[C++] Missing kernel for replace_with_mask with halffloat

[spenczar]

Describe the enhancement requested

There might well be an umbrella issue for this. But with pyarrow, pa.compute.replace_with_mask is currently lacking a kernel for filling in halffloat values. I get a pyarrow.lib.ArrowNotImplementedError: Function 'replace_with_mask' has no kernel matching input types (halffloat, bool, halffloat) error when I try.

Component(s)

Python

[js8544]

The support for half float type is extremely limited at the moment. I don't think there is any function that supports it? There is a recent discussion though: #22806.

[pitrou]

For many purposes such as copying values, float16 type can be treated as an opaque type and handled internally just like uint16. So this feature request and other similar ones could probably be addressed easily.