xborder opened a new pull request, #954:
URL: https://github.com/apache/arrow-java/pull/954

   ## What's Changed
   
   - The branch removes the previous reflection-based access to internal gRPC 
buffers and replaces it with supported gRPC interfaces (Detachable, 
HasByteBuffer) to safely transfer ownership of direct buffers to Arrow without 
copying.
   - gRPC direct ByteBuffer streams are detached and wrapped as 
ForeignAllocation for zero‑copy reads
   - Fall back to safe buffer copies when gRPC does not expose a direct 
ByteBuffer or data is fragmented
   - Added test coverage 
   
   Closes #939.
   


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