[jira] [Commented] (GEARPUMP-316) Don't enforce groupBy after window

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/GEARPUMP-316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16039095#comment-16039095 ] 

ASF GitHub Bot commented on GEARPUMP-316:
-----------------------------------------

GitHub user manuzhang opened a pull request:

    https://github.com/apache/incubator-gearpump/pull/186

    [GEARPUMP-316] Decouple groupBy from window

    Be sure to do all of the following to help us incorporate your contribution
    quickly and easily:
    
     - [ ] Make sure the commit message is formatted like:
       `[GEARPUMP-<Jira issue #>] Meaningful description of pull request` 
     - [ ] Make sure tests pass via `sbt clean test`.
     - [ ] Make sure old documentation affected by the pull request has been updated and new documentation added for new functionality. 
    


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

    $ git pull https://github.com/manuzhang/incubator-gearpump window

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

    https://github.com/apache/incubator-gearpump/pull/186.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 #186
    
----
commit 950f765c3488790afac04159b093de398a87fdfd
Author: manuzhang <ow...@gmail.com>
Date:   2017-06-05T04:54:12Z

    [GEARPUMP-316] Decouple groupBy from window

----


> Don't enforce groupBy after window
> ----------------------------------
>
>                 Key: GEARPUMP-316
>                 URL: https://issues.apache.org/jira/browse/GEARPUMP-316
>             Project: Apache Gearpump
>          Issue Type: Sub-task
>          Components: streaming
>            Reporter: Manu Zhang
>            Assignee: Manu Zhang
>
> Return a normal Stream instead of WindowStream on window function. Window function defines a boundary (window) for elements and the following operations should fall in corresponding boundaries. The boundary should not change until a new window function is defined. The default boundary is the {{GlobalWindows}} if not defined.
> This means there will be a window context for each underlying task. Elements are emitted in terms of the trigger semantics. 



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