Github user pnowojski commented on the issue:
https://github.com/apache/flink/pull/4321
Dropping this field would make it more error prone in the future if anyone
would call `reassingPartitions()` from somewhere else. For me
`hasAssignedPartitions` is tightly related to the state of the `consumer` field
(in perfect world it should be exposed via `consumer`'s API...), thus also
should be maintained as the class state.
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