Use concat to simplify Struct scalar creation #9145
Description
What do you think about using https://docs.rs/arrow/latest/arrow/compute/kernels/concat/index.html here? I think you should be able to simply concat the arrays together without having to have special handling (and if concat doesn't support `StructArray` we can potentially file a ticket upstream in arrow-rs)
Originally posted by @alamb in #7893 (comment)