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https://issues.apache.org/jira/browse/DERBY-3002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12519689
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Bryan Pendleton commented on DERBY-3002:
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My first idea is to try placing the logic for this feature inside
GroupedAggregateResultSet. It seems like it should be fairly straightforward
(famous last words!) to compute the aggregates for multiple grouping sets in a
single pass through the source records.
> 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
>
> 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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