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Posted to dev@phoenix.apache.org by "Swapna Kasula (JIRA)" <ji...@apache.org> on 2016/01/29 20:29:40 UTC

[jira] [Commented] (PHOENIX-2069) Support custom aggregate UDFs

    [ https://issues.apache.org/jira/browse/PHOENIX-2069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15124044#comment-15124044 ] 

Swapna Kasula commented on PHOENIX-2069:
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Does this feature available in latest Phoenix version  - Custom UDF's to support for custom aggregate functions. if not, can you please let know what is the approach to implement custom aggregate functions.

> 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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