Jean-Baptiste Onofré created BEAM-638:
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             Summary: 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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