mrkn commented on a change in pull request #8612:
URL: https://github.com/apache/arrow/pull/8612#discussion_r519569356
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File path: cpp/src/arrow/compute/kernels/vector_sort.cc
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@@ -125,35 +128,43 @@ class CompareSorter {
std::stable_partition(indices_begin, indices_end,
[&values](uint64_t ind) { return
!values.IsNull(ind); });
}
- std::stable_sort(indices_begin, nulls_begin,
- [&values](uint64_t left, uint64_t right) {
- return values.GetView(left) < values.GetView(right);
- });
+ if (options.order == SortOrder::ASCENDING) {
+ std::stable_sort(indices_begin, nulls_begin,
+ [&values](uint64_t left, uint64_t right) {
+ return values.GetView(left) < values.GetView(right);
+ });
+ } else {
+ std::stable_sort(indices_begin, nulls_begin,
+ [&values](uint64_t left, uint64_t right) {
+ return values.GetView(left) > values.GetView(right);
Review comment:
This requires that all of `==`, `<`, and `>` are implemented in the
value type.
Instead, writing `right < left` here only requires `==` and `<`.
IMHO, requiring only `==` and `<` is better to support extension types in
the future.
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