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https://issues.apache.org/jira/browse/ARROW-4567?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney closed ARROW-4567.
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Resolution: Won't Fix
We'll deal with Scalar as a first class citizen in the compute algebra for
executing array kernels
> [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
> Priority: Major
>
> 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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