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https://issues.apache.org/jira/browse/DERBY-672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13031316#comment-13031316
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Rick Hillegas commented on DERBY-672:
-------------------------------------
The IBM Informix syntax for declaring a user-defined aggregate can be found
here: www.informixoncampus.org/IDS_DOC/SQLSyntax1150.pdf
CREATE AGGREGATE [<schemaName>.]<aggregateName>
WITH
(
[ INIT = <initFunctionName> ]
ITER = <accumulatorFunctionName>
COMBINE = <mergeFunctionName>
[ FINAL = <resultsFunctionName> ]
[ HANDLESNULLS ]
)
> 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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