Kenneth Knowles commented on BEAM-3749:

I think this link will clarify: 

The trigger is left alone if you use {{Window.into}} when the SQL sets up the 
window function. It will not set it to the {{DefaultTrigger}}.

> 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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