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

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

Knut Anders Hatlen created DERBY-6563:
-----------------------------------------

             Summary: 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


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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