alamb commented on code in PR #2194:
URL: https://github.com/apache/arrow-rs/pull/2194#discussion_r931562098
##########
arrow/src/array/equal/boolean.rs:
##########
@@ -75,20 +77,14 @@ pub(super) fn boolean_equal(
} else {
// get a ref of the null buffer bytes, to use in testing for nullness
let lhs_null_bytes = lhs.null_buffer().as_ref().unwrap().as_slice();
- let rhs_null_bytes = rhs.null_buffer().as_ref().unwrap().as_slice();
let lhs_start = lhs.offset() + lhs_start;
let rhs_start = rhs.offset() + rhs_start;
- (0..len).all(|i| {
+ BitIndexIterator::new(lhs_null_bytes, lhs_start, len).all(|i| {
Review Comment:
Is this correct? It seems like it will would not find positions where `rhs`
was null but `lhs` was not. Maybe I mis understand something
It seems like we need to iterate over the positions where either is set --
like `lhs_null_bytes | rhs_null_bytes`?
Maybe there is a lack of test coverage 🤔
##########
arrow/src/array/data.rs:
##########
@@ -2865,4 +2881,15 @@ mod tests {
let err = data.validate_values().unwrap_err();
assert_eq!(err.to_string(), "Invalid argument error: Offset invariant
failure: offset at position 1 out of bounds: 3 > 2");
}
+
+ #[test]
+ fn test_contains_nulls() {
+ let buffer: Buffer =
Review Comment:
I wonder if using a buffer with more than 64 bits is important (or is that
already well enough covered in `BitSliceIterator` tests)?
##########
arrow/src/array/equal/boolean.rs:
##########
@@ -75,20 +77,14 @@ pub(super) fn boolean_equal(
} else {
// get a ref of the null buffer bytes, to use in testing for nullness
let lhs_null_bytes = lhs.null_buffer().as_ref().unwrap().as_slice();
- let rhs_null_bytes = rhs.null_buffer().as_ref().unwrap().as_slice();
let lhs_start = lhs.offset() + lhs_start;
let rhs_start = rhs.offset() + rhs_start;
- (0..len).all(|i| {
+ BitIndexIterator::new(lhs_null_bytes, lhs_start, len).all(|i| {
Review Comment:
Or maybe you can just call `equal_bits` here?
##########
arrow/src/array/data.rs:
##########
@@ -37,6 +38,21 @@ use std::sync::Arc;
use super::equal::equal;
+#[inline]
+pub(crate) fn contains_nulls(
Review Comment:
Given the potential usefulness (and non obviousness) of using
`BitSliceIterator` to check for nulls, I wonder what you think about making
this a function on `BitSliceIterator` such as
`BitSliceIterator::contains_only_unset_bits` or something?
##########
arrow/src/array/data.rs:
##########
@@ -37,6 +38,21 @@ use std::sync::Arc;
use super::equal::equal;
+#[inline]
+pub(crate) fn contains_nulls(
Review Comment:
Given the never ending confusion about "is this a size in bits or bytes" I
recommend making it explicit -- either add a docstring that says `offset` and
`len` are in `bits` or perhaps name them `bit_offset` and `bit_len`.
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