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Posted to derby-dev@db.apache.org by "Rick Hillegas (JIRA)" <ji...@apache.org> on 2011/04/29 14:58:03 UTC

[jira] [Commented] (DERBY-672) Re-enable user defined aggregates

    [ https://issues.apache.org/jira/browse/DERBY-672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13026961#comment-13026961 ] 

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

Another use-case for this feature came up on the Derby user list: implementing a MySQL-style GROUP_CONCAT function. See http://old.nabble.com/help-with-sql-query-for-Derby-to31503029.html#a31503029

> 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
>
> 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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