bjchambers opened a new issue #738:
URL: https://github.com/apache/arrow-rs/issues/738
**Describe the bug**
`unary` kernel doesn't respect the offset when determining the null buffer,
which means that the results are incorrect when applied to a slice.
**To Reproduce**
Steps to reproduce the behavior:
```
#[test]
fn test_unary_f64_slice() {
let input =
Float64Array::from(vec![Some(5.1f64), None, Some(6.8), None,
Some(7.2)]);
let input_slice = input.slice(1, 4);
let input_slice: &Float64Array = as_primitive_array(&input_slice);
let result = unary(input_slice, |n| n.round());
assert_eq!(
result,
Float64Array::from(vec![None, Some(7.0), None, Some(7.0)])
)
}
```
**Expected behavior**
The test should pass.
**Actual behavior**
The test fails:
```
thread 'compute::kernels::arity::tests::test_unary_f64_slice' panicked at
'assertion failed: `(left == right)`
left: `PrimitiveArray<Float64>
[
0.0,
null,
0.0,
null,
]`,
right: `PrimitiveArray<Float64>
[
null,
7.0,
null,
7.0,
]`', arrow/src/compute/kernels/arity.rs:88:9
```
**Additional context**
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