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https://issues.apache.org/jira/browse/ARROW-16757?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney resolved ARROW-16757.
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Fix Version/s: 9.0.0
Resolution: Fixed
Issue resolved by pull request 13521
[https://github.com/apache/arrow/pull/13521]
> [C++] Remove "scalar" output modality from array kernels
> --------------------------------------------------------
>
> Key: ARROW-16757
> URL: https://issues.apache.org/jira/browse/ARROW-16757
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Wes McKinney
> Assignee: Wes McKinney
> Priority: Major
> Labels: pull-request-available
> Fix For: 9.0.0
>
> Time Spent: 5h 10m
> Remaining Estimate: 0h
>
> Supporting scalar outputs from array kernels (where all the inputs are
> scalars) introduces needless complexity into the kernel implementations,
> causing duplication of effort and excess code generation for paltry benefit.
> In the scenario where all inputs are scalars, it would be better to promote
> them all to arrays of length 1 (either by creating the arrays or constructing
> an appropriate ArraySpan per ARROW-16756) and invoking the array code path.
> This would enable us to delete thousands of lines of code and ease the
> ongoing development and maintenance of the array kernels codebase
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