AdamGS opened a new issue, #9701:
URL: https://github.com/apache/arrow-rs/issues/9701
Realized this issue while working on #9610, basically something like the
following test will fail because the null buffer gets dropped without applying
it to the data itself.
```rust
#[test]
fn
test_variant_get_perfectly_shredded_binary_preserves_top_level_nulls() {
let metadata =
BinaryViewArray::from_iter_values(std::iter::repeat_n(EMPTY_VARIANT_METADATA_BYTES,
3));
let typed_value: ArrayRef = Arc::new(BinaryArray::from(vec![
Some(b"Apache" as &[u8]),
Some(b"masked-null" as &[u8]),
Some(b"Parquet-variant" as &[u8]),
]));
let variant_array: ArrayRef = VariantArray::from_parts(
Arc::new(metadata) as _,
None,
Some(typed_value),
Some(NullBuffer::from(vec![true, false, true])),
)
.into();
let result = variant_get(
&variant_array,
GetOptions::new().with_as_type(Some(FieldRef::from(Field::new(
"result",
DataType::Binary,
true,
)))),
)
.unwrap();
let result = result.as_binary::<i32>();
assert_eq!(result.len(), 3);
assert_eq!(result.null_count(), 1); // This will be 0
}
```
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