joseph-isaacs commented on issue #12819:
URL: https://github.com/apache/datafusion/issues/12819#issuecomment-2431555898
I am sorry for my previous response it was not quite what I was asking for.
I think _your_ proposed solution is?
```rust
fn invoke(&self, args: &[ColumnarValue]) -> DFResult<ColumnarValue> {
let arg_types = args.iter().map(|cv| cv.data_type()).collect_vec();
let return_type = self.return_type(&arg_types)?;
...
}
```
I was hoping to use the result of `return_type_from_exprs(self, &[Expr],
&dyn ExprSchema, &[DataType])` (in invoke) since I call
`expr.data_type_and_nullable(schema)?` on the inputs to get the correct
nullability.
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