Whether to handle removed partitions in KafkaSourceEnumerator ?

[Hongshun Wang]

Hi Devs,

There are some to-do comments and variables related to the removed
partitions handle (such as PartitionSplitChange#removedPartitions) in
KafkaSourceEnumerator that have been around for years. I am wondering
whether  we still need to implement it or  no longer necessary to handle
the removed partitions? If no longer necessary, why not remove it?

Best,

Hongshun