pitrou commented on code in PR #13334:
URL: https://github.com/apache/arrow/pull/13334#discussion_r911022350
##########
cpp/src/arrow/compute/kernels/vector_array_sort.cc:
##########
@@ -172,6 +173,85 @@ class ArrayCompareSorter {
}
};
+template <>
+class ArrayCompareSorter<DictionaryType> {
+ struct DictionaryInternal {
+ NullPartitionResult p;
+ const std::shared_ptr<Array>& values;
+ const std::shared_ptr<Array>& indices;
+ const UInt64Array& indices_values;
+ const ArraySortOptions& options;
+ int64_t offset;
+
+ Status Visit(const DataType& index_type) {
+ return Status::TypeError("Dictionary sorting not supported for index
type ",
+ index_type.ToString());
+ }
+
+ template <typename IndexType>
+ enable_if_t<is_integer_type<IndexType>::value, Status> Visit(
+ const IndexType& index_type) {
+ return SortInternal<IndexType>();
+ }
+
+ template <typename IndexType>
+ Status SortInternal() {
+ using ArrayType = typename TypeTraits<IndexType>::ArrayType;
+ using GetView = GetViewType<IndexType>;
+ const auto& indices_array = checked_cast<const ArrayType&>(*indices);
+
+ std::vector<uint64_t> sort_order(indices_values.length());
+ uint64_t cur = 0;
+ auto cur_idx =
GetViewType<UInt64Type>::LogicalValue(indices_values.GetView(cur));
+ auto cur_val = values->GetScalar(cur_idx);
+ for (int i = 0; i < indices_values.length(); i++) {
+ auto tmp_idx =
GetViewType<UInt64Type>::LogicalValue(indices_values.GetView(i));
+ auto tmp_val = values->GetScalar(tmp_idx);
+ if (cur_val != tmp_val) {
+ cur = i;
+ cur_val = tmp_val;
+ }
+ sort_order[tmp_idx] = cur;
+ }
+
+ std::stable_sort(
+ this->p.non_nulls_begin, this->p.non_nulls_end,
+ [&](uint64_t left, uint64_t right) {
+ const auto lhs = GetView::LogicalValue(indices_array.GetView(left
- offset));
+ const auto rhs = GetView::LogicalValue(indices_array.GetView(right
- offset));
+ return sort_order[lhs] < sort_order[rhs];
+ });
+
+ return Status::OK();
+ }
+
+ Result<NullPartitionResult> Make(const std::shared_ptr<DataType>&
index_type) {
+ RETURN_NOT_OK(VisitTypeInline(*index_type, this));
+ return std::move(p);
+ }
+ };
+
+ public:
+ NullPartitionResult operator()(uint64_t* indices_begin, uint64_t*
indices_end,
+ const Array& array, int64_t offset,
+ const ArraySortOptions& options) {
+ const auto& dict_array = checked_cast<const DictionaryArray&>(array);
+ const auto& values = dict_array.dictionary();
+ const auto& indices = dict_array.indices();
+ const auto& index_type = dict_array.dict_type()->index_type();
+
+ NullPartitionResult p = PartitionNulls<DictionaryArray, StablePartitioner>(
+ indices_begin, indices_end, dict_array, offset,
options.null_placement);
+ auto indices_array =
+ CallFunction("array_sort_indices", {values},
&options).ValueOrDie().make_array();
+
+ const auto& indices_values = checked_cast<const
UInt64Array&>(*indices_array);
Review Comment:
This will fail if `index_type` is not `UInt64Type`. You should instead do
the appropriate cast in `SortInternal` above.
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