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From "Bryan Pendleton (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3880) NPE on a query with having clause involving a join
Date Wed, 12 Nov 2008 05:23:44 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12646804#action_12646804
] 

Bryan Pendleton commented on DERBY-3880:
----------------------------------------

Thanks Army!

I had overlooked your explanation about the construction of the JoinNode RCL; thanks
for the clarification. I worked through JoinNode.buildRCL and I see exactly what you mean:

                /* Now we append the propagated RCL from the right to the one from
                 * the left and call it our own.
                 */
                resultColumns.nondestructiveAppend(tmpRCL);

It seems like it would be worth following up some more on the other topics; I'll see about
filing them as separate JIRA issues so we can pursue them down the line.

Thanks again not only for the fix, but even better for helping me understand how it works.


> NPE on a query with having clause involving a join
> --------------------------------------------------
>
>                 Key: DERBY-3880
>                 URL: https://issues.apache.org/jira/browse/DERBY-3880
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.4.2.0
>         Environment: Windows 2003 Server 
>            Reporter: Venkateswaran Iyer
>            Assignee: A B
>            Priority: Minor
>             Fix For: 10.3.3.1, 10.4.2.1, 10.5.0.0
>
>         Attachments: AggregateExpressionResultColumn.txt, querytree_fail.txt, querytree_works.txt
>
>
> A simple query involving a join and having clause causes a NPE. Any subsequent executions
cause severe errors. It almost looks like the underlying connection was closed out.
> ====
> C:\apps\derby\db-derby-10.4.2.0-bin\db-derby-10.4.2.0-bin\bin>ij
> ij version 10.4
> ij> connect 'jdbc:derby://speed:1527/ClassicModels;user=sa;password=sa
> ';
> ij> create table t1(i int, c varchar(20));
> 0 rows inserted/updated/deleted
> ij> create table t2(i int, c2 varchar(20), i2 int);
> 0 rows inserted/updated/deleted
> ij> insert into t1 values(1, 'abc');
> 1 row inserted/updated/deleted
> ij> insert into t1 values(2, 'abc');
> 1 row inserted/updated/deleted
> ij> insert into t2 values(1, 'xyz', 10);
> 1 row inserted/updated/deleted
> ij> insert into t2 values(1, 'aaa', 20);
> 1 row inserted/updated/deleted
> ij> insert into t2 values(2, 'xxx', 30);
> 1 row inserted/updated/deleted
> ij> select t1.i, avg(t2.i2) from t1 inner join t2 on (t1.i = t2.i) group by t1.i
>  having avg(t2.i2) > 0;
> ERROR XJ001: DERBY SQL error: SQLCODE: -1, SQLSTATE: XJ001, SQLERRMC: java.lang.
> NullPointerException¶¶XJ001.U

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