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https://issues.apache.org/jira/browse/DERBY-2998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12573083#action_12573083
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Thomas Nielsen commented on DERBY-2998:
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I've started looking at why the last two queries fail, and they both run down a
code path I haven't been down before - involving a couple of JoinNodes and some
"trickery" with the RCL. The predicate t1.a is pulled into the RCL, like we do
for PRNs under certain conditions with a where predicate, and this somehow
cause problems during code generation. I'll investigate more tomorrow, but as
of now it doesn't look like its yet another RCL->WindowFunction assumption gone
bad. It's probably related though - if I exchange the WindowFunction for a
constant it works fine.
> Add support for ROW_NUMBER() window function
> --------------------------------------------
>
> Key: DERBY-2998
> URL: https://issues.apache.org/jira/browse/DERBY-2998
> Project: Derby
> Issue Type: Sub-task
> Components: SQL
> Reporter: Thomas Nielsen
> Assignee: Thomas Nielsen
> Priority: Minor
> Attachments: d2998-10.diff, d2998-10.stat, d2998-11.diff,
> d2998-12.diff, d2998-12.stat, d2998-13.diff, d2998-13.stat, d2998-14.diff,
> d2998-14.stat, d2998-15.diff, d2998-15.stat, d2998-16.diff, d2998-16.stat,
> d2998-17.diff, d2998-17.stat, d2998-18.diff, d2998-18.stat, d2998-4.diff,
> d2998-4.stat, d2998-5.diff, d2998-5.stat, d2998-6.diff, d2998-6.stat,
> d2998-7.diff, d2998-7.stat, d2998-8.diff, d2998-8.stat, d2998-9-derby.log,
> d2998-9.diff, d2998-9.stat, d2998-doc-1.diff, d2998-doc-1.stat,
> d2998-test.diff, d2998-test.stat, d2998-test2.diff, d2998-test2.stat,
> d2998-test3.diff, d2998-test3.stat, d2998-test4.diff, d2998-test4.stat,
> d2998-test6.diff, d2998-test7.diff, d2998-test8.diff
>
>
> As part of implementing the overall OLAP Operations features of SQL
> (DERBY-581), implement the ROW_NUMBER() window function.
> More information about this feature is available at
> http://wiki.apache.org/db-derby/OLAPRowNumber
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