[jira] [Created] (FLINK-12794) Support ACC mode for non-window streaming FlatAggregate on Table API

[Shang Yuanchun (Jira)]

sunjincheng created FLINK-12794:
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             Summary: Support ACC mode for non-window streaming FlatAggregate on Table API
                 Key: FLINK-12794
                 URL: https://issues.apache.org/jira/browse/FLINK-12794
             Project: Flink
          Issue Type: Sub-task
          Components: Table SQL / API
    Affects Versions: 1.9.0
            Reporter: sunjincheng


Since the execution of the Stream operator has two modes, `ACC` and `ACCRetract`, users can achieve better performance by implementing special interfaces for streaming. The table below is a quick summary.
| |emitValue|emitUpdateWithRetract|emitUpdateWithoutRetract|
|ACC|Y|N|Y|
|ACCRetract|Y|Y|N|
 * emitValue - for batch and streaming.
 * eimitUpdateWithRetract - only for streaming in ACC mode(need key definition on TableAggregateFunction, [under discussion|https://docs.google.com/document/d/183qHo8PDG-xserDi_AbGP6YX9aPY0rVr80p3O3Gyz6U/edit?usp=sharing]).
 * emitUpdateWithoutRetract - only for streaming in ACCRetract mode.

 In this Jira we will add the ACC mode support for non-window streaming FlatAggregate. the detail can be found in [Flip-29|https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=97552739]



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