tustvold commented on code in PR #3590:
URL: https://github.com/apache/arrow-rs/pull/3590#discussion_r1084526356
##########
arrow-select/src/nullif.rs:
##########
@@ -68,43 +68,41 @@ pub fn nullif(left: &dyn Array, right: &BooleanArray) ->
Result<ArrayRef, ArrowE
};
// Compute left null bitmap & !right
- let mut valid_count = 0;
- let combined = match left_data.null_buffer() {
+
+ let (combined, null_count) = match left_data.null_buffer() {
Some(left) => {
- bitwise_bin_op_helper(left, left_offset, &right, right_offset,
len, |l, r| {
- let t = l & !r;
- valid_count += t.count_ones() as usize;
- t
- })
+ let mut valid_count = 0;
+ let b =
+ bitwise_bin_op_helper(left, l_offset, &right, r_offset, len,
|l, r| {
+ let t = l & !r;
+ valid_count += t.count_ones() as usize;
+ t
+ });
+ (b, len - valid_count)
}
None => {
- let buffer = bitwise_unary_op_helper(&right, right_offset, len,
|b| {
+ let mut null_count = 0;
+ let buffer = bitwise_unary_op_helper(&right, r_offset, len, |b| {
let t = !b;
- valid_count += t.count_ones() as usize;
+ null_count += t.count_zeros() as usize;
Review Comment:
Nope, we instead exploit the property that the remainder bits will always be 0
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