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https://issues.apache.org/jira/browse/BEAM-3749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16390129#comment-16390129
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Kenneth Knowles commented on BEAM-3749:
---------------------------------------

What I mean is that the windowing itself is set up in the SQL via using 
TUMBLE/HOP/SESSION. That is independent of the trigger.

> support customized trigger/accumulationMode in BeamSql
> ------------------------------------------------------
>
>                 Key: BEAM-3749
>                 URL: https://issues.apache.org/jira/browse/BEAM-3749
>             Project: Beam
>          Issue Type: Improvement
>          Components: dsl-sql
>            Reporter: Xu Mingmin
>            Assignee: Xu Mingmin
>            Priority: Major
>             Fix For: 2.5.0
>
>          Time Spent: 2h 10m
>  Remaining Estimate: 0h
>
> Currently BeamSql use {{DefaultTrigger}} for aggregation operations. 
> By adding two options {{withTrigger(Trigger)}} and 
> {{withAccumulationMode(AccumulationMode)}}, developers can specify their own 
> aggregation strategies with BeamSql.
> [~xumingming] [~kedin] [~kenn] for any comments.



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