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Date: Fri, 25 Aug 2006 02:33:22 -0700 (PDT)
From: "Christopher Schick (JIRA)" <derby-dev@db.apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Created: (DERBY-1763) Using RTRIM(LTRIM(col)) and group by
 col gives NPE
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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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