Allow combiner lifting with AfterProcessingTime trigger in Dataflow Runner
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bug
dataflow
P3
runners
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- Java
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Description
This seems safe with AfterProcessingTime since otherwise assigning to panes is based upon system timing. A valid output without combiner lifting would be for all the elements to arrive in a single batch with the same timestamp so allowing combiner lifting seems equivalent and more efficient.
Imported from Jira [BEAM-4525](https://issues.apache.org/jira/browse/BEAM-4525). Original Jira may contain additional context.
Reported by: scwhittle.
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