[jira] [Commented] (FLINK-3174) Add merging WindowAssigner

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

    [ https://issues.apache.org/jira/browse/FLINK-3174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15224109#comment-15224109 ] 

ASF GitHub Bot commented on FLINK-3174:
---------------------------------------

Github user StephanEwen commented on the pull request:

    https://github.com/apache/flink/pull/1802#issuecomment-205294872
  
    Very nice work. 
    
    After an offline chat with @aljoscha , we concluded to slightly adjust the `Trigger` interface to make it simpler for people to develop triggers.
    
    Other than that, this is good to merge...


> Add merging WindowAssigner
> --------------------------
>
>                 Key: FLINK-3174
>                 URL: https://issues.apache.org/jira/browse/FLINK-3174
>             Project: Flink
>          Issue Type: Improvement
>          Components: Streaming
>            Reporter: Aljoscha Krettek
>            Assignee: Aljoscha Krettek
>             Fix For: 1.0.0
>
>
> We should add the possibility for WindowAssigners to merge windows. This will enable Session windowing support, similar to how Google Cloud Dataflow supports.
> For session windows, each element would initially be assigned to its own window. When triggering we check the windows and see if any can be merged. This way, elements with overlapping session windows merge into one session.



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