dhruv9vats commented on a change in pull request #12484:
URL: https://github.com/apache/arrow/pull/12484#discussion_r820456106
##########
File path: cpp/src/arrow/compute/kernels/hash_aggregate.cc
##########
@@ -2758,6 +2758,317 @@ struct GroupedOneFactory {
InputType argument_type;
};
+// ----------------------------------------------------------------------
+// List implementation
+
+template <typename Type, typename Enable = void>
+struct GroupedListImpl final : public GroupedAggregator {
+ using CType = typename TypeTraits<Type>::CType;
+ using GetSet = GroupedValueTraits<Type>;
+
+ Status Init(ExecContext* ctx, const std::vector<ValueDescr>&,
+ const FunctionOptions* options) override {
+ ctx_ = ctx;
+ // out_type_ initialized by GroupedListInit
+ values_ = TypedBufferBuilder<CType>(ctx_->memory_pool());
+ groups_ = TypedBufferBuilder<uint32_t>(ctx_->memory_pool());
+ values_bitmap_ = TypedBufferBuilder<bool>(ctx_->memory_pool());
+ return Status::OK();
+ }
+
+ Status Resize(int64_t new_num_groups) override {
+ num_groups_ = new_num_groups;
+ return Status::OK();
+ }
+
+ Status Consume(const ExecBatch& batch) override {
+ const auto* groups = batch[1].array()->GetValues<uint32_t>(1);
+ const auto* values = batch[0].array()->GetValues<CType>(1);
+ const auto* values_bitmap = batch[0].array()->GetValues<uint8_t>(0);
+ int64_t num_values = batch[1].array()->length;
+
+ num_args_ += num_values;
+ RETURN_NOT_OK(groups_.Append(groups, num_values));
+ RETURN_NOT_OK(values_.Append(values, num_values));
+
+ if (values_bitmap == nullptr) {
+ RETURN_NOT_OK(values_bitmap_.Append(num_values, true));
+ } else {
+ RETURN_NOT_OK(values_bitmap_.Reserve(num_values));
+ values_bitmap_.UnsafeAppend(values_bitmap, 0, num_values);
+ }
+ return Status::OK();
+ }
+
+ Status Merge(GroupedAggregator&& raw_other,
+ const ArrayData& group_id_mapping) override {
+ auto other = checked_cast<GroupedListImpl*>(&raw_other);
+ const auto* other_raw_groups = other->groups_.data();
+ const auto* g = group_id_mapping.GetValues<uint32_t>(1);
+
+ for (uint32_t other_g = 0; static_cast<int64_t>(other_g) <
other->num_args_;
+ ++other_g) {
+ RETURN_NOT_OK(groups_.Append(g[other_raw_groups[other_g]]));
+ }
Review comment:
Did give `TransposeInts` a try, but it needed raw `uint8_t*` pointers.
So if using it is preferred, how would one retrieve the raw pointers from
TypedBufferBuilder, as doing something like:
```
reinterpret_cast<uint8_t*>(groups_.data());
```
throws this error:
```
Reinterpret_cast from 'const unsigned int *' to 'uint8_t *' (aka 'unsigned
char *') casts away qualifiers
```
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