huai (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-14004?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yin Huai updated SPARK-14004:
-----------------------------
    Summary: NamedExpressions should have at most one qualifier  (was: AttributeReference and Alias should only use their first qualifier to build SQL representations)

> NamedExpressions should have at most one qualifier
> --------------------------------------------------
>
>                 Key: SPARK-14004
>                 URL: https://issues.apache.org/jira/browse/SPARK-14004
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.0.0
>            Reporter: Cheng Lian
>            Assignee: Cheng Lian
>            Priority: Minor
>             Fix For: 2.0.0
>
>
> Current implementation joins all qualifiers, which is wrong.
> However, this doesn't cause any real SQL generation bugs as there is always at most one qualifier for any given {{AttributeReference}} or {{Alias}}.
> We can probably use {{Option\[String\]}} instead of {{Seq\[String\]}} to represent qualifiers.



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