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Fix bug with null buffer offset in boolean not kernel #418

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merged 1 commit into from
Jun 8, 2021
Merged

Fix bug with null buffer offset in boolean not kernel #418

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15 changes: 14 additions & 1 deletion arrow/src/compute/kernels/boolean.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -376,7 +376,7 @@ pub fn not(left: &BooleanArray) -> Result<BooleanArray> {
let null_bit_buffer = data
.null_bitmap()
.as_ref()
.map(|b| b.bits.slice(left_offset));
.map(|b| b.bits.bit_slice(left_offset, len));

let values = buffer_unary_not(&data.buffers()[0], left_offset, len);

Expand Down Expand Up @@ -813,6 +813,19 @@ mod tests {
assert_eq!(c, expected);
}

#[test]
fn test_bool_array_not_sliced() {
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For anyone interested, without the code change this test fails in the following way:


---- compute::kernels::boolean::tests::test_bool_array_not_sliced stdout ----
thread 'compute::kernels::boolean::tests::test_bool_array_not_sliced' panicked at 'assertion failed: ceil(offset + len, 8) <= buffer.len() * 8', arrow/src/util/bit_chunk_iterator.rs:33:9


failures:
    compute::kernels::boolean::tests::test_bool_array_not_sliced

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);
}

#[test]
fn test_bool_array_and_nulls() {
let a = BooleanArray::from(vec![
Expand Down