[jira] Closed: (DERBY-3904) NPE on left join with aggregate

["Rick Hillegas (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DERBY-3904?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rick Hillegas closed DERBY-3904.
--------------------------------


> 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: 10.0.2.0, 10.0.2.1, 10.1.1.0, 10.1.2.1, 10.1.3.1, 10.2.1.6, 10.2.2.0, 10.3.1.4, 10.3.2.1, 10.3.3.0, 10.4.1.3, 10.4.2.0
>            Reporter: Rick Hillegas
>            Assignee: Bryan Pendleton
>             Fix For: 10.4.2.1, 10.5.1.1
>
>         Attachments: derby3904.diff
>
>
> 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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