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https://issues.apache.org/jira/browse/DERBY-6565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14087371#comment-14087371
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Knut Anders Hatlen commented on DERBY-6565:
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Thanks for fixing this bug, Dag. You mentioned that we should test the MERGE
statement too. I didn't see a test for that, so I ran one manually. Your patch
indeed fixes the UPDATE clause of the merge statement:
{noformat}
ij> merge into t1 using t2 on (t1.x=t2.x) when matched then update set x =
row_number() over ();
ERROR 42ZC2: Window function is illegal in this context: '<update source>'
clause
{noformat}
However, there seems to be a problem with the INSERT clause of the MERGE
statement. I've filed DERBY-6689. (Ordinary INSERT statements don't seem to
have this problem though.)
> 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
> Assignee: Dag H. Wanvik
> Priority: Minor
> Fix For: 10.11.1.1
>
> Attachments: derby-6565-forbid.diff, derby-6565-forbid.status,
> derby-6565.diff
>
>
> 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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