tustvold commented on a change in pull request #1248:
URL: https://github.com/apache/arrow-rs/pull/1248#discussion_r799312437
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File path: arrow/src/compute/kernels/filter.rs
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@@ -119,17 +147,83 @@ impl<'a> Iterator for SlicesIterator<'a> {
}
}
+/// An iterator of `usize` whose index in [`BooleanArray`] is true
+///
+/// This provides the best performance on all but the most selective
predicates, where the
Review comment:
Yeah, highly selective means low selectivity. Selectivity is a measure
of how many rows it selects, selective-ness is a measure of how few rows it
selects. Or something like that... This terminology is still new to me :smile:
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