mbrobbel commented on PR #5176: URL: https://github.com/apache/arrow-rs/pull/5176#issuecomment-1843146392
> > Unless I'm mistaken this is following the Arrow spec > > I'm not aware of a part of the arrow specification calling for a pointer width type, i.e. `usize` or `isize`, nor an unsigned 128-bit integer? The physical fixed-size primitive memory layout supports: ["values each having the same physical slot width typically measured in bytes"](https://github.com/apache/arrow/blob/92723f34f8df40b35e5840e61011c00766808014/docs/source/format/Columnar.rst?plain=1#L243-L244). `u128`, `isize`, `usize` (and `[T: ArrowNativeType; N]`) are types for values each having the same physical slot width, meaning that custom logical types should be able to use them in that physical memory layout I think. For example, consider a custom UUID extension type. It could be stored in a fixed-size list layout (as suggested in the docs), but it's also valid to store it in a fixed-size primitive layout (using `u128`s). -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
