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From "Bryan Pendleton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5954) NPE in SELECT involving subselects and windows functions
Date Thu, 08 Nov 2012 02:36:12 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13492904#comment-13492904
] 

Bryan Pendleton commented on DERBY-5954:
----------------------------------------

Dag, thanks for working through the reasoning with us. It helps me to understand your
thinking, and describing it as you did will also help future students of the code who
are trying to understand its behavior. It is much appreciated!

                
> NPE in SELECT involving subselects and windows functions
> --------------------------------------------------------
>
>                 Key: DERBY-5954
>                 URL: https://issues.apache.org/jira/browse/DERBY-5954
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.6.1.0, 10.6.2.1, 10.7.1.1, 10.8.1.2, 10.8.2.2, 10.9.1.0
>            Reporter: Rick Hillegas
>            Assignee: Dag H. Wanvik
>             Fix For: 10.9.1.1, 10.10.0.0, 10.8.3.1
>
>         Attachments: derby-5954.diff, derby-5954-with-test-2.diff, derby-5954-with-test-2.stat,
derby-5954-with-test.diff, derby-5954-with-test.stat
>
>
> A user reports and I have verified an NPE on the following SELECT:
> connect 'jdbc:derby:memory:db;create=true';
> create table blah ( a int );
> insert into blah values (1), (2), (3), (4), (5), (6), (7);
> SELECT rn, (SELECT rn FROM (SELECT row_number() over() rn FROM blah ) as T2
> where T2.rn = T1.rn+1) rn2
> FROM (SELECT row_number() over() rn from blah) as T1;

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