Can you explain how these are useful?

Can you explain how these are useful?

Arrow's type system has many types, and projects building operations across Arrow data (comparisons, casts, aggregations) benefit from generating type-specialized code rather than hand-writing implementations for each type.

The TDD files provide a machine-readable definition of Arrow's types that enables this. Including them in the distribution allows downstream projects to generate code that stays in sync as Arrow's type system evolves.

Thanks! Can this rationale be documented in the code itself?

I added a comment about the usefulness of the codegen files.

Ah, I would've expected it next to the build config, sorry for being unclear 😅

Thanks for the details @telemenar and @lriggs .

Can we add a note in the docs folder, quickly documenting this ?

It's a good enhancement to me, we should give a bit of context for the users 😄

Thanks. I added a few notes.