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Therefore, we propose to support only full window processing on DataStream. This feature is designed to work only when RuntimeExecutionMode=BATCH and does not support checkpointingcheckpoint. If user specifies RuntimeExecutionMode=STREAMING, the job will be failed to submit. Given this premiseWithout the requirement for checkpoint, the underlying implementation can no longer rely on keyed state and avoid the aforementioned conflict issues by not relying on keyed state for window processing.

The definition of PartitionWindowedStream

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