[jira] [Created] (ARROW-5277) [C#] MemoryAllocator.Allocate(length: 0) should not return null

[Eric Erhardt (JIRA)]

Eric Erhardt created ARROW-5277:
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             Summary: [C#] MemoryAllocator.Allocate(length: 0) should not 
return null
                 Key: ARROW-5277
                 URL: https://issues.apache.org/jira/browse/ARROW-5277
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C#
            Reporter: Eric Erhardt


See the conversation 
[here|https://github.com/apache/arrow/pull/3925#discussion_r281187184].

We should change MemoryAllocator to not return `null` when the requested memory 
length is `0`. Instead, we should create a cached "NullObject" IMemoryOwner 
that has a no-op `Dispose` method, and always returns `Memory<T>.Empty`.

This way consuming code doesn't need to check for `null` being returned from 
MemoryAllocator.Allocate.



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