Wes McKinney created ARROW-4567:
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             Summary: [C++] Convert Scalar values to Array values with length 1
                 Key: ARROW-4567
                 URL: https://issues.apache.org/jira/browse/ARROW-4567
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C++
            Reporter: Wes McKinney
             Fix For: 0.14.0


A common approach to performing operations on both scalar and array values is 
to treat a Scalar as an array of length 1. For example, we cannot currently use 
our Cast kernels to cast a Scalar. It would be senseless to create separate 
kernel implementations specialized for a single value, and much easier to 
promote a scalar to an Array, execute the kernel, then unbox the result back 
into a Scalar



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