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Posted to derby-dev@db.apache.org by "Bryan Pendleton (JIRA)" <de...@db.apache.org> on 2006/08/25 16:11:22 UTC
[jira] Commented: (DERBY-1763) Using RTRIM(LTRIM(col)) and group by
col gives NPE
[ http://issues.apache.org/jira/browse/DERBY-1763?page=comments#action_12430514 ]
Bryan Pendleton commented on DERBY-1763:
----------------------------------------
I think the bug also involves the "count(*)"; if you remove that from the select
statement (SELECT RTRIM(LTRIM(c1)) FROM t1 GROUP BY c1), the
null pointer exception does not occur.
Also, when you run with a sane=true build, the message is slightly different
and also points more directly at the count(*) part of the query. The message
in a sane=true build is:
ij> select rtrim(ltrim(c1)), count(*), c1 from t1 group by c1;
ERROR XJ001: Java exception: 'ASSERT FAILED col[2] is null: org.apache.derby.shared.common.sanity.AssertFailure'.
> 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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