rtpsw commented on code in PR #14352:
URL: https://github.com/apache/arrow/pull/14352#discussion_r1019993735
##########
cpp/src/arrow/compute/row/grouper.cc:
##########
@@ -44,7 +45,406 @@ namespace compute {
namespace {
-struct GrouperImpl : Grouper {
+inline const uint8_t* GetValuesAsBytes(const ArrayData& data, int64_t offset =
0) {
+ int64_t absolute_byte_offset = (data.offset + offset) *
data.type->byte_width();
+ return data.GetValues<uint8_t>(1, absolute_byte_offset);
+}
+
+inline const uint8_t* GetValuesAsBytes(const ArraySpan& data, int64_t offset =
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();
+}
+
+Status CheckForGetNextSegment(const ExecSpan& batch, int64_t offset,
+ const std::vector<TypeHolder>& key_types) {
+ return CheckForGetNextSegment(batch.values, batch.length, offset, key_types);
+}
+
+Status CheckForGetNextSegment(const ExecBatch& batch, int64_t offset,
+ const std::vector<TypeHolder>& key_types) {
+ return CheckForGetNextSegment(batch.values, batch.length, offset, key_types);
+}
+
+struct StatelessGroupingSegmenter : public GroupingSegmenter {
+ Status Reset() override { return Status::OK(); }
+};
+
+GroupingSegment MakeSegment(int64_t batch_length, int64_t offset, int64_t
length) {
+ return GroupingSegment{offset, length, offset + length >= batch_length};
+}
+
+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);
+}
+
+Result<GroupingSegment> GetNextSegmentChunked(
+ const std::shared_ptr<ChunkedArray>& chunked_array, int64_t offset) {
+ if (offset >= chunked_array->length()) {
+ return MakeSegment(chunked_array->length(), chunked_array->length(), 0);
+ }
+ int64_t remaining_offset = offset;
+ const auto& arrays = chunked_array->chunks();
+ for (size_t i = 0; remaining_offset >= 0 && i < arrays.size(); i++) {
+ // look up chunk containing offset
+ int64_t array_length = arrays[i]->length();
+ if (remaining_offset < array_length) {
+ // found - switch to matching
+ int64_t match_width = arrays[i]->type()->byte_width();
+ const uint8_t* match_bytes = GetValuesAsBytes(*arrays[i]->data(),
remaining_offset);
+ int64_t total_match_length = 0;
+ for (; i < arrays.size(); i++) {
+ int64_t array_length = arrays[i]->length();
+ if (array_length <= 0) continue;
+ const uint8_t* array_bytes = GetValuesAsBytes(*arrays[i]->data());
+ int64_t match_length = GetMatchLength(match_bytes, match_width,
array_bytes,
+ remaining_offset, array_length);
+ total_match_length += match_length;
+ remaining_offset = 0;
+ if (match_length < array_length - remaining_offset) break;
+ }
+ return MakeSegment(chunked_array->length(), offset, total_match_length);
+ }
+ remaining_offset -= array_length;
+ }
+ return Status::Invalid("segmenting invalid chunked array value");
+}
+
+struct NoKeysGroupingSegmenter : public StatelessGroupingSegmenter {
+ static Result<std::unique_ptr<GroupingSegmenter>> Make() {
+ return std::make_unique<NoKeysGroupingSegmenter>();
+ }
+
+ template <typename Batch>
+ Result<GroupingSegment> GetNextSegmentImpl(const Batch& batch, int64_t
offset) {
+ ARROW_RETURN_NOT_OK(CheckForGetNextSegment(batch, offset, {}));
+ return MakeSegment(batch.length, offset, batch.length - offset);
+ }
+
+ Result<GroupingSegment> GetNextSegment(const ExecSpan& batch, int64_t
offset) override {
+ return GetNextSegmentImpl(batch, offset);
+ }
+
+ Result<GroupingSegment> GetNextSegment(const ExecBatch& batch,
+ int64_t offset) override {
+ return GetNextSegmentImpl(batch, offset);
+ }
+};
+
+struct SimpleKeyGroupingSegmenter : public StatelessGroupingSegmenter {
+ static Result<std::unique_ptr<GroupingSegmenter>> Make(
+ std::vector<TypeHolder> key_types) {
+ return std::make_unique<SimpleKeyGroupingSegmenter>(key_types);
+ }
+
+ explicit SimpleKeyGroupingSegmenter(std::vector<TypeHolder> key_types)
+ : key_types_(std::move(key_types)) {}
+
+ Status CheckType(const DataType& type) {
+ if (!is_fixed_width(type)) {
+ return Status::Invalid("SimpleKeyGroupingSegmenter does not support type
", type);
+ }
+ return Status::OK();
+ }
+
+ Result<GroupingSegment> GetNextSegment(const Scalar& scalar, int64_t offset,
+ int64_t length) {
+ ARROW_RETURN_NOT_OK(CheckType(*scalar.type));
+ if (!scalar.is_valid) {
+ return Status::Invalid("segmenting an invalid scalar");
+ }
+ return MakeSegment(length, 0, length);
+ }
+
+ Result<GroupingSegment> GetNextSegment(const DataType& array_type,
+ const uint8_t* array_bytes, int64_t
offset,
+ int64_t length) {
+ RETURN_NOT_OK(CheckType(array_type));
+ int64_t byte_width = array_type.byte_width();
+ int64_t match_length = GetMatchLength(array_bytes + offset * byte_width,
byte_width,
+ array_bytes, offset, length);
+ return MakeSegment(length, offset, match_length);
+ }
+
+ Result<GroupingSegment> GetNextSegment(const ExecSpan& batch, int64_t
offset) override {
+ ARROW_RETURN_NOT_OK(CheckForGetNextSegment(batch, offset, key_types_));
+ const auto& value = batch.values[0];
+ if (value.is_scalar()) {
+ return GetNextSegment(*value.scalar, offset, batch.length);
+ }
+ ARROW_DCHECK(value.is_array());
+ const auto& array = value.array;
+ if (array.GetNullCount() > 0) {
+ return Status::NotImplemented("segmenting a nullable array");
+ }
+ return GetNextSegment(*array.type, GetValuesAsBytes(array), offset,
batch.length);
+ }
+
+ Result<GroupingSegment> GetNextSegment(const ExecBatch& batch,
+ int64_t offset) override {
+ ARROW_RETURN_NOT_OK(CheckForGetNextSegment(batch, offset, key_types_));
+ const auto& value = batch.values[0];
+ if (value.is_scalar()) {
+ return GetNextSegment(*value.scalar(), offset, batch.length);
+ }
+ if (value.is_array()) {
+ auto array = value.array();
+ if (array->GetNullCount() > 0) {
+ return Status::NotImplemented("segmenting a nullable array");
+ }
+ return GetNextSegment(*array->type, GetValuesAsBytes(*array), offset,
batch.length);
+ }
+ if (value.is_chunked_array()) {
+ auto array = value.chunked_array();
+ if (array->null_count() > 0) {
+ return Status::NotImplemented("segmenting a nullable array");
+ }
+ return GetNextSegmentChunked(array, offset);
+ }
+ return Status::Invalid("segmenting unsupported value kind ", value.kind());
+ }
+
+ private:
+ const std::vector<TypeHolder> key_types_;
+};
+
+struct AnyKeysGroupingSegmenter : public StatelessGroupingSegmenter {
+ static Result<std::unique_ptr<GroupingSegmenter>> Make(
+ std::vector<TypeHolder> key_types, ExecContext* ctx) {
+ ARROW_RETURN_NOT_OK(Grouper::Make(key_types, ctx)); // check types
+ return std::make_unique<AnyKeysGroupingSegmenter>(key_types, ctx);
+ }
+
+ AnyKeysGroupingSegmenter(std::vector<TypeHolder> key_types, ExecContext* ctx)
+ : key_types_(std::move(key_types)), ctx_(ctx) {}
+
+ template <typename Batch>
+ Result<GroupingSegment> GetNextSegmentImpl(const Batch& batch, int64_t
offset) {
+ ARROW_RETURN_NOT_OK(CheckForGetNextSegment(batch, offset, key_types_));
+ // TODO: make Grouper support Reset(), so it can be cached instead of
recreated here
Review Comment:
https://issues.apache.org/jira/browse/ARROW-18311
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