Jefffrey commented on code in PR #22516:
URL: https://github.com/apache/datafusion/pull/22516#discussion_r3314806607
##########
datafusion/functions/src/macros.rs:
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Review Comment:
we could simplify as so too
```rust
fn return_type(&self, arg_types: &[DataType]) -> Result<DataType> {
Ok(arg_types[0].clone())
}
```
since args are already coerced by this point
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