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https://issues.apache.org/jira/browse/DERBY-6565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14085574#comment-14085574
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Dag H. Wanvik commented on DERBY-6565:
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I have looked at this issue, and it seems that the problem is that the rewrite
of the ROW_LOCATION function in the query optimization phase of the SELECT node
into a ProjectRestrictNode just isn't prepared for being part of an UPDATE
statement. So, it is a mini-project to implement ROW_LOCATION for UPDATE: a)
Modify the query tree re-write in the optimization phase to handle the
simultaneous presence of UPDATE and ROW LOCATION, b) modify the code
generation, and c) possibly some changes to the run-time result sets to
accommodate that an update result set may also contain a WindowResultSet.
> ROW_NUMBER function throws NullPointerException in UPDATE statement
> -------------------------------------------------------------------
>
> Key: DERBY-6565
> URL: https://issues.apache.org/jira/browse/DERBY-6565
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.10.2.0
> Reporter: Knut Anders Hatlen
> Priority: Minor
>
> A NullPointerException is raised with this (possibly illegal?) UPDATE
> statement:
> {noformat}
> ij version 10.10
> ij> connect 'jdbc:derby:memory:db;create=true';
> ij> create table t(x int);
> 0 rows inserted/updated/deleted
> ij> insert into t values 1;
> 1 row inserted/updated/deleted
> ij> update t set x = row_number() over ();
> ERROR XJ001: Java exception: ': java.lang.NullPointerException'.
> {noformat}
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