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https://issues.apache.org/jira/browse/DERBY-2998?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Nielsen updated DERBY-2998:
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Attachment: d2998-4.stat
d2998-4.diff
Attaching 'd2998-4.diff' and 'd2998-4.stat' which includes optimization as
well. It's still a little rough around the edges, but seems to work for this
query:
select * from (select row_number() as r, t.* from t) as tr where r <= 2;
Comments are very welcome.
Tip: Uncomment the (crude) System.out.println() in BaseActivation see the
computation.
> 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: d2998-3.diff, d2998-3.stat, d2998-4.diff, d2998-4.stat,
> row_number_prototype-2c.diff, row_number_prototype-2c.stat
>
>
> 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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