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Posted to derby-dev@db.apache.org by "Kathey Marsden (JIRA)" <de...@db.apache.org> on 2006/09/06 05:13:25 UTC
[jira] Updated: (DERBY-1763) Using RTRIM(LTRIM(col)) and group by
col gives NPE
[ http://issues.apache.org/jira/browse/DERBY-1763?page=all ]
Kathey Marsden updated DERBY-1763:
----------------------------------
Derby Info: (was: [Existing Application Impact])
Unchecking "Existing Application Impact" as it is an indicator that it is used for behavior changes which may newly affect applications that are already running successfully on Derby . From what I understand of this issue it is not a change in behavior or regression from a previous Derby release which might affect an Existing Derby Application on upgrade.
Chris, I hope you will get involved and take a shot at fixing this bug. There are lots of SQL experts on the list who I am sure would be happy to help. See: http://wiki.apache.org/db-derby/FrontPage#head-586d3e6d6e98537c1aff50dc1aec0d62412cb526
for information on getting started.
> Using RTRIM(LTRIM(col)) and group by col gives NPE
> --------------------------------------------------
>
> Key: DERBY-1763
> URL: http://issues.apache.org/jira/browse/DERBY-1763
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.1.3.1
> Environment: Windows 2000, Sun JDK 1.4.2_10
> Reporter: Christopher Schick
>
> When trying to execute a simple SQL Statement that includes both the RTRIM() and LTRIM() functions on a column in the SELECT clause and contains a GROUP BY clause on that column, the following Nullpointer Exception is thrown:
> ERROR XJ001: Java exception: ': java.lang.NullPointerException'.
> This does NOT happen, if only RTRIM() OR LTRIM() is used, or if no GROUP BY clause is specified.
> This issue is quite urgent for us, as we don't see a workaround to achieve the desired results.
> Attached an example table schema and the affected SELECT Statement.
> --------------------------------------------
> CREATE TABLE t1 (
> c1 VARCHAR(10),
> c2 VARCHAR(10)
> );
> INSERT INTO t1 VALUES('a', 'b');
> INSERT INTO t1 VALUES('c', 'd');
> SELECT RTRIM(LTRIM(c1)),
> COUNT(*)
> FROM t1
> GROUP BY c1;
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