WillAyd commented on code in PR #12963:
URL: https://github.com/apache/arrow/pull/12963#discussion_r885846363
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cpp/src/arrow/compute/kernels/vector_sort.cc:
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@@ -1909,6 +1909,220 @@ class SelectKUnstableMetaFunction : public MetaFunction
{
}
};
+// ----------------------------------------------------------------------
+// Rank implementation
+
+const RankOptions* GetDefaultRankOptions() {
+ static const auto kDefaultRankOptions = RankOptions::Defaults();
+ return &kDefaultRankOptions;
+}
+
+class ArrayRanker : public TypeVisitor {
+ public:
+ ArrayRanker(ExecContext* ctx, const Array& array, const ArrayRankOptions&
options,
+ Datum* output)
+ : TypeVisitor(),
+ ctx_(ctx),
+ array_(array),
+ order_(options.order),
+ null_placement_(options.null_placement),
+ tiebreaker_(options.tiebreaker),
+ physical_type_(GetPhysicalType(array.type())),
+ output_(output) {}
+
+ Status Run() { return physical_type_->Accept(this); }
+
+#define VISIT(TYPE) \
+ Status Visit(const TYPE& type) { return RankInternal<TYPE>(); }
+
+ VISIT_SORTABLE_PHYSICAL_TYPES(VISIT)
+
+#undef VISIT
+
+ template <typename InType>
+ Status RankInternal() {
+ using GetView = GetViewType<InType>;
+ using T = typename GetViewType<InType>::T;
+ using ArrayType = typename TypeTraits<InType>::ArrayType;
+
+ ArrayType arr(array_.data());
+ ArraySortOptions array_options(order_, null_placement_);
+
+ auto length = array_.length();
+ ARROW_ASSIGN_OR_RAISE(auto sort_indices,
+ MakeMutableUInt64Array(uint64(), length,
ctx_->memory_pool()));
+ auto sort_begin = sort_indices->GetMutableValues<uint64_t>(1);
+ auto sort_end = sort_begin + length;
+ std::iota(sort_begin, sort_end, 0);
+
+ ARROW_ASSIGN_OR_RAISE(auto array_sorter, GetArraySorter(*physical_type_));
+
+ NullPartitionResult sorted =
+ array_sorter(sort_begin, sort_end, arr, 0, array_options);
+ uint64_t rank = 0;
+
+ ARROW_ASSIGN_OR_RAISE(auto rankings,
+ MakeMutableUInt64Array(uint64(), length,
ctx_->memory_pool()));
+ auto out_begin = rankings->GetMutableValues<uint64_t>(1);
+
+ switch (tiebreaker_) {
+ case RankOptions::Dense: {
+ T curr_value, prev_value;
+ if (null_placement_ == NullPlacement::AtStart && sorted.null_count() >
0) {
+ rank++;
+ for (auto it = sorted.nulls_begin; it < sorted.nulls_end; it++) {
+ out_begin[*it] = rank;
+ }
+ }
+
+ for (auto it = sorted.non_nulls_begin; it < sorted.non_nulls_end;
it++) {
+ curr_value = GetView::LogicalValue(arr.GetView(*it));
+ if (it == sorted.non_nulls_begin || curr_value != prev_value) {
+ rank++;
+ }
+
+ out_begin[*it] = rank;
+ prev_value = curr_value;
+ }
+
+ if (null_placement_ == NullPlacement::AtEnd) {
+ rank++;
+ for (auto it = sorted.nulls_begin; it < sorted.nulls_end; it++) {
+ out_begin[*it] = rank;
+ }
+ }
+ break;
+ }
+ case RankOptions::First: {
+ for (auto it = sorted.overall_begin(); it < sorted.overall_end();
it++) {
+ out_begin[*it] = ++rank;
+ }
+ break;
+ }
+ case RankOptions::Min: {
+ T curr_value, prev_value;
+
+ if (null_placement_ == NullPlacement::AtStart) {
+ rank++;
+ for (auto it = sorted.nulls_begin; it < sorted.nulls_end; it++) {
+ out_begin[*it] = rank;
+ }
+ }
+
+ for (auto it = sorted.non_nulls_begin; it < sorted.non_nulls_end;
it++) {
+ curr_value = GetView::LogicalValue(arr.GetView(*it));
+ if (it == sorted.non_nulls_begin || it == sorted.non_nulls_end ||
Review Comment:
This would be true on the first loop
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