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Date: Wed, 5 Sep 2012 03:14:08 +1100 (NCT)
From: "Rick Hillegas (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Message-ID: <269272192.33187.1346775248909.JavaMail.jiratomcat@arcas>
Subject: [jira] [Commented] (DERBY-672) Re-enable user defined aggregates
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    [ https://issues.apache.org/jira/browse/DERBY-672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13447782#comment-13447782 ] 

Rick Hillegas commented on DERBY-672:
-------------------------------------

Hi Mamta,

Thanks for thinking about this issue. Right, I have put in logic to prevent user-defined aggregate names from colliding with the names of functions, both builtin functions and user-defined functions. Thinking about this collision is what caused me to stumble across the existing problem with user-defined functions and to log DERBY-5901. Technically, all that has to be prevented is the collision of user-defined aggregate names with the names of 1-arg functions. If someone complains about the over-broad limitation, we can dial it back later on. Thanks.
                
> Re-enable user defined aggregates
> ---------------------------------
>
>                 Key: DERBY-672
>                 URL: https://issues.apache.org/jira/browse/DERBY-672
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Rick Hillegas
>            Assignee: Rick Hillegas
>         Attachments: derby-672-01-aa-ddl.diff, derby-672-02-ac-nonDistinct.diff, derby-672-03-aa-distinct.diff, derby-672-03-ab-distinct.diff, derby-672-04-aa-fixJSR169test.diff, derby-672-05-aa-java7testOrderProblem.diff, derby-672-06-aa-grantRevoke.diff, derby-672-07-aa-fixJSR169again.diff, UserDefinedAggregates.html, UserDefinedAggregates.html
>
>
> Nicolas Dufour in an email thread titled "functions and list" started on November 2, 2005 requests the ability to create user defined aggregates.
> This functionality used to be in Cloudscape. It was disabled presumably because it was considered non-standard. However, most of the machinery needed for this feature is still in the code. We should re-enable user defined aggregates after we agree on acceptable syntax.

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