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use sort_unstable_by in primitive sorting #552

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Jul 20, 2021
Merged

use sort_unstable_by in primitive sorting #552

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24 changes: 13 additions & 11 deletions arrow/src/compute/kernels/sort.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -94,13 +94,14 @@ pub fn sort_limit(
take(values.as_ref(), &indices, None)
}

/// we can only do this if the T is primitive
#[inline]
fn sort_by<T, F>(array: &mut [T], limit: usize, cmp: F)
fn sort_unstable_by<T, F>(array: &mut [T], limit: usize, cmp: F)
where
F: FnMut(&T, &T) -> Ordering,
{
if array.len() == limit {
array.sort_by(cmp);
array.sort_unstable_by(cmp);
} else {
partial_sort(array, limit, cmp);
}
Expand Down Expand Up @@ -437,11 +438,11 @@ fn sort_boolean(
.map(|index| (index, values.value(index as usize)))
.collect::<Vec<(u32, bool)>>();
if !descending {
sort_by(&mut valids, len.saturating_sub(nulls_len), |a, b| {
sort_unstable_by(&mut valids, len.saturating_sub(nulls_len), |a, b| {
cmp(a.1, b.1)
});
} else {
sort_by(&mut valids, len.saturating_sub(nulls_len), |a, b| {
sort_unstable_by(&mut valids, len.saturating_sub(nulls_len), |a, b| {
cmp(a.1, b.1).reverse()
});
}
Expand Down Expand Up @@ -531,11 +532,11 @@ where
len = limit.min(len);
}
if !descending {
sort_by(&mut valids, len.saturating_sub(nulls_len), |a, b| {
sort_unstable_by(&mut valids, len.saturating_sub(nulls_len), |a, b| {
cmp(a.1, b.1)
});
} else {
sort_by(&mut valids, len.saturating_sub(nulls_len), |a, b| {
sort_unstable_by(&mut valids, len.saturating_sub(nulls_len), |a, b| {
cmp(a.1, b.1).reverse()
});
// reverse to keep a stable ordering
Expand Down Expand Up @@ -669,11 +670,11 @@ where
len = limit.min(len);
}
if !descending {
sort_by(&mut valids, len.saturating_sub(nulls_len), |a, b| {
sort_unstable_by(&mut valids, len.saturating_sub(nulls_len), |a, b| {
cmp(a.1, b.1)
});
} else {
sort_by(&mut valids, len.saturating_sub(nulls_len), |a, b| {
sort_unstable_by(&mut valids, len.saturating_sub(nulls_len), |a, b| {
cmp(a.1, b.1).reverse()
});
// reverse to keep a stable ordering
Expand Down Expand Up @@ -735,11 +736,11 @@ where
len = limit.min(len);
}
if !descending {
sort_by(&mut valids, len.saturating_sub(nulls_len), |a, b| {
sort_unstable_by(&mut valids, len.saturating_sub(nulls_len), |a, b| {
cmp_array(a.1.as_ref(), b.1.as_ref())
});
} else {
sort_by(&mut valids, len.saturating_sub(nulls_len), |a, b| {
sort_unstable_by(&mut valids, len.saturating_sub(nulls_len), |a, b| {
cmp_array(a.1.as_ref(), b.1.as_ref()).reverse()
});
// reverse to keep a stable ordering
Expand Down Expand Up @@ -864,7 +865,8 @@ pub fn lexsort_to_indices(
}

let lexicographical_comparator = LexicographicalComparator::try_new(columns)?;
sort_by(&mut value_indices, len, |a, b| {
// uint32 can be sorted unstably
sort_unstable_by(&mut value_indices, len, |a, b| {
lexicographical_comparator.compare(a, b)
});

Expand Down