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https://issues.apache.org/jira/browse/BEAM-28?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16795622#comment-16795622
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Kenneth Knowles commented on BEAM-28:
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[~lcwik] [~CraigChambersG] another issue for the portable model to consider.
Since this ticket was filed, the responsibility has landed on WindowMappingFn.
It may be that Sessions is simply something that requires the user to provide a
WindowMappingFn.
> Support side inputs for Sessions
> --------------------------------
>
> Key: BEAM-28
> URL: https://issues.apache.org/jira/browse/BEAM-28
> Project: Beam
> Issue Type: New Feature
> Components: beam-model
> Reporter: Kenneth Knowles
> Priority: Major
> Labels: Windowing, triaged
>
> Today, the side input window Sessions is undefined in the model (thus the
> Java implementation of #getSideInputWindow throws
> UnsupportedOperationException).
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