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https://issues.apache.org/jira/browse/ARROW-7860?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Neal Richardson resolved ARROW-7860.
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Resolution: Duplicate
> [C++] Support cast to/from halffloat
> ------------------------------------
>
> Key: ARROW-7860
> URL: https://issues.apache.org/jira/browse/ARROW-7860
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++, C++ - Compute
> Reporter: Neal Richardson
> Priority: Major
> Fix For: 1.0.0
>
>
> In trying to do ARROW-7753 I realized I couldn't make a halffloat. I tried
> creating a float64 (as R does naturally) and casting to float16, but it's not
> implemented. Looking at compute/kernels/cast.cc, and the associated source in
> compute/kernels/generated/codegen.py, {{FLOATING_TYPES = ['Float',
> 'Double']}}. Maybe halffloat just needs to be added there?
> Aside: searching through the code, it seems that this limitation of float
> types to float32 and float64 is the norm.
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