[jira] [Resolved] (DERBY-6563) NOT elimination for CASE expressions is broken

["Knut Anders Hatlen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DERBY-6563?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Knut Anders Hatlen resolved DERBY-6563.
---------------------------------------

          Resolution: Fixed
       Fix Version/s: 10.11.0.0
    Issue & fix info: Repro attached  (was: Patch Available,Repro attached)

Thanks for reviewing the patch, Dag!

> 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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