icexelloss commented on code in PR #34311:
URL: https://github.com/apache/arrow/pull/34311#discussion_r1123736880
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cpp/src/arrow/compute/row/grouper.cc:
##########
@@ -39,12 +43,336 @@
namespace arrow {
using internal::checked_cast;
+using internal::PrimitiveScalarBase;
namespace compute {
namespace {
-struct GrouperImpl : Grouper {
+constexpr uint32_t kNoGroupId = std::numeric_limits<uint32_t>::max();
+
+using group_id_t = std::remove_const<decltype(kNoGroupId)>::type;
+using GroupIdType = CTypeTraits<group_id_t>::ArrowType;
+auto g_group_id_type = std::make_shared<GroupIdType>();
+
+inline const uint8_t* GetValuesAsBytes(const ArraySpan& data, int64_t offset =
0) {
+ DCHECK_GT(data.type->byte_width(), 0);
+ int64_t absolute_byte_offset = (data.offset + offset) *
data.type->byte_width();
+ return data.GetValues<uint8_t>(1, absolute_byte_offset);
+}
+
+template <typename Value>
+Status CheckForGetNextSegment(const std::vector<Value>& values, int64_t length,
+ int64_t offset, const std::vector<TypeHolder>&
key_types) {
+ if (offset < 0 || offset > length) {
+ return Status::Invalid("invalid grouping segmenter offset: ", offset);
+ }
+ if (values.size() != key_types.size()) {
+ return Status::Invalid("expected batch size ", key_types.size(), " but got
",
+ values.size());
+ }
+ for (size_t i = 0; i < key_types.size(); i++) {
+ const auto& value = values[i];
+ const auto& key_type = key_types[i];
+ if (*value.type() != *key_type.type) {
+ return Status::Invalid("expected batch value ", i, " of type ",
*key_type.type,
+ " but got ", *value.type());
+ }
+ }
+ return Status::OK();
+}
+
+template <typename Batch>
+enable_if_t<std::is_same<Batch, ExecSpan>::value || std::is_same<Batch,
ExecBatch>::value,
+ Status>
+CheckForGetNextSegment(const Batch& batch, int64_t offset,
+ const std::vector<TypeHolder>& key_types) {
+ return CheckForGetNextSegment(batch.values, batch.length, offset, key_types);
+}
+
+struct BaseGroupingSegmenter : public GroupingSegmenter {
+ explicit BaseGroupingSegmenter(const std::vector<TypeHolder>& key_types)
+ : key_types_(key_types) {}
+
+ const std::vector<TypeHolder>& key_types() const override { return
key_types_; }
+
+ std::vector<TypeHolder> key_types_;
+};
+
+GroupingSegment MakeSegment(int64_t batch_length, int64_t offset, int64_t
length,
+ bool extends) {
+ return GroupingSegment{offset, length, offset + length >= batch_length,
extends};
+}
+
+int64_t GetMatchLength(const uint8_t* match_bytes, int64_t match_width,
+ const uint8_t* array_bytes, int64_t offset, int64_t
length) {
+ int64_t cursor, byte_cursor;
+ for (cursor = offset, byte_cursor = match_width * cursor; cursor < length;
+ cursor++, byte_cursor += match_width) {
+ if (memcmp(match_bytes, array_bytes + byte_cursor,
+ static_cast<size_t>(match_width)) != 0) {
+ break;
+ }
+ }
+ return std::min(cursor, length - offset);
+}
+
+using ExtendFunc = std::function<bool(const void*)>;
+constexpr bool kDefaultExtends = true;
+constexpr bool kEmptyExtends = true;
+
+struct NoKeysGroupingSegmenter : public BaseGroupingSegmenter {
+ static std::unique_ptr<GroupingSegmenter> Make() {
+ return std::make_unique<NoKeysGroupingSegmenter>();
+ }
+
+ NoKeysGroupingSegmenter() : BaseGroupingSegmenter({}) {}
+
+ Status Reset() override { return Status::OK(); }
+
+ Result<GroupingSegment> GetNextSegment(const ExecSpan& batch, int64_t
offset) override {
+ ARROW_RETURN_NOT_OK(CheckForGetNextSegment(batch, offset, {}));
+ return MakeSegment(batch.length, offset, batch.length - offset,
kDefaultExtends);
+ }
+};
+
+struct SimpleKeyGroupingSegmenter : public BaseGroupingSegmenter {
Review Comment:
Why do we need NoKey/SimpleKey/AnyKeys segmenter instead of just using one?
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