nirandaperera commented on a change in pull request #10585:
URL: https://github.com/apache/arrow/pull/10585#discussion_r664587075
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File path: cpp/src/arrow/compute/kernels/vector_sort.cc
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@@ -477,6 +491,87 @@ class ArrayCountSorter {
}
};
+using ::arrow::internal::Bitmap;
+
+template <>
+class ArrayCountSorter<BooleanType> {
+ public:
+ ArrayCountSorter() = default;
+
+ // Returns where null starts.
+ uint64_t* Sort(uint64_t* indices_begin, uint64_t* indices_end,
+ const BooleanArray& values, int64_t offset,
+ const ArraySortOptions& options) {
+ // 32bit counter performs much better than 64bit one
+ if (values.length() < (1LL << 32)) {
+ return SortInternal<uint32_t>(indices_begin, indices_end, values,
offset, options);
+ } else {
+ return SortInternal<uint64_t>(indices_begin, indices_end, values,
offset, options);
+ }
+ }
+
+ private:
+ template <typename CounterType>
+ void CountBits(const BooleanArray& values, int64_t offset, CounterType*
set_count,
+ CounterType* null_count) {
Review comment:
Oh okay. I did this way because we can count both nulls and trues in a
single pass. But sure, I'll use that.
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