[
https://issues.apache.org/jira/browse/DERBY-2998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12574962#action_12574962
]
Thomas Nielsen commented on DERBY-2998:
---------------------------------------
Wrt allowing order by in a subquery select:
I did the limited changes needed to allow order by in a subquery select, and
have a working proto in my sandbox. Enables ordering and restriction on the
window function column like we would like.
ij> select * from (select row_number() over () as r, t.* from t order by b
desc) tr where r<3;
R |A |B
--------------------------------------------
1 |50 |500
2 |40 |400
Is this something we would like to support?
Do you think it's worth making a new jira for this?
The closest I could find was DERBY-4, but it's not identical as it centers
around a INSERT INTO ... SELECT FROM ... query. And it is currently veto'ed.
Looking at the patch for DERBY-4 now, I see it does more or less the same thing
as my changes, only for insert statements.
> 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, d2998-19.diff,
> d2998-19.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-doc-2.diff, d2998-doc-2.stat,
> d2998-followup-2.diff, d2998-followup-2.stat, d2998-followup-distinct.diff,
> d2998-followup-distinct.stat, d2998-followup-doc3.diff,
> d2998-followup-doc3.stat, d2998-followup-issue1.diff,
> d2998-followup-issue1.stat, d2998-followup-issue4.diff,
> d2998-followup-issue4.stat, d2998-followup-testsuite.diff,
> d2998-followup-testsuite.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, d2998-test9.diff, rreffuncrownumber.html
>
>
> 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
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
