pitrou commented on a change in pull request #8623:
URL: https://github.com/apache/arrow/pull/8623#discussion_r520605189
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File path: cpp/src/arrow/compute/kernels/vector_sort.cc
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@@ -30,6 +32,58 @@ namespace internal {
namespace {
+// NOTE: std::partition is usually faster than std::stable_partition.
+
+struct NonStablePartitioner {
+ template <typename Predicate>
+ uint64_t* operator()(uint64_t* indices_begin, uint64_t* indices_end,
Predicate&& pred) {
+ return std::partition(indices_begin, indices_end,
std::forward<Predicate>(pred));
+ }
+};
+
+struct StablePartitioner {
+ template <typename Predicate>
+ uint64_t* operator()(uint64_t* indices_begin, uint64_t* indices_end,
Predicate&& pred) {
+ return std::stable_partition(indices_begin, indices_end,
+ std::forward<Predicate>(pred));
+ }
+};
+
+// Move Nulls to end of array. Return where Null starts.
+template <typename ArrayType, typename Partitioner>
Review comment:
@bkietz Apparently one can't use a template function as template
argument. Is that right?
(I originally wanted to pass `std::partition` as a template function
argument)
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