Wes McKinney created ARROW-1485:
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             Summary: [C++] Implement union-like data type for accommodating 
kernel arguments which may be scalars or arrays
                 Key: ARROW-1485
                 URL: https://issues.apache.org/jira/browse/ARROW-1485
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C++
            Reporter: Wes McKinney


For example, either argument to the binary operator {{Add}} may be scalar or 
array. Some systems have addressed this issue by using arrays of length 1, but 
I would prefer that we accommodate this in Arrow's C++ data types



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