andygrove commented on issue #13702:
URL: https://github.com/apache/datafusion/issues/13702#issuecomment-2532101507
`ScalarUDFImpl.return_type` is part of DataFusion's public API but returns
an internal error if called, which doesn't seem correct. Should we deprecate
this function and change the error type?
```
fn return_type(&self, _arg_types: &[DataType]) -> Result<DataType> {
internal_err!("return_type_from_exprs shoud be called instead")
}
```
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