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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:
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>> 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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