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From "A B (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-1620) SQL CASE statement returns ERROR 42X89 when including NULL as a return value
Date Mon, 19 Mar 2007 23:41:33 GMT

    [ https://issues.apache.org/jira/browse/DERBY-1620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12482267
] 

A B commented on DERBY-1620:
----------------------------

Oops, somehow I unassigned John Peterson from this issue (sorry!).  I tried to reassign it
back to him but he doesn't show up on the available list.  John, please re-assign this issue
back to you when you have the chance.  Sorry for the slip-up...not sure how that happened...

> SQL CASE statement returns ERROR 42X89 when including NULL as a return value
> ----------------------------------------------------------------------------
>
>                 Key: DERBY-1620
>                 URL: https://issues.apache.org/jira/browse/DERBY-1620
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.2.1.6
>         Environment: Windows XP
>            Reporter: John Peterson
>            Priority: Minor
>             Fix For: 10.3.0.0
>
>         Attachments: ConditionalNode.diff, ConditionalNode.diff, ConditionalNode.diff,
Derby_Community_Discussion.doc, derbyall_report.txt, resultset.tmp, resultset.tmp, sysinfo_and_example.txt
>
>
> This bug appears to be related to the DERBY-7 bug (NULLIF() function).   When NULL is
used during a CASE statement, Derby requires the NULL to be CAST to the appropriate type.
 This does not appear to meet the SQL 2003 Standard for the Case Expression (see attached
Word document).   See the attached Word document to view the Derby Community Discussion about
this issue.  See the attached .TXT to view the SYSINFO and to see an example of the steps
to reproduce using IJ.
> Steps to Reproduce:
> ij>values case when 1=2 then 3 else NULL end;
> ERROR 42X89:  Types 'INTEGER' and 'CHAR' are not type compatible.  Neither type is assignable
to the other type.
> Current Workaround:
> ij>values case when 1=2 then 3 else cast(NULL as INT) end;

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