Eugene Kirpichov commented on BEAM-638:

More discussion currently happening on 

> Add a Window function to create a bounded PCollection from an unbounded one
> ---------------------------------------------------------------------------
>                 Key: BEAM-638
>                 URL: https://issues.apache.org/jira/browse/BEAM-638
>             Project: Beam
>          Issue Type: New Feature
>          Components: sdk-java-core
>            Reporter: Jean-Baptiste Onofré
>            Assignee: Davor Bonaci
> Today, if the pipeline source is unbounded, and the sink expects a bounded 
> collection, there's no way to use a single pipeline. Even a window creates a 
> chunk on the unbounded PCollection, but the "sub" PCollection is still 
> unbounded.
> It would be helpful for users to have a Window function that create a bounded 
> PCollection (on the window) from an unbounded PCollection coming from the 
> source.

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