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Posted to derby-dev@db.apache.org by "Mike Matrigali (JIRA)" <ji...@apache.org> on 2014/10/10 01:05:34 UTC
[jira] [Reopened] (DERBY-6563) NOT elimination for CASE expressions
is broken
[ https://issues.apache.org/jira/browse/DERBY-6563?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mike Matrigali reopened DERBY-6563:
-----------------------------------
Assignee: Mike Matrigali (was: Knut Anders Hatlen)
reopening for 10.10 backport, temp assigning myself while working on this.
> 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: Mike Matrigali
> Fix For: 10.11.1.1
>
> 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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