comphead commented on code in PR #16039:
URL: https://github.com/apache/datafusion/pull/16039#discussion_r2087285264
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datafusion/expr/src/udf.rs:
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@@ -451,7 +451,7 @@ pub trait ScalarUDFImpl: Debug + Send + Sync {
///
/// # Notes
///
- /// Most UDFs should implement [`Self::return_type`] and not this
+ /// Most UDFs can implement [`Self::return_type`] and not this
/// function as the output type for most functions only depends on the
types
/// of their inputs (e.g. `sqrt(f32)` is always `f32`).
Review Comment:
```suggestion
/// For the majority of UDFs, implementing [`Self::return_type`] is
sufficient,
/// as the result type is typically a deterministic function of the input
types
/// (e.g., `sqrt(f32)` consistently yields `f32`). Implementing this method
directly
/// is generally unnecessary unless the return type depends on runtime
values.
```
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