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From "Thomas Nielsen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2998) Add support for ROW_NUMBER() window function
Date Tue, 04 Mar 2008 18:33:41 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12575092#action_12575092
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Thomas Nielsen commented on DERBY-2998:
---------------------------------------

>> I considered your proposed change, but turned it down as I thought it too general.
> Okay, good to know the idea was at least considered :) 

It seems using containsWindowFunctionResultColumn() is safe after all. I'll upload a new patch
tomorrow morning, along with the removal of ColumnReference.pointsToWindowFunction().

Army> I think the first question is whether or not that is supported by the standard. 

Actually it doesn't seem to be - and that's most likely the reason why it's not in there already
:)  The <order by clause> is part of <declare cursor>. <subquery> only includes
<query expression>, which again includes <query specification>, which again does
*not* include <declare cursor>.

The specific problem we want to solve will be fixed when window ordering is included, so I
won't pursue this now.

> 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

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