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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-6091) Implement and turn on the retraction for aggregates
Date Wed, 26 Apr 2017 07:33:04 GMT

    [ https://issues.apache.org/jira/browse/FLINK-6091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15984308#comment-15984308
] 

ASF GitHub Bot commented on FLINK-6091:
---------------------------------------

Github user hequn8128 commented on the issue:

    https://github.com/apache/flink/pull/3733
  
    hi @fhueske , thanks a lot for your review and help. I have addressed all your comments
and updated the PR. All changes have been checked before my latest update. 
    Thanks,  Hequn


> Implement and turn on the retraction for aggregates
> ---------------------------------------------------
>
>                 Key: FLINK-6091
>                 URL: https://issues.apache.org/jira/browse/FLINK-6091
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table API & SQL
>            Reporter: Shaoxuan Wang
>            Assignee: Hequn Cheng
>
> Implement functions for generating and consuming retract messages for different aggregates.

> 1. add delete/add property to Row
> 2. implement functions for generating retract messages for unbounded groupBy
> 3. implement functions for handling retract messages for different aggregates.
> 4. handle retraction messages in CommonCorrelate and CommonCalc (retain Delete property).
> Note: Currently, only unbounded groupby generates retraction and it is working under
unbounded and processing time mode. Hence, retraction is only supported for unbounded and
processing time aggregations so far. We can add more retraction support later.
> supported now: unbounded groupby, unbounded and processing time over window
> unsupported now: group window, event time or bounded over window.



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