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1. ResultSubPartition is kept when the consumer exits (task fails), the consumer only releases the view.
2. ResultSubPartition is released through ResultPartitionManager on
   1. consumption finished; 
   2. producer failure/cancellation; 
   3. Job exits
3. Multiple views can be created on the same subpartition, but only one view exists at a time (No two views exist at the same time).

The proposed changes are either:

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We plan to introduce a new `ResultPartitionType.PIPELINED_APPROXIMATE` and its corresponding ResultSubPartition to minimize the impact on existing system behavior.

There are four more points worth to highlight here:

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