add min and max kernel

[jimexist]

Which issue does this PR close?

• Closes compute::ord kernel for getting min and max of two scalar/array values #4347

Rationale for this change

What changes are included in this PR?

Are there any user-facing changes?

[tustvold]

These kernels already exist in arrow-arithmetic I think?

Also FYI I'm working on a rework of the way we represent scalars in arrow-rs - see #1047

Edit: i see now the difference, I think this should be implemented in DF as a comparison kernel followed by a selection kernel. This will help keep code bloat down

https://docs.rs/arrow-select/latest/arrow_select/zip/fn.zip.html should do what you want

[jimexist]

These kernels already exist in arrow-arithmetic I think?

Also FYI I'm working on a rework of the way we represent scalars in arrow-rs - see #1047

Edit: i see now the difference, I think this should be implemented in DF as a comparison kernel followed by a selection kernel. This will help keep code bloat down

https://docs.rs/arrow-select/latest/arrow_select/zip/fn.zip.html should do what you want

Thanks for the advice I have already done that in https://github.com/apache/arrow-datafusion/pull/6527/files