milenkovicm commented on PR #10354:
URL: https://github.com/apache/datafusion/pull/10354#issuecomment-2098527849
Another option could be to make a simplify return optional closure
```
fn simplify(
&self
) -> Option<Box<dyn Fn(AggregateFunction) ->
datafusion_common::tree_node::Transformed<Expr>>> {
None
}
```
in this case expr_simplifier part would become:
```rust
Expr::AggregateFunction(AggregateFunction {
func_def: AggregateFunctionDefinition::UDF(ref udaf),
..
}) => {
match (udaf.simplify(), expr) {
(Some(simplify), Expr::AggregateFunction(a)) =>
simplify(a),
(_, e) => Transformed::no(e),
}
}
```
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