milenkovicm commented on PR #10354:
URL: https://github.com/apache/datafusion/pull/10354#issuecomment-2102706142
> > We're on the same page @jayzhan211
>
> If we don't need `Expr` for simplified UDAF, than we can have
>
> ```rust
> pub fn simplify(
> &self,
> args: AggregateArgs,
> info: &dyn SimplifyInfo,
> ) -> Result<Transformed<AggregateArgs>> {}
> ```
>
> I think the next problem is whether we need `Expr` or just
`AggregateArgs`. The former can let us return the UDAF with a different
function. But for this kind of function rewrite, we can handle it in
`FuncitonWrite`. You can take `ArrayFunctionRewriter` for example.
>
> @milenkovicm
I think we need Expr, this way we can replace function with something else
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