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NOTE: some features originally included in this FLIP have been moved for to FLIP-331.

NOTE: this FLIP depends on the APIs (e.g. RecordAttributes with isBacklog information) proposed in FLIP-325. While FLIP-325 allows an operator to buffer records for arbitrary long while its input records have isBacklog=true, this FLIP additionally allows an operator to use optimizations that is currently only applicable in the batch execution mode (e.g. using ExternalSorter which does not support checkpoint).

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