Arrow compute/dataset design doc missing

[Shawn Yang]

Hi, I'm considering using arrow compute as an execution kernel for our
distributed dataframe framework. I already read the great doc:
https://arrow.apache.org/docs/cpp/compute.html, but it is an usage doc. Is
there any design doc, inside introduction or benchmarks for arrow compute
so I can quickly understand how arrow compute works, what can be done and
what should be done by it? Or I should just read the code in
https://github.com/apache/arrow/tree/master/cpp/src/arrow/compute