GroupIntoBatches does not properly maintain watermarks
Open
core
improvement
java
P3
- Dominant language
- Java
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Description
Since GIB buffers elements, the watermark should be held up to the minimum event-time buffered. Timer.withOutputTimestamp is the correct way to do this in Beam.
Imported from Jira [BEAM-12690](https://issues.apache.org/jira/browse/BEAM-12690). Original Jira may contain additional context.
Reported by: reuvenlax.
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