bjchambers opened a new issue #807:
URL: https://github.com/apache/arrow-rs/issues/807
**Describe the bug**
Because `buf.bit_slice(...)` falls back to a slice that ignores the length
when the offset is byte-aligned, the resulting buffer has an incorrect length.
This leads to problems when applying bitwise operations such as `&`, for
instance.
**To Reproduce**
The following test fails:
```
#[test]
fn test_bit_slice_aligned() {
let buf = Buffer::from(&[2, 4, 6, 8, 10]);
let slice = buf.bit_slice(8, 8);
let expected = Buffer::from(&[4]);
assert_eq!(slice.len(), 1); // actual length is 4!!
assert_eq!(&slice, &expected);
}
```
**Expected behavior**
Test passes.
**Additional context**
Add any other context about the problem here.
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