ozgrakkurt opened a new issue, #7702:
URL: https://github.com/apache/arrow-rs/issues/7702
Can create an array like this:
```rust
fn make_dense_union() -> ArrayRef {
let mut b = builder::UnionBuilder::new_dense();
b.append::<Float32Type>("ft", 69.69f32).unwrap();
b.append::<UInt32Type>("mint", 699).unwrap();
b.append_null::<Float32Type>("ft").unwrap();
Arc::new(b.build().unwrap())
}
```
And the child `ft` will have `nullable` set to `false` in the field schema.
It is because of this line:
https://github.com/apache/arrow-rs/blob/56ac4dc242abb36a438684470764fc8d72000e7c/arrow-array/src/builder/union_builder.rs#L302
Will file a PR
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