NPE on left join with aggregate
-------------------------------
Key: DERBY-3904
URL: https://issues.apache.org/jira/browse/DERBY-3904
Project: Derby
Issue Type: Bug
Components: SQL
Affects Versions: 10.4.2.0
Reporter: Rick Hillegas
Stanislav Bryzgalov reported that the following script raises an NPE on the
last query (a left join involving an aggregate). I have verified this in my
environment:
drop table t1;
drop table t2;
-- create two simple tables
CREATE TABLE T1( D1 DATE NOT NULL PRIMARY KEY, N1 VARCHAR( 10 ) );
CREATE TABLE T2( D2 DATE NOT NULL PRIMARY KEY, N2 VARCHAR( 10 ) );
-- insert some data, two recs in T1 and one in T2
INSERT INTO T1 VALUES( DATE( '2008-10-01' ), 'something' ), ( DATE(
'2008-10-02' ), 'something' );
INSERT INTO T2 VALUES( DATE( '2008-10-01' ), 'something' );
-- this runs fine, gives one record '2008-10-02'
SELECT T1.D1
FROM T1
LEFT JOIN T2
ON T1.D1 = T2.D2
WHERE T2.D2 IS NULL;
-- this runs fine too, gives one record '2008-10-02'
SELECT MAX( T1.D1 ) as D
FROM T1
WHERE T1.D1 NOT IN ( SELECT T2.D2 FROM T2 );
-- this one breaks!!!
-- SQL State = XJ001 SQL Code = -1 SQL Message = DERBY SQL error: SQLCODE: -1,
SQLSTATE: XJ001, SQLERRMC: java.lang.NullPointerException
SELECT MAX( T1.D1 ) AS D
FROM T1
LEFT JOIN T2
ON T1.D1 = T2.D2
WHERE T2.D2 IS NULL;
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