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https://issues.apache.org/jira/browse/FLINK-6544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16756175#comment-16756175
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Kurt Young commented on FLINK-6544:
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I'm closing this issue since it will be addressed after blink gets merged.
> 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 & 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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