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https://issues.apache.org/jira/browse/DERBY-5954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13477957#comment-13477957
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Rick Hillegas commented on DERBY-5954:
--------------------------------------
The user reports:
"NOTE:
I have tested this with Derby 10.5, 10.8 and 10.9
The queries *work with Derby 10.5* ; but fail with 10.8 and 10.9"
> 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: 10.10.0.0
> Reporter: Rick Hillegas
>
> 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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