[GitHub] [arrow-rs] jhorstmann opened a new issue #417: Boolean `not` kernel does not take offset of null buffer into account

[GitBox]

jhorstmann opened a new issue #417:
URL: https://github.com/apache/arrow-rs/issues/417


   **Describe the bug**
   The boolean not kernel does use `null_buffer.bits.slice(offset)` which takes 
a byte offset. This leads to wrong results and possible panics if the offset is 
not equal to 0.
   
   **To Reproduce**
   ```
   let a = BooleanArray::from(vec![None, Some(true), Some(false), None, 
Some(true)]);
   let a = a.slice(1, 4);
   let a = a.as_any().downcast_ref::<BooleanArray>().unwrap();
   let c = not(&a).unwrap();
   
   let expected = BooleanArray::from(vec![Some(false), Some(true), None, 
Some(false)]);
   
   assert_eq!(c, expected);
   ```
   
   **Expected behavior**
   The code should not panic and return the correct result by using the 
`bit_slice` method.
   


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