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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-6983) Support SELECT * for IN predicate subqueries when it is "obvious" that the asterisk expands to exactly one column
Date Mon, 26 Feb 2018 12:31:00 GMT

     [ https://issues.apache.org/jira/browse/DERBY-6983?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rick Hillegas updated DERBY-6983:
---------------------------------
               Urgency: Normal
    Bug behavior facts: Deviation from standard,Seen in production
      Issue & fix info: Workaround attached

> Support SELECT * for IN predicate subqueries when it is "obvious" that the asterisk expands
to exactly one column
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-6983
>                 URL: https://issues.apache.org/jira/browse/DERBY-6983
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.14.1.0
>            Reporter: Lukas Eder
>            Priority: Major
>
> The following query is not allowed in Derby:
> {code:java}
> SELECT *
> FROM sys.systables
> WHERE tablename IN (
>   SELECT *
>   FROM (
>     SELECT 'SYSTABLES' t
>     FROM sysibm.sysdummy1
>   ) t
> ){code}
> The error I'm getting is:
> {code:java}
> 'SELECT *' only allowed in EXISTS and NOT EXISTS subqueries.{code}
> In this case, it is "obvious" that the asterisk (also a qualified asterisk: t.*) expands
to exactly one column and the query should be perfectly fine. I'm not aware of any other databases
with such a restriction.
>  



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