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https://issues.apache.org/jira/browse/DERBY-3002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12521273
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Manish Khettry commented on DERBY-3002:
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If I read the diff correctly, you're sorting the same data multiple times? Is
it not possible to compute the rollups with a single sort? The wiki page also
suggests that this is possible.
> Add support for GROUP BY ROLLUP
> -------------------------------
>
> Key: DERBY-3002
> URL: https://issues.apache.org/jira/browse/DERBY-3002
> Project: Derby
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 10.4.0.0
> Reporter: Bryan Pendleton
> Assignee: Bryan Pendleton
> Priority: Minor
> Attachments: prototypeChangeNoTests.diff
>
>
> Provide an implementation of the ROLLUP form of multi-dimensional grouping
> according to the SQL standard.
> See http://wiki.apache.org/db-derby/OLAPRollupLists for some more detailed
> information about this aspect of the SQL standard.
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