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Posted to issues@flink.apache.org by "Kurt Young (JIRA)" <ji...@apache.org> on 2019/01/30 10:29:00 UTC

[jira] [Closed] (FLINK-6544) Expose State Backend Interface for UDAGG

     [ https://issues.apache.org/jira/browse/FLINK-6544?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kurt Young closed FLINK-6544.
-----------------------------
    Resolution: Unresolved

> Expose State Backend Interface for UDAGG
> ----------------------------------------
>
>                 Key: FLINK-6544
>                 URL: https://issues.apache.org/jira/browse/FLINK-6544
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API &amp; SQL
>            Reporter: kaibo.zhou
>            Assignee: kaibo.zhou
>            Priority: Major
>
> Currently UDAGG users can not access state, it's necessary to provide users with a convenient and efficient way to access the state within the UDAGG.
> This is the design doc: https://docs.google.com/document/d/1g-wHOuFj5pMaYMJg90kVIO2IHbiQiO26nWscLIOn50c/edit#
> Proposed Changes:
> 1. Implementation of DataView to support state access for UDAGG
> 2. Support getAccumulatorType when use DataView
> 3. Refactor build-in agg(MaxWithRetractAccumulator and MinWithRetractAccumulator) using the DataView
> 4. Support DataView in Java and Scala Tuples and Case classes or as the accumulator of AggregateFunction itself.



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