felipecrv commented on issue #40686:
URL: https://github.com/apache/arrow/issues/40686#issuecomment-2015741172

   These functions are very likely to fail.
   
   > The xallocx() function returns the real size of the resulting resized 
allocation pointed to by ptr, which is a value less than size if the allocation 
could not be adequately grown in place.
   
   I don't understand why using these to implement `MemoryPool::Reallocate` is 
not enough.
   


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