AdamGS opened a new issue, #25120:
URL: https://github.com/apache/datafusion/issues/25120
### Describe the bug
If we have a nested struct array, we only take the leaf nullability into
account, instead of of an `AND` of all parent nullability.
### To Reproduce
```rust
let inner_array = StructArray::new(
vec![Field::new("value", DataType::Int32, false)].into(),
vec![Arc::new(Int32Array::from(vec![1, 2, 3]))],
None,
);
// Only the outer struct marks row 1 as null; its children are all valid.
let outer_array = StructArray::new(
vec![Field::new("inner", inner_array.data_type().clone(),
false)].into(),
vec![Arc::new(inner_array)],
Some(NullBuffer::from(vec![true, false, true])),
);
```
If we try and get `outer['inner']['value']`, we currently get `[1, 2, 3]`
instead of `[1, null, 3]`.
### Expected behavior
_No response_
### Additional context
_No response_
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