zhztheplayer opened a new pull request, #13251:
URL: https://github.com/apache/arrow/pull/13251

   ReservationListenableMemoryPool is a decorator of the underlying memory pool 
with its own mem counter. It should represent for the bytes reserved from 
itself rather than the underlying pool.
   
   E.g. a ReservationListenableMemoryPool `pool-a`  instance wraps the default 
pool, and default pool's allocation is now 1GB, `pool-a`'s allocation is 10MB, 
we should let `pool-a.bytes_allocated()` return 10MB rather than 1GB.


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