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https://issues.apache.org/jira/browse/FLINK-6544?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kaibo Zhou updated FLINK-6544:
------------------------------
    Description: 
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.





  was:
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#


> 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
>
> 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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