ritchie46 opened a new issue #295:
URL: https://github.com/apache/arrow-rs/issues/295
**Describe the bug**
When creating a boolean mask from a comparison operation on an array with
null values, the filter kernel yields a different result than when that boolean
mask, including null values, is created directly.
**To Reproduce**
```rust
fn test_null_mask() -> Result<()> {
use crate::compute::kernels::comparison;
let a: PrimitiveArray<Int64Type> =
PrimitiveArray::from(vec![Some(1), Some(2), None]);
let mask0 = comparison::eq(&a, &a)?;
let out0 = filter(&a, &mask0)?;
let out_arr0 =
out0.as_any().downcast_ref::<PrimitiveArray<Int64Type>>().unwrap();
let mask1 = BooleanArray::from(vec![Some(true), Some(true), None]);
let out1 = filter(&a, &mask1)?;
let out_arr1 =
out1.as_any().downcast_ref::<PrimitiveArray<Int64Type>>().unwrap();
assert_eq!(mask0, mask1); // assert succes
assert_eq!(out_arr0, out_arr1); // assert false
Ok(())
}
```
**Expected behavior**
Null values in the predicate mask should be ignored and not yield a result.
Which the kernel does correctly on boolean mask that are created directly.
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