db-derby-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Rick Hillegas <Richard.Hille...@Sun.COM>
Subject Re: NPE on an innocent query
Date Thu, 09 Oct 2008 17:57:46 GMT
Hi Stanislav,

I'm also seeing an NPE when I run this script. I have logged 
https://issues.apache.org/jira/browse/DERBY-3904 to track this issue.

Thanks for finding this,
-Rick

Stanislav Bryzgalov wrote:
>
> Hello,
>
> I am getting an NPE when trying to run a pretty innocent query. I 
> suspect this might be because of the platform I am using which is JDK 
> 1.5 "diablo" on FreeBSD. I got it first on 10.3.2.1 <http://10.3.2.1>, 
> then upgraded to 10.4.2.0 <http://10.4.2.0> but the problem did not go 
> away.
>
> After some playing, I narrowed the problem down do a pretty simple 
> example. Can someone run it please and share results.
>
> -- 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;
>
> My derby.log has this:
>
> 2008-10-09 17:11:58.357 GMT Thread[DRDAConnThread_3,5,main] (XID = 
> 7676), (SESSIONID = 0), (DATABASE = coco2), (DRDAID = 
> NF000001.E6C3-4327113593400890529{19}), Failed Statement is: SELECT 
> MAX( T1.D1 ) AS D
>   FROM T1
>   LEFT JOIN T2
>   ON T1.D1 = T2.D2
>   WHERE T2.D2 IS NULL
> java.lang.NullPointerException
>  at 
> org.apache.derby.impl.sql.compile.GroupByNode.considerPostOptimizeOptimizations(Unknown

> Source)
>  at 
> org.apache.derby.impl.sql.compile.SelectNode.genProjectRestrict(Unknown 
> Source)
>  at 
> org.apache.derby.impl.sql.compile.SelectNode.modifyAccessPaths(Unknown 
> Source)
>  at 
> org.apache.derby.impl.sql.compile.DMLStatementNode.optimizeStatement(Unknown 
> Source)
>  at 
> org.apache.derby.impl.sql.compile.CursorNode.optimizeStatement(Unknown 
> Source)
>  at org.apache.derby.impl.sql.GenericStatement.prepMinion(Unknown Source)
>  at org.apache.derby.impl.sql.GenericStatement.prepare(Unknown Source)
>  at 
> org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.prepareInternalStatement(Unknown

> Source)
>  at org.apache.derby.impl.jdbc.EmbedPreparedStatement.<init>(Unknown 
> Source)
>  at org.apache.derby.impl.jdbc.EmbedPreparedStatement20.<init>(Unknown 
> Source)
>  at org.apache.derby.impl.jdbc.EmbedPreparedStatement30.<init>(Unknown 
> Source)
>  at org.apache.derby.jdbc.Driver30.newEmbedPreparedStatement(Unknown 
> Source)
>  at 
> org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown 
> Source)
>  at 
> org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown 
> Source)
>  at org.apache.derby.impl.drda.DRDAStatement.prepare(Unknown Source)
>  at org.apache.derby.impl.drda.DRDAStatement.explicitPrepare(Unknown 
> Source)
>  at org.apache.derby.impl.drda.DRDAConnThread.parsePRPSQLSTT(Unknown 
> Source)
>  at org.apache.derby.impl.drda.DRDAConnThread.processCommands(Unknown 
> Source)
>  at org.apache.derby.impl.drda.DRDAConnThread.run(Unknown Source)
>
> WBR,
>    Stanislav
>


Mime
View raw message