bjchambers opened a new issue #744:
URL: https://github.com/apache/arrow-rs/issues/744
**Describe the bug**
`length` kernel (for string length) doesn't work on sliced string arrays
containing null.
**To Reproduce**
Modify the existing tests to include null:
```
/// Tests with an offset
#[test]
fn bit_length_offsets() -> Result<()> {
let a = StringArray::from(vec![Some("hello"), Some(" "),
Some("world"), None]);
let b = a.slice(1, 3);
let result = bit_length(b.as_ref())?;
let result: &Int32Array = as_primitive_array(&result);
let expected = Int32Array::from(vec![Some(8), Some(40), None]);
assert_eq!(&expected, result);
Ok(())
}
```
**Expected behavior**
Test passes.
**Actual behavior**
Test does not pass.
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