tustvold commented on code in PR #5086:
URL: https://github.com/apache/arrow-rs/pull/5086#discussion_r1398272017
##########
arrow-select/src/zip.rs:
##########
@@ -56,15 +76,36 @@ pub fn zip(
SlicesIterator::new(mask).for_each(|(start, end)| {
// the gap needs to be filled with falsy values
if start > filled {
- mutable.extend(1, filled, start);
+ if falsy_is_scalar {
+ for _ in filled..start {
+ // Copy the first item from the 'falsy' array into the
output buffer.
+ mutable.extend(1, 0, 1);
Review Comment:
This is kind of unfortunate, but there aren't really many good alternatives
that occur to me. Ultimately if this kernel shows up a bottleneck, it should be
relatively straightforward to special case for primitives, etc... like we do
for the other selection kernels
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