Implement AssignWindows for known WindowFns in the ReferenceRunner
Open
direct
new feature
P3
runners
- Dominant language
- Java
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Description
This decodes known `WindowFns` from the portable representation if there is no associated environment, and runs those `WindowFns` on the input stream. As none of those known fns interact with the element directly, this is safe to do outside of an SDK harness.
Imported from Jira [BEAM-4241](https://issues.apache.org/jira/browse/BEAM-4241). Original Jira may contain additional context.
Reported by: tgroh.
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