medwards commented on a change in pull request #236:
URL: https://github.com/apache/arrow-rs/pull/236#discussion_r623297164
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File path: arrow/src/compute/kernels/sort.rs
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@@ -487,24 +487,27 @@ where
len = limit.min(len);
}
if !descending {
- sort_by(&mut valids, len - nulls_len, |a, b| cmp(a.1, b.1));
+ sort_by(&mut valids, len.saturating_sub(nulls_len), |a, b| {
Review comment:
Looking at your diff I think one of us has misunderstood the expected
behaviour. I think the result should be `ArrayData` truncated to the limit as
if the full input was sorted, with some control over whether nulls are ordered
before or after real values.
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