Neal Richardson resolved ARROW-7860.
    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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