Reranko05 commented on code in PR #51038:
URL: https://github.com/apache/arrow/pull/51038#discussion_r4072014551
##########
cpp/src/arrow/json/parser.cc:
##########
@@ -762,150 +743,276 @@ class HandlerBase : public BlockParser,
}
protected:
- template <typename Handler, typename Stream>
- Status DoParse(Handler& handler, Stream&& json, size_t json_size) {
- constexpr auto parse_flags = rj::kParseIterativeFlag |
rj::kParseNanAndInfFlag |
- rj::kParseStopWhenDoneFlag |
- rj::kParseNumbersAsStringsFlag;
-
- rj::Reader reader;
- // ensure that the loop can exit when the block too large.
- for (; num_rows_ < std::numeric_limits<int32_t>::max(); ++num_rows_) {
- auto ok = reader.Parse<parse_flags>(json, handler);
- switch (ok.Code()) {
- case rj::kParseErrorNone:
- // parse the next object
- continue;
- case rj::kParseErrorDocumentEmpty:
- if (json.Tell() < json_size) {
- return ParseError(rj::GetParseError_En(ok.Code()));
- }
- // parsed all objects, finish
- return Status::OK();
- case rj::kParseErrorTermination:
- // handler emitted an error
- return handler.Error();
- default:
- // rj emitted an error
- return ParseError(rj::GetParseError_En(ok.Code()), " in row ",
num_rows_);
+ Status DoParse(const std::shared_ptr<Buffer>& json) {
+ RETURN_NOT_OK(ReserveScalarStorage(json->size()));
+
+ const std::string_view input(reinterpret_cast<const char*>(json->data()),
+ json->size());
+
+ const int64_t input_size = input.size();
+ if (internal::ConsumeJsonWhitespace(input, /*trailing=*/false) ==
input_size) {
+ return Status::OK();
+ }
+
+ auto parse = [&](const auto& input) -> Status {
+ ARROW_ASSIGN_OR_RAISE(auto stream,
arrow::internal::ResolveSimdjsonResult(
+ parser_.iterate_many(input),
+ "Failed to create JSON document
stream"));
+
+ for (auto document_result : stream) {
+ ARROW_ASSIGN_OR_RAISE(
+ auto document,
+ arrow::internal::ResolveSimdjsonResult(
+ document_result, "Failed to iterate JSON document stream"));
+
+ if (num_rows_ == std::numeric_limits<int32_t>::max()) {
+ return Status::Invalid("Row count overflowed int32_t");
+ }
+
+ ARROW_ASSIGN_OR_RAISE(
+ auto value,
+ arrow::internal::ResolveSimdjsonResult(
+ document.get_value(), "JSON parse error: Failed to get JSON
value"));
+
+ RETURN_NOT_OK(ParseValue(value));
+
+ ++num_rows_;
+ }
+
+ if (stream.truncated_bytes() != 0) {
+ return ParseError("The document is empty");
}
+
+ return Status::OK();
+ };
+
+ if (json->capacity() - json->size() >=
+ static_cast<int64_t>(simdjson::SIMDJSON_PADDING)) {
+ const auto padded_json = simdjson::padded_string_view(
+ reinterpret_cast<const char*>(json->data()), json->size(),
json->capacity());
+ return parse(padded_json);
}
- return Status::Invalid("Row count overflowed int32_t");
- }
- template <typename Handler>
- Status DoParse(Handler& handler, const std::shared_ptr<Buffer>& json) {
- RETURN_NOT_OK(ReserveScalarStorage(json->size()));
- rj::MemoryStream ms(reinterpret_cast<const char*>(json->data()),
json->size());
- using InputStream = rj::EncodedInputStream<rj::UTF8<>, rj::MemoryStream>;
- return DoParse(handler, InputStream(ms),
static_cast<size_t>(json->size()));
+ simdjson::padded_string padded_json(reinterpret_cast<const
char*>(json->data()),
+ json->size());
+ return parse(padded_json);
}
- /// \defgroup handlerbase-append-methods append non-nested values
- ///
- /// @{
-
template <Kind::type kind>
- Status AppendScalar(BuilderPtr builder, std::string_view scalar) {
- if (ARROW_PREDICT_FALSE(builder.kind != kind)) {
- return IllegallyChangedTo(kind);
+ Status MaybePromoteFromNull() {
+ if (builder_.kind != Kind::kNull) {
+ return Status::OK();
}
- auto index = static_cast<int32_t>(scalar_values_builder_.length());
- auto value_length = static_cast<int32_t>(scalar.size());
- RETURN_NOT_OK(Cast<kind>(builder)->Append(index, value_length));
- RETURN_NOT_OK(scalar_values_builder_.Reserve(1));
- scalar_values_builder_.UnsafeAppend(scalar);
+
+ auto parent = builder_stack_.back();
+
+ if (parent.kind == Kind::kArray) {
+ auto list_builder = Cast<Kind::kArray>(parent);
+ DCHECK_EQ(list_builder->value_builder(), builder_);
+
+ RETURN_NOT_OK(builder_set_.MakeBuilder<kind>(builder_.index, &builder_));
+
+ list_builder = Cast<Kind::kArray>(parent);
+ list_builder->value_builder(builder_);
+ } else {
+ auto struct_builder = Cast<Kind::kObject>(parent);
+ DCHECK_EQ(struct_builder->field_builder(field_index_), builder_);
+
+ RETURN_NOT_OK(builder_set_.MakeBuilder<kind>(builder_.index, &builder_));
+
+ struct_builder = Cast<Kind::kObject>(parent);
+ struct_builder->field_builder(field_index_, builder_);
+ }
+
return Status::OK();
}
- /// @}
+ Status ParseValue(sj::value value) {
+ ARROW_ASSIGN_OR_RAISE(auto type, arrow::internal::ResolveSimdjsonResult(
+ value.type(), "Failed to determine
JSON type"));
- Status StartObjectImpl() {
+ switch (type) {
+ case sj::json_type::null: {
+ ARROW_ASSIGN_OR_RAISE([[maybe_unused]] auto is_null,
+ arrow::internal::ResolveSimdjsonResult(
+ value.is_null(), "Failed to validate JSON
null"));
+ return Null();
+ }
+
+ case sj::json_type::boolean: {
+ RETURN_NOT_OK(MaybePromoteFromNull<Kind::kBoolean>());
+
+ ARROW_ASSIGN_OR_RAISE(auto boolean,
+ arrow::internal::ResolveSimdjsonResult(
+ value.get_bool(), "Failed to get JSON
boolean"));
+ return Bool(boolean);
+ }
+
+ case sj::json_type::string: {
+ RETURN_NOT_OK(MaybePromoteFromNull<Kind::kString>());
+
+ ARROW_ASSIGN_OR_RAISE(auto string,
+ arrow::internal::ResolveSimdjsonResult(
+ value.get_string(), "Failed to get JSON
string"));
+ return String(string);
+ }
+
+ case sj::json_type::number: {
+ RETURN_NOT_OK(MaybePromoteFromNull<Kind::kNumber>());
+ auto raw_number = value.raw_json_token();
+ RETURN_NOT_OK(arrow::internal::ResolveSimdjsonResult(
+ value.get_number(), "Failed to parse JSON number"));
+ raw_number.remove_suffix(
+ internal::ConsumeJsonWhitespace(raw_number, /*trailing=*/true));
+ return RawNumber(raw_number);
+ }
+
+ case sj::json_type::array:
+ RETURN_NOT_OK(MaybePromoteFromNull<Kind::kArray>());
+ return ParseArray(value);
+
+ case sj::json_type::object:
+ RETURN_NOT_OK(MaybePromoteFromNull<Kind::kObject>());
+ return ParseObject(value);
+
+ default:
+ return ParseError("Invalid value");
+ }
+ }
+
+ Status ParseArray(sj::value value) {
+ constexpr auto kind = Kind::kArray;
+ if (ARROW_PREDICT_FALSE(builder_.kind != kind)) {
+ return IllegallyChangedTo(kind);
+ }
+
+ StartNested();
+
+ builder_ = Cast<kind>(builder_)->value_builder();
+
+ ARROW_ASSIGN_OR_RAISE(auto array, arrow::internal::ResolveSimdjsonResult(
+ value.get_array(), "Failed to get
JSON array"));
+
+ size_t size = 0;
+
+ for (auto element_result : array) {
+ ARROW_ASSIGN_OR_RAISE(auto element,
+ arrow::internal::ResolveSimdjsonResult(
+ element_result, "Failed to iterate JSON
array"));
+
+ RETURN_NOT_OK(ParseValue(element));
+ ++size;
+ }
+
+ EndNested();
+
+ auto list_builder = Cast<Kind::kArray>(builder_);
+ DCHECK_LE(size, std::numeric_limits<int32_t>::max());
+ return list_builder->Append(static_cast<int32_t>(size));
+ }
+
+ Status ParseObject(sj::value value) {
constexpr auto kind = Kind::kObject;
if (ARROW_PREDICT_FALSE(builder_.kind != kind)) {
return IllegallyChangedTo(kind);
}
+
auto struct_builder = Cast<kind>(builder_);
absent_fields_stack_.Push(struct_builder->num_fields(), true);
StartNested();
- return struct_builder->Append();
- }
+ RETURN_NOT_OK(struct_builder->Append());
- /// \brief helper for Key() functions
- ///
- /// sets the field builder with name key, or returns false if
- /// there is no field with that name
- bool SetFieldBuilder(std::string_view key, bool* duplicate_keys) {
- auto parent = Cast<Kind::kObject>(builder_stack_.back());
- field_index_ = parent->GetFieldIndex(key);
- if (ARROW_PREDICT_FALSE(field_index_ == -1)) {
- return false;
- }
- if (field_index_ < absent_fields_stack_.TopSize()) {
- *duplicate_keys = !absent_fields_stack_[field_index_];
- } else {
- // When field_index is beyond the range of absent_fields_stack_ we have
a duplicated
- // field that wasn't declared in schema or previous records.
- *duplicate_keys = true;
- }
- if (*duplicate_keys) {
- status_ = ParseError("Column(", Path(), ") was specified twice in row ",
num_rows_);
- return false;
+ ARROW_ASSIGN_OR_RAISE(
+ auto object, arrow::internal::ResolveSimdjsonResult(value.get_object(),
+ "Failed to get
JSON object"));
+
+ for (auto field_result : object) {
+ ARROW_ASSIGN_OR_RAISE(
+ auto field,
+ arrow::internal::ResolveSimdjsonResult(
+ field_result, "JSON parse error: Failed to iterate JSON
object"));
+
+ ARROW_ASSIGN_OR_RAISE(auto key,
+ arrow::internal::ResolveSimdjsonResult(
+ field.unescaped_key(), "Failed to get JSON
object key"));
+
+ RETURN_NOT_OK(ParseObjectField(key, field.value()));
}
- builder_ = parent->field_builder(field_index_);
- absent_fields_stack_[field_index_] = false;
- return true;
- }
- Status EndObjectImpl() {
auto parent = builder_stack_.back();
-
auto expected_count = absent_fields_stack_.TopSize();
+
for (int i = 0; i < expected_count; ++i) {
if (!absent_fields_stack_[i]) {
continue;
}
+
auto field_builder = Cast<Kind::kObject>(parent)->field_builder(i);
if (ARROW_PREDICT_FALSE(!field_builder.nullable)) {
return ParseError("a required field was absent");
}
+
RETURN_NOT_OK(builder_set_.AppendNull(parent, i, field_builder));
}
+
absent_fields_stack_.Pop();
EndNested();
return Status::OK();
}
- Status StartArrayImpl() {
- constexpr auto kind = Kind::kArray;
- if (ARROW_PREDICT_FALSE(builder_.kind != kind)) {
+ Status ParseObjectField(std::string_view key, sj::value value) {
+ bool duplicate_keys = false;
+
+ if (SetFieldBuilder(key, &duplicate_keys)) {
+ return ParseValue(value);
+ }
+
+ if (duplicate_keys) {
+ return status_;
+ }
+
+ return HandleUnexpectedField(key, value);
+ }
+
+ template <Kind::type kind>
+ Status AppendScalar(BuilderPtr builder, std::string_view scalar) {
+ if (ARROW_PREDICT_FALSE(builder.kind != kind)) {
return IllegallyChangedTo(kind);
}
- StartNested();
- // append to the list builder in EndArrayImpl
- builder_ = Cast<kind>(builder_)->value_builder();
+ auto index = static_cast<int32_t>(scalar_values_builder_.length());
+ auto value_length = static_cast<int32_t>(scalar.size());
+ RETURN_NOT_OK(Cast<kind>(builder)->Append(index, value_length));
+ RETURN_NOT_OK(scalar_values_builder_.Reserve(1));
+ scalar_values_builder_.UnsafeAppend(scalar);
return Status::OK();
}
- Status EndArrayImpl(rj::SizeType size) {
- EndNested();
- // append to list_builder here
- auto list_builder = Cast<Kind::kArray>(builder_);
- return list_builder->Append(size);
+ bool SetFieldBuilder(std::string_view key, bool* duplicate_keys) {
+ auto parent = Cast<Kind::kObject>(builder_stack_.back());
+ field_index_ = parent->GetFieldIndex(key);
+ if (ARROW_PREDICT_FALSE(field_index_ == -1)) {
+ return false;
+ }
+ if (field_index_ < absent_fields_stack_.TopSize()) {
+ *duplicate_keys = !absent_fields_stack_[field_index_];
+ } else {
+ *duplicate_keys = true;
Review Comment:
Restored it.
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