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GH-42971: [C++] Parquet stream writer: Allow writing BYTE_ARRAY with converted type NONE #44739

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Merged
pitrou merged 1 commit into from
Jul 8, 2025
Merged

GH-42971: [C++] Parquet stream writer: Allow writing BYTE_ARRAY with converted type NONE #44739

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16 changes: 11 additions & 5 deletions cpp/src/parquet/stream_writer.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -129,20 +129,26 @@ StreamWriter& StreamWriter::operator<<(FixedStringView v) {
}

StreamWriter& StreamWriter::operator<<(const char* v) {
return WriteVariableLength(v, std::strlen(v));
return WriteVariableLength(v, std::strlen(v), ConvertedType::UTF8);
}

StreamWriter& StreamWriter::operator<<(const std::string& v) {
return WriteVariableLength(v.data(), v.size());
return WriteVariableLength(v.data(), v.size(), ConvertedType::UTF8);
}

StreamWriter& StreamWriter::operator<<(::std::string_view v) {
return WriteVariableLength(v.data(), v.size());
return WriteVariableLength(v.data(), v.size(), ConvertedType::UTF8);
}

StreamWriter& StreamWriter::operator<<(RawDataView v) {
return WriteVariableLength(reinterpret_cast<const char*>(v.data()), v.size(),
ConvertedType::NONE);
}

StreamWriter& StreamWriter::WriteVariableLength(const char* data_ptr,
std::size_t data_len) {
CheckColumn(Type::BYTE_ARRAY, ConvertedType::UTF8);
std::size_t data_len,
ConvertedType::type type) {
CheckColumn(Type::BYTE_ARRAY, type);

auto writer = static_cast<ByteArrayWriter*>(row_group_writer_->column(column_index_++));

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11 changes: 10 additions & 1 deletion cpp/src/parquet/stream_writer.h
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Expand Up @@ -26,6 +26,8 @@
#include <string_view>
#include <vector>

#include "arrow/util/span.h"

#include "parquet/column_writer.h"
#include "parquet/file_writer.h"

Expand Down Expand Up @@ -151,6 +153,12 @@ class PARQUET_EXPORT StreamWriter {
StreamWriter& operator<<(const std::string& v);
StreamWriter& operator<<(::std::string_view v);

/// \brief Helper class to write variable length raw data.
using RawDataView = ::arrow::util::span<const uint8_t>;

/// \brief Output operators for variable length raw data.
StreamWriter& operator<<(RawDataView v);

/// \brief Output operator for optional fields.
template <typename T>
StreamWriter& operator<<(const optional<T>& v) {
Expand Down Expand Up @@ -190,7 +198,8 @@ class PARQUET_EXPORT StreamWriter {
return *this;
}

StreamWriter& WriteVariableLength(const char* data_ptr, std::size_t data_len);
StreamWriter& WriteVariableLength(const char* data_ptr, std::size_t data_len,
ConvertedType::type converted_type);

StreamWriter& WriteFixedLength(const char* data_ptr, std::size_t data_len);

Expand Down
32 changes: 29 additions & 3 deletions cpp/src/parquet/stream_writer_test.cc
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Expand Up @@ -80,6 +80,9 @@ class TestStreamWriter : public ::testing::Test {
fields.push_back(schema::PrimitiveNode::Make("double_field", Repetition::REQUIRED,
Type::DOUBLE, ConvertedType::NONE));

fields.push_back(schema::PrimitiveNode::Make("bytes_field", Repetition::REQUIRED,
Type::BYTE_ARRAY, ConvertedType::NONE));

return std::static_pointer_cast<schema::GroupNode>(
schema::GroupNode::Make("schema", Repetition::REQUIRED, fields));
}
Expand All @@ -99,7 +102,7 @@ TEST_F(TestStreamWriter, DefaultConstructed) {
EXPECT_EQ(0, os.current_column());
EXPECT_EQ(0, os.current_row());
EXPECT_EQ(0, os.num_columns());
EXPECT_EQ(0, os.SkipColumns(10));
EXPECT_EQ(0, os.SkipColumns(11));
}

TEST_F(TestStreamWriter, TypeChecking) {
Expand Down Expand Up @@ -162,6 +165,17 @@ TEST_F(TestStreamWriter, TypeChecking) {
EXPECT_THROW(writer_ << 5.4f, ParquetException);
EXPECT_NO_THROW(writer_ << 5.4);

// Required type: Variable length byte array.
// Strings and naked char* are rejected because they should use UTF8 instead of None
// type.
EXPECT_EQ(10, writer_.current_column());
EXPECT_THROW(writer_ << 5, ParquetException);
EXPECT_THROW(writer_ << char3_array, ParquetException);
EXPECT_THROW(writer_ << char4_array, ParquetException);
EXPECT_THROW(writer_ << char5_array, ParquetException);
EXPECT_THROW(writer_ << std::string("not ok"), ParquetException);
EXPECT_NO_THROW(writer_ << StreamWriter::RawDataView((uint8_t*)"\xff\0ok", 4));

EXPECT_EQ(0, writer_.current_row());
EXPECT_NO_THROW(writer_ << EndRow);
EXPECT_EQ(1, writer_.current_row());
Expand Down Expand Up @@ -210,6 +224,11 @@ TEST_F(TestStreamWriter, RequiredFieldChecking) {
EXPECT_THROW(writer_ << optional<double>(), ParquetException);
EXPECT_NO_THROW(writer_ << optional<double>(5.4));

// Required field of type: Variable length byte array.
EXPECT_THROW(writer_ << optional<StreamWriter::RawDataView>(), ParquetException);
EXPECT_NO_THROW(
writer_ << std::make_optional<StreamWriter::RawDataView>((uint8_t*)"ok", 2));

EXPECT_NO_THROW(writer_ << EndRow);
}

Expand All @@ -234,6 +253,7 @@ TEST_F(TestStreamWriter, EndRow) {
EXPECT_NO_THROW(writer_ << uint64_t((1ull << 60) + 123));
EXPECT_NO_THROW(writer_ << 25.4f);
EXPECT_NO_THROW(writer_ << 3.3424);
EXPECT_NO_THROW(writer_ << StreamWriter::RawDataView((uint8_t*)"ok", 2));
// Correct use of end row after all fields have been output.
EXPECT_NO_THROW(writer_ << EndRow);
EXPECT_EQ(1, writer_.current_row());
Expand Down Expand Up @@ -272,6 +292,10 @@ TEST_F(TestStreamWriter, EndRowGroup) {
EXPECT_NO_THROW(writer_ << uint64_t((1ull << 60) - i * i)) << "index: " << i;
EXPECT_NO_THROW(writer_ << 42325.4f / float(i + 1)) << "index: " << i;
EXPECT_NO_THROW(writer_ << 3.2342e5 / double(i + 1)) << "index: " << i;
std::string tmpString = std::to_string(i);
EXPECT_NO_THROW(writer_ << StreamWriter::RawDataView((uint8_t*)tmpString.c_str(),
tmpString.length()))
<< "index: " << i;
EXPECT_NO_THROW(writer_ << EndRow) << "index: " << i;

if (i % 1000 == 0) {
Expand All @@ -293,7 +317,8 @@ TEST_F(TestStreamWriter, SkipColumns) {
writer_ << true << std::string("Cannot skip mandatory columns");
EXPECT_THROW(writer_.SkipColumns(1), ParquetException);
writer_ << 'x' << std::array<char, 4>{'A', 'B', 'C', 'D'} << int8_t(2) << uint16_t(3)
<< int32_t(4) << uint64_t(5) << 6.0f << 7.0;
<< int32_t(4) << uint64_t(5) << 6.0f << 7.0
<< StreamWriter::RawDataView((uint8_t*)"ok", 2);
writer_ << EndRow;
}

Expand All @@ -304,7 +329,8 @@ TEST_F(TestStreamWriter, AppendNotImplemented) {
writer_ = StreamWriter{ParquetFileWriter::Open(outfile, GetSchema())};
writer_ << false << std::string("Just one row") << 'x'
<< std::array<char, 4>{'A', 'B', 'C', 'D'} << int8_t(2) << uint16_t(3)
<< int32_t(4) << uint64_t(5) << 6.0f << 7.0;
<< int32_t(4) << uint64_t(5) << 6.0f << 7.0
<< StreamWriter::RawDataView((uint8_t*)"ok", 2);
writer_ << EndRow;
writer_ = StreamWriter{};

Expand Down
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