tustvold commented on a change in pull request #1248:
URL: https://github.com/apache/arrow-rs/pull/1248#discussion_r801071624
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File path: arrow/src/compute/kernels/filter.rs
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@@ -119,17 +155,83 @@ 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 least selective
predicates (which keep most
Review comment:
I _think_ a filter with high selectivity is considered to be not very
selective, i.e. it isn't very discerning about what it selects. However, this
terminology seems to be a source of a lot of confusion, myself included, so I'm
just going to reword it :laughing:
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