jorgecarleitao commented on a change in pull request #7967:
URL: https://github.com/apache/arrow/pull/7967#discussion_r471134987
##########
File path: rust/datafusion/src/execution/physical_plan/udf.rs
##########
@@ -37,8 +37,11 @@ pub type ScalarUdf = Arc<dyn Fn(&[ArrayRef]) ->
Result<ArrayRef> + Send + Sync>;
pub struct ScalarFunction {
/// Function name
pub name: String,
- /// Function argument meta-data
- pub args: Vec<Field>,
+ /// Set of valid argument types.
+ /// The first dimension (0) represents specific combinations of valid
argument types
+ /// The second dimension (1) represents the types of each argument.
+ /// For example, [[t1, t2]] is a function of 2 arguments that only accept
t1 on the first arg and t2 on the second
Review comment:
I believe that the current API uses `ScalarFunction`:
```
ctx.register_udf(ScalarFunction::new(
"custom_sqrt",
vec![vec![DataType::Float64]],
DataType::Float64,
Arc::new(custom_sqrt),
));
```
I do not like it, but I was trying not to change it until we land an
interface to declare UDFs sufficiently generic for our own UDFs with variable
types.
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