Support custom merging window fns for portable flink runner.
Open
bug
flink
P3
runners
- Dominant language
- Java
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Description
Imported from Jira [BEAM-11004](https://issues.apache.org/jira/browse/BEAM-11004). Original Jira may contain additional context.
Reported by: robertwb.
This issue has child subcomponents which were not migrated over. See the original Jira for more information.
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