fallintoplace opened a new pull request, #947:
URL: https://github.com/apache/arrow-go/pull/947

   ### Rationale for this change
   
   `Buffer.Reset` replaced an allocator-owned slice directly. That leaked the 
old allocation and later caused `Release` to pass the caller's slice to the 
allocator.
   
   ### What changes are included in this PR?
   
   When a buffer has an allocator, resize its owned storage and copy the 
replacement data into it. Non-owning buffers keep the existing zero-copy reset 
behavior.
   
   ### Are these changes tested?
   
   Yes. The regression test resets an allocated buffer from an unrelated slice, 
verifies the data is copied, releases the buffer, and checks allocator 
accounting. `go test ./arrow/memory` passes.
   
   ### Are there any user-facing changes?
   
   Resetting an allocator-backed buffer now copies the supplied data so 
ownership and release behavior remain valid.


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