jayzhan211 commented on PR #10560:
URL: https://github.com/apache/datafusion/pull/10560#issuecomment-2154664764
> ```rust
> AggregateExt
> ```
I don't think I get the point
I think we can get the AggregateFunction from the result of `call`
```rust
pub fn call(&self, args: Vec<Expr>) -> Expr {
Expr::AggregateFunction(AggregateFunction::new_udf(
Arc::new(self.clone()),
args,
false,
None,
None,
None,
))
}
```
The introduced extension functions are used for modifying AggregateFunction
*in-place*. Therefore, we don't need additional check for this.
Unless, we want to handle error for arbitrary `Expr`. For example, if
Expr::ScalarFunction go through the extension functions and we could get a
unexpected `Expr` silently or even panic. Is it the reason why we need
`build()`?
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