Support non-default window mapping function in Flink portable streaming
Open
flink
improvement
P3
portability
runners
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- Java
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Description
Currently the default window mapping function is used for checking side input readiness:
[https://lists.apache.org/thread.html/0712ed94680327694d8309c22e2d5601ee78ed59148f6edd0e4959f6@%3Cdev.beam.apache.org%3E](https://lists.apache.org/thread.html/0712ed94680327694d8309c22e2d5601ee78ed59148f6edd0e4959f6@%3Cdev.beam.apache.org%3E)
Imported from Jira [BEAM-5217](https://issues.apache.org/jira/browse/BEAM-5217). Original Jira may contain additional context.
Reported by: thw.
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