jayzhan211 commented on issue #14247:
URL: https://github.com/apache/datafusion/issues/14247#issuecomment-2611300978
> try to evolve incrementally, keep using DataType in many places, but add
metadata to more and more places incrementally. At the end of this, the code is
not beautiful (rather hard to reason about), and in the meantime it's not
correct
Evolving incrementally is the way to go. `logical-types` is an example that
it is quite an challenge for contributor and reviewer to keep it up until it
lands.
Consider the `logical type` support, we might switch to LogicalType trait in
the future, we can implement LogicalType for those extension types. In this
case, we don't need `Field`.
```rust
pub struct ReturnTypeArgs<'a> {
/// The data types of the arguments to the function
pub arg_types: &'a [Arc<dyn LogicalType>],
/// ...
pub scalar_arguments: &'a [Option<&'a ScalarValue>],
}
```
However, given `logical types` is still work in progress, and not clear
whether the assumption and the design makes sense at all, I think switching to
`Field` and incrementally evolve would be a better choice
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