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Date: Sun, 17 May 2009 12:19:45 -0700 (PDT)
From: "Bryan Pendleton (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Updated: (DERBY-3002) Add support for GROUP BY ROLLUP
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     [ https://issues.apache.org/jira/browse/DERBY-3002?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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

    Attachment: useLookahead.diff

Thanks Knut for the suggestions and encouragement! Attached is
'useLookahead.diff', which:
 - brings the patch up to date with the current trunk
 - adds a new test as Knut suggested to investigate the behavior when trying
   to GROUP BY  a column named ROLLUP
 - adds a LOOKAHEAD instruction to the ROLLUP section of the grammar
   to assist with distinguishing between a ROLLUP grouping and a ROLLUP column.

I think that the next step is to add a number of additional tests, and also some documentation. It would also be nice to investigate the performance impacts
of the feature, as well as the opportunities for further performance improvements.


> Add support for GROUP BY ROLLUP
> -------------------------------
>
>                 Key: DERBY-3002
>                 URL: https://issues.apache.org/jira/browse/DERBY-3002
>             Project: Derby
>          Issue Type: New Feature
>          Components: SQL
>    Affects Versions: 10.4.1.3
>            Reporter: Bryan Pendleton
>            Assignee: Bryan Pendleton
>            Priority: Minor
>         Attachments: IncludesASimpleTest.diff, prototypeChangeNoTests.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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