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https://issues.apache.org/jira/browse/DERBY-3002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12753340#action_12753340
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Bryan Pendleton commented on DERBY-3002:
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Given the performance results I noticed in DERBY-4363, I think that the next
step is to prepare
a patch which uses the old-style aggregation-in-the-sort-observer technique for
non-ROLLUP
queries, but which uses the new
sort-it-once-and-aggregate-at-multiple-levels-in-one-pass
technique for ROLLUP queries.
At the same time, I'll also need to resolve the merge conflicts and attend to
the other review comments.
> Add support for GROUP BY ROLLUP
> -------------------------------
>
> Key: DERBY-3002
> URL: https://issues.apache.org/jira/browse/DERBY-3002
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 10.4.1.3
> Reporter: Bryan Pendleton
> Assignee: Bryan Pendleton
> Priority: Minor
> Attachments: fixWhiteSpace.diff, IncludesASimpleTest.diff,
> passesRegressionTests.diff, prototypeChangeNoTests.diff,
> rewriteGroupByRS.diff, rollupNullability.diff, useLookahead.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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