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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6563) NOT elimination for CASE expressions is broken
Date Wed, 07 May 2014 07:57:26 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13991654#comment-13991654
] 

ASF subversion and git services commented on DERBY-6563:
--------------------------------------------------------

Commit 1592945 from [~knutanders] in branch 'code/trunk'
[ https://svn.apache.org/r1592945 ]

DERBY-6563: NOT elimination for CASE expressions is broken

> NOT elimination for CASE expressions is broken
> ----------------------------------------------
>
>                 Key: DERBY-6563
>                 URL: https://issues.apache.org/jira/browse/DERBY-6563
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.10.2.0
>            Reporter: Knut Anders Hatlen
>            Assignee: Knut Anders Hatlen
>             Fix For: 10.11.0.0
>
>         Attachments: d6563-1a.diff
>
>
> NOT elimination for CASE expressions seems to be broken. Take this example:
> {noformat}
> ij> select * from sysibm.sysdummy1 where not ( case when ibmreqd = 'Y' then true else
true end );
> IBM&
> ----
> Y   
> 1 row selected
> {noformat}
> Both branches of the CASE expression evaluate to TRUE, so one would expect the predicate
"not ( case ... )" to evaluate to FALSE, and the query should return an empty result.



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