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From "John Peterson (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-1620) SQL CASE statement returns ERROR 42X89 when including NULL as a return value
Date Fri, 01 Jun 2007 21:15:15 GMT

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

John Peterson updated DERBY-1620:

    Attachment: ConditionalNode.diff

Per previous comments, I've added javadoc information to the private methods isCastNode()
and isCastToChar(), removed the unused shouldCast() methods, updated the recastNullNodes to
use the remaining shouldCast() method, and tried to improve the comments on the if-then-else
blocks determining recursive calls.  I've also created a new class org.apache.derbyTesting.functionTests.tests.lang.CaseExpressionTest.java
which converts my additions to the org.apache.derbyTesting.functionTests.tests.jdbcapi.resultset.java
class over to the new junit testing suite.  If these last few small changes are acceptable,
then I will close out this bug.

> 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:
>         Environment: Windows XP
>            Reporter: John Peterson
>            Assignee: John Peterson
>            Priority: Minor
>             Fix For:
>         Attachments: ConditionalNode.diff, 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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