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From "Bryan Pendleton (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1763) Using RTRIM(LTRIM(col)) and group by col gives NPE
Date Fri, 25 Aug 2006 14:11:22 GMT
    [ 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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