GitHub user sunjincheng121 opened a pull request:

    https://github.com/apache/flink/pull/4157

    [Flink 6649][table]Improve Non-window group aggregate with update int…

    In this PR. I have add supports updating the calculated data according to 
the specified time interval on non-window group AGG. If we config the time 
interval is N seconds, then the next update time relative to the latest update 
time T, is T+N seconds. For example, the time interval is 2 seconds, the 
previous update time is T seconds, and the next update time T1> = T + 2 
seconds. If no data arrives during T to T + 2, no updates are made.
    
    Thanks for contributing to Apache Flink. Before you open your pull request, 
please take the following check list into consideration.
    If your changes take all of the items into account, feel free to open your 
pull request. For more information and/or questions please refer to the [How To 
Contribute guide](http://flink.apache.org/how-to-contribute.html).
    In addition to going through the list, please provide a meaningful 
description of your changes.
    
    - [x] General
      - The pull request references the related JIRA issue ("[Flink 
6649][table]Improve Non-window group aggregate with update interval.")
      - The pull request addresses only one issue
      - Each commit in the PR has a meaningful commit message (including the 
JIRA id)
    
    - [ ] Documentation
      - Documentation has been added for new functionality
      - Old documentation affected by the pull request has been updated
      - JavaDoc for public methods has been added
    
    - [x] Tests & Build
      - Functionality added by the pull request is covered by tests
      - `mvn clean verify` has been executed successfully locally or a Travis 
build has passed


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/sunjincheng121/flink FLINK-6649

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/4157.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #4157
    
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commit 68ecd416bbdf70ed01d195c805c92d03f5ae6004
Author: sunjincheng121 <sunjincheng...@gmail.com>
Date:   2017-06-14T01:36:48Z

    [Flink 6649][table]Improve Non-window group aggregate with update interval.

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