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https://issues.apache.org/jira/browse/PHOENIX-2069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16289002#comment-16289002
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Sokolov Yura commented on PHOENIX-2069:
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Vote for this feature.
My friend had to patch phoenix in order to add hyper-log-log aggregation. It
was better to make it aggregate udf instead, but there were no possibility.
> Support custom aggregate UDFs
> -----------------------------
>
> Key: PHOENIX-2069
> URL: https://issues.apache.org/jira/browse/PHOENIX-2069
> Project: Phoenix
> Issue Type: Bug
> Reporter: James Taylor
> Assignee: Rajeshbabu Chintaguntla
> Labels: YARN-TLS
>
> We should build on our existing feature of custom UDFs to support custom
> aggregate functions. We could drive the requirements initially from a YARN
> use case to allow them to plugin a custom aggregator that would just be
> passed the Tuple (i.e. List<Cell> for each row scanned) plus a context
> object. The custom code code then do whatever aggregation is required and
> we'd have a hook to serialize back out the per scan aggregation.
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