rluvaton opened a new issue, #9302:
URL: https://github.com/apache/arrow-rs/issues/9302
**Describe the bug**
You can create a `StructArray` with field marked as non nullable but the
child has nulls.
this should not be possible IMO as:
1. struct field nullability has no meaning
2. you can't have functions asserting non nullable field array has no nulls
**To Reproduce**
```rust
#[test]
fn reproduction() {
let child = Int8Array::from(vec![None]);
let child = Arc::new(child) as ArrayRef;
let struct_array = StructArray::try_new(
Fields::from(vec![
Field::new(
"f",
child.data_type().clone(),
// Note the false here
false
),
]),
vec![child],
// Creating null item
Some(NullBuffer::from(&[false])),
).expect_err("should fail as field nullability does not match the array
nullability");
}
```
**Expected behavior**
the test should pass and it should fail the creation of the `StructArray`
**Additional context**
changing this behavior will also require updating `ArrayData::new_null`
which pass nulls for the children of structs.
Also, I did not found any restriction in the arrow specification about that.
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