cetra3 opened a new pull request, #20382:
URL: https://github.com/apache/datafusion/pull/20382

   ## Which issue does this PR close?
   
   No issue raised
   
   ## Rationale for this change
   
   `try_shrink` never released any memory from the pool, and so would cause a 
"memory leak"
   
   ## What changes are included in this PR?
   
   A few changes to `MemoryReservation`
   
   ## Are these changes tested?
   
   Yes & new test has been added
   
   ## Are there any user-facing changes?
   
   Nope


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