gruuya commented on issue #13481:
URL: https://github.com/apache/datafusion/issues/13481#issuecomment-2489339715
To reiterate, the real check for a fix here should be passing test like this
```rust
#[test]
fn test_simplify_cast_list() {
use datafusion_functions_nested::expr_fn::make_array;
let element_field = Arc::new(Field::new("element", DataType::Int32,
true));
let items_field =
Field::new("items", DataType::List(element_field.clone()), true);
let schema = Schema::new(vec![items_field.clone()])
.to_dfschema()
.unwrap();
let input = cast(
make_array(vec![lit(2), lit(3)]),
DataType::List(element_field.clone()),
);
let output = simplify(input.clone());
assert_eq!(
input.data_type_and_nullable(&schema).unwrap(),
output.data_type_and_nullable(&schema).unwrap(),
);
}
```
In other words we'd want the type and nullability to remain the same after
simplification.
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