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https://issues.apache.org/jira/browse/DERBY-672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13610310#comment-13610310
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Rick Hillegas commented on DERBY-672:
-------------------------------------
Ported 1459784 to 10.10 branch at subversion revision 1459787.
> 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: d672-no-exceptions.diff, 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, derby-672-08-aa-fixJSR169yetAgain.diff,
> derby-672-09-ab-udtAggregates.diff, derby-672-10-af-typeBounds.diff,
> derby-672-11-aa-tests.diff, derby-672-11-ab-tests.diff,
> derby-672-12-aa-implicitCasts.diff, derby-672-13-aa-differentReturnType.diff,
> derby-672-14-aa-collations.diff, derby-672-15-aa-setCollation.diff,
> derby-672-16-aa-forbidInGroupBy.diff, derby-672-17-aa-moreTests.diff,
> derby-672-18-aa-udaInJar.diff, derby-672-19-aa-precisionChecks.diff,
> derby-672-20-aa-exactBounds.diff, derby-672-21-aa-typeDependencies.diff,
> derby-672-22-aa-makeModeAggregateStateSerializable.diff,
> UserDefinedAggregates.html, UserDefinedAggregates.html,
> 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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