Prashanth Govindarajan created ARROW-4956:
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             Summary: Allow ArrowBuffers to wrap external Memory in C#
                 Key: ARROW-4956
                 URL: https://issues.apache.org/jira/browse/ARROW-4956
             Project: Apache Arrow
          Issue Type: Task
          Components: C#
            Reporter: Prashanth Govindarajan


At the moment, the C# ArrowBuffer implementation is immutable. The only way to 
build it is through the provided builders. It also ought to be able to wrap 
external memory as a zero copy op. The C++ implementation exposes this as a 
GetMutableValue() method. Example use cases are similar to when a NumPy array 
is wrapped in an ArrowBuffer in pyArrow.



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