Robert Metzger created FLINK-4367:
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Summary: Offer separate API for watermark generation and timestamp
extraction
Key: FLINK-4367
URL: https://issues.apache.org/jira/browse/FLINK-4367
Project: Flink
Issue Type: Sub-task
Components: DataStream API
Affects Versions: 1.1.0
Reporter: Robert Metzger
Fix For: 2.0.0
Right now, the {{AssignerWithPunctuatedWatermarks}} and
{{AssignerWithPeriodicWatermarks}} interfaces also require implementing a
{{TimestampAssigner}}.
For cases where the source emits records with timestamps, its not necessary to
extract timestamps again from the records, we just want to generate watermarks.
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