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From "Bryan Pendleton (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-3002) Add support for GROUP BY ROLLUP
Date Sun, 13 Sep 2009 21:42:57 GMT

     [ https://issues.apache.org/jira/browse/DERBY-3002?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Bryan Pendleton updated DERBY-3002:
-----------------------------------

    Attachment: UpdateToTrunkSep2009.diff

Attached 'UpdateToTrunkSep2009.diff' patch does two things:
1) Updates the patch to the current trunk, and resolves some merge conflicts.
2) Restores the use of AggregateSortObserver for the common case of:
    - GROUP BY
    - no ROLLUP
    - input data is NOT already in sorted order
    - no DISTINCT aggregates.

However, I've got some test failures to investigate.

And, I still haven't investigated the review comments from Dag and Knut

And, I haven't yet re-run the performance tests to see if the performance is improved

But here's the patch anyway, for safekeeping and to record where the work is going.


> 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, UpdateToTrunkSep2009.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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