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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-21 11:54:28 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-21 11:54:28 +0000
commite6918187568dbd01842d8d1d2c808ce16a894239 (patch)
tree64f88b554b444a49f656b6c656111a145cbbaa28 /src/arrow/cpp/examples
parentInitial commit. (diff)
downloadceph-e6918187568dbd01842d8d1d2c808ce16a894239.tar.xz
ceph-e6918187568dbd01842d8d1d2c808ce16a894239.zip
Adding upstream version 18.2.2.upstream/18.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/arrow/cpp/examples')
-rw-r--r--src/arrow/cpp/examples/arrow/CMakeLists.txt44
-rw-r--r--src/arrow/cpp/examples/arrow/compute_and_write_csv_example.cc113
-rw-r--r--src/arrow/cpp/examples/arrow/compute_register_example.cc168
-rw-r--r--src/arrow/cpp/examples/arrow/dataset_documentation_example.cc374
-rw-r--r--src/arrow/cpp/examples/arrow/dataset_parquet_scan_example.cc190
-rw-r--r--src/arrow/cpp/examples/arrow/row_wise_conversion_example.cc207
-rw-r--r--src/arrow/cpp/examples/minimal_build/.gitignore18
-rw-r--r--src/arrow/cpp/examples/minimal_build/CMakeLists.txt40
-rw-r--r--src/arrow/cpp/examples/minimal_build/README.md88
-rwxr-xr-xsrc/arrow/cpp/examples/minimal_build/build_arrow.sh35
-rwxr-xr-xsrc/arrow/cpp/examples/minimal_build/build_example.sh27
-rw-r--r--src/arrow/cpp/examples/minimal_build/docker-compose.yml51
-rw-r--r--src/arrow/cpp/examples/minimal_build/example.cc69
-rw-r--r--src/arrow/cpp/examples/minimal_build/minimal.dockerfile27
-rwxr-xr-xsrc/arrow/cpp/examples/minimal_build/run.sh48
-rw-r--r--src/arrow/cpp/examples/minimal_build/run_static.bat88
-rwxr-xr-xsrc/arrow/cpp/examples/minimal_build/run_static.sh121
-rw-r--r--src/arrow/cpp/examples/minimal_build/system_dependency.dockerfile44
-rw-r--r--src/arrow/cpp/examples/minimal_build/test.csv3
-rw-r--r--src/arrow/cpp/examples/parquet/CMakeLists.txt78
-rw-r--r--src/arrow/cpp/examples/parquet/low_level_api/encryption_reader_writer.cc451
-rw-r--r--src/arrow/cpp/examples/parquet/low_level_api/encryption_reader_writer_all_crypto_options.cc656
-rw-r--r--src/arrow/cpp/examples/parquet/low_level_api/reader_writer.cc413
-rw-r--r--src/arrow/cpp/examples/parquet/low_level_api/reader_writer.h70
-rw-r--r--src/arrow/cpp/examples/parquet/low_level_api/reader_writer2.cc434
-rw-r--r--src/arrow/cpp/examples/parquet/parquet_arrow/CMakeLists.txt42
-rw-r--r--src/arrow/cpp/examples/parquet/parquet_arrow/README.md20
-rw-r--r--src/arrow/cpp/examples/parquet/parquet_arrow/reader_writer.cc140
-rw-r--r--src/arrow/cpp/examples/parquet/parquet_stream_api/stream_reader_writer.cc324
29 files changed, 4383 insertions, 0 deletions
diff --git a/src/arrow/cpp/examples/arrow/CMakeLists.txt b/src/arrow/cpp/examples/arrow/CMakeLists.txt
new file mode 100644
index 000000000..ac758b92d
--- /dev/null
+++ b/src/arrow/cpp/examples/arrow/CMakeLists.txt
@@ -0,0 +1,44 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+ADD_ARROW_EXAMPLE(row_wise_conversion_example)
+
+if (ARROW_COMPUTE)
+ ADD_ARROW_EXAMPLE(compute_register_example)
+endif()
+
+if (ARROW_COMPUTE AND ARROW_CSV)
+ ADD_ARROW_EXAMPLE(compute_and_write_csv_example)
+endif()
+
+if (ARROW_PARQUET AND ARROW_DATASET)
+ if (ARROW_BUILD_SHARED)
+ set(DATASET_EXAMPLES_LINK_LIBS arrow_dataset_shared)
+ else()
+ set(DATASET_EXAMPLES_LINK_LIBS arrow_dataset_static)
+ endif()
+
+ ADD_ARROW_EXAMPLE(dataset_parquet_scan_example
+ EXTRA_LINK_LIBS
+ ${DATASET_EXAMPLES_LINK_LIBS})
+ add_dependencies(dataset_parquet_scan_example parquet)
+
+ ADD_ARROW_EXAMPLE(dataset_documentation_example
+ EXTRA_LINK_LIBS
+ ${DATASET_EXAMPLES_LINK_LIBS})
+ add_dependencies(dataset_documentation_example parquet)
+endif()
diff --git a/src/arrow/cpp/examples/arrow/compute_and_write_csv_example.cc b/src/arrow/cpp/examples/arrow/compute_and_write_csv_example.cc
new file mode 100644
index 000000000..db3478759
--- /dev/null
+++ b/src/arrow/cpp/examples/arrow/compute_and_write_csv_example.cc
@@ -0,0 +1,113 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#include <arrow/api.h>
+#include <arrow/compute/api_aggregate.h>
+#include <arrow/csv/api.h>
+#include <arrow/csv/writer.h>
+#include <arrow/io/api.h>
+#include <arrow/result.h>
+#include <arrow/status.h>
+
+#include <iostream>
+#include <vector>
+
+// Many operations in Apache Arrow operate on
+// columns of data, and the columns of data are
+// assembled into a table. In this example, we
+// examine how to compare two arrays which are
+// combined to form a table that is then written
+// out to a CSV file.
+//
+// To run this example you can use
+// ./compute_and_write_csv_example
+//
+// the program will write the files into
+// compute_and_write_output.csv
+// in the current directory
+
+arrow::Status RunMain(int argc, char** argv) {
+ // Make Arrays
+ arrow::NumericBuilder<arrow::Int64Type> int64_builder;
+ arrow::BooleanBuilder boolean_builder;
+
+ // Make place for 8 values in total
+ ARROW_RETURN_NOT_OK(int64_builder.Resize(8));
+ ARROW_RETURN_NOT_OK(boolean_builder.Resize(8));
+
+ // Bulk append the given values
+ std::vector<int64_t> int64_values = {1, 2, 3, 4, 5, 6, 7, 8};
+ ARROW_RETURN_NOT_OK(int64_builder.AppendValues(int64_values));
+ std::shared_ptr<arrow::Array> array_a;
+ ARROW_RETURN_NOT_OK(int64_builder.Finish(&array_a));
+ int64_builder.Reset();
+ int64_values = {2, 5, 1, 3, 6, 2, 7, 4};
+ std::shared_ptr<arrow::Array> array_b;
+ ARROW_RETURN_NOT_OK(int64_builder.AppendValues(int64_values));
+ ARROW_RETURN_NOT_OK(int64_builder.Finish(&array_b));
+
+ // Cast the arrays to their actual types
+ auto int64_array_a = std::static_pointer_cast<arrow::Int64Array>(array_a);
+ auto int64_array_b = std::static_pointer_cast<arrow::Int64Array>(array_b);
+ // Explicit comparison of values using a loop
+ for (int64_t i = 0; i < 8; i++) {
+ if ((!int64_array_a->IsNull(i)) && (!int64_array_b->IsNull(i))) {
+ bool comparison_result = int64_array_a->Value(i) > int64_array_b->Value(i);
+ boolean_builder.UnsafeAppend(comparison_result);
+ } else {
+ boolean_builder.UnsafeAppendNull();
+ }
+ }
+ std::shared_ptr<arrow::Array> array_a_gt_b_self;
+ ARROW_RETURN_NOT_OK(boolean_builder.Finish(&array_a_gt_b_self));
+ std::cout << "Array explicitly compared" << std::endl;
+
+ // Explicit comparison of values using a compute function
+ ARROW_ASSIGN_OR_RAISE(arrow::Datum compared_datum,
+ arrow::compute::CallFunction("greater", {array_a, array_b}));
+ auto array_a_gt_b_compute = compared_datum.make_array();
+ std::cout << "Arrays compared using a compute function" << std::endl;
+
+ // Create a table for the output
+ auto schema =
+ arrow::schema({arrow::field("a", arrow::int64()), arrow::field("b", arrow::int64()),
+ arrow::field("a>b? (self written)", arrow::boolean()),
+ arrow::field("a>b? (arrow)", arrow::boolean())});
+ std::shared_ptr<arrow::Table> my_table = arrow::Table::Make(
+ schema, {array_a, array_b, array_a_gt_b_self, array_a_gt_b_compute});
+
+ std::cout << "Table created" << std::endl;
+
+ // Write table to CSV file
+ auto csv_filename = "compute_and_write_output.csv";
+ ARROW_ASSIGN_OR_RAISE(auto outstream, arrow::io::FileOutputStream::Open(csv_filename));
+
+ std::cout << "Writing CSV file" << std::endl;
+ ARROW_RETURN_NOT_OK(arrow::csv::WriteCSV(
+ *my_table, arrow::csv::WriteOptions::Defaults(), outstream.get()));
+
+ return arrow::Status::OK();
+}
+
+int main(int argc, char** argv) {
+ arrow::Status status = RunMain(argc, argv);
+ if (!status.ok()) {
+ std::cerr << status << std::endl;
+ return EXIT_FAILURE;
+ }
+ return EXIT_SUCCESS;
+}
diff --git a/src/arrow/cpp/examples/arrow/compute_register_example.cc b/src/arrow/cpp/examples/arrow/compute_register_example.cc
new file mode 100644
index 000000000..dd760bb60
--- /dev/null
+++ b/src/arrow/cpp/examples/arrow/compute_register_example.cc
@@ -0,0 +1,168 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#include <arrow/api.h>
+#include <arrow/compute/api.h>
+#include <arrow/compute/exec/exec_plan.h>
+#include <arrow/compute/exec/expression.h>
+#include <arrow/compute/exec/options.h>
+#include <arrow/util/async_generator.h>
+#include <arrow/util/future.h>
+
+#include <cstdlib>
+#include <iostream>
+#include <memory>
+
+// Demonstrate registering an Arrow compute function outside of the Arrow source tree
+
+namespace cp = ::arrow::compute;
+
+#define ABORT_ON_FAILURE(expr) \
+ do { \
+ arrow::Status status_ = (expr); \
+ if (!status_.ok()) { \
+ std::cerr << status_.message() << std::endl; \
+ abort(); \
+ } \
+ } while (0);
+
+class ExampleFunctionOptionsType : public cp::FunctionOptionsType {
+ const char* type_name() const override { return "ExampleFunctionOptionsType"; }
+ std::string Stringify(const cp::FunctionOptions&) const override {
+ return "ExampleFunctionOptionsType";
+ }
+ bool Compare(const cp::FunctionOptions&, const cp::FunctionOptions&) const override {
+ return true;
+ }
+ std::unique_ptr<cp::FunctionOptions> Copy(const cp::FunctionOptions&) const override;
+ // optional: support for serialization
+ // Result<std::shared_ptr<Buffer>> Serialize(const FunctionOptions&) const override;
+ // Result<std::unique_ptr<FunctionOptions>> Deserialize(const Buffer&) const override;
+};
+
+cp::FunctionOptionsType* GetExampleFunctionOptionsType() {
+ static ExampleFunctionOptionsType options_type;
+ return &options_type;
+}
+
+class ExampleFunctionOptions : public cp::FunctionOptions {
+ public:
+ ExampleFunctionOptions() : cp::FunctionOptions(GetExampleFunctionOptionsType()) {}
+};
+
+std::unique_ptr<cp::FunctionOptions> ExampleFunctionOptionsType::Copy(
+ const cp::FunctionOptions&) const {
+ return std::unique_ptr<cp::FunctionOptions>(new ExampleFunctionOptions());
+}
+
+arrow::Status ExampleFunctionImpl(cp::KernelContext* ctx, const cp::ExecBatch& batch,
+ arrow::Datum* out) {
+ *out->mutable_array() = *batch[0].array();
+ return arrow::Status::OK();
+}
+
+class ExampleNodeOptions : public cp::ExecNodeOptions {};
+
+// a basic ExecNode which ignores all input batches
+class ExampleNode : public cp::ExecNode {
+ public:
+ ExampleNode(ExecNode* input, const ExampleNodeOptions&)
+ : ExecNode(/*plan=*/input->plan(), /*inputs=*/{input},
+ /*input_labels=*/{"ignored"},
+ /*output_schema=*/input->output_schema(), /*num_outputs=*/1) {}
+
+ const char* kind_name() const override { return "ExampleNode"; }
+
+ arrow::Status StartProducing() override {
+ outputs_[0]->InputFinished(this, 0);
+ return arrow::Status::OK();
+ }
+
+ void ResumeProducing(ExecNode* output) override {}
+ void PauseProducing(ExecNode* output) override {}
+
+ void StopProducing(ExecNode* output) override { inputs_[0]->StopProducing(this); }
+ void StopProducing() override { inputs_[0]->StopProducing(); }
+
+ void InputReceived(ExecNode* input, cp::ExecBatch batch) override {}
+ void ErrorReceived(ExecNode* input, arrow::Status error) override {}
+ void InputFinished(ExecNode* input, int total_batches) override {}
+
+ arrow::Future<> finished() override { return inputs_[0]->finished(); }
+};
+
+arrow::Result<cp::ExecNode*> ExampleExecNodeFactory(cp::ExecPlan* plan,
+ std::vector<cp::ExecNode*> inputs,
+ const cp::ExecNodeOptions& options) {
+ const auto& example_options =
+ arrow::internal::checked_cast<const ExampleNodeOptions&>(options);
+
+ return plan->EmplaceNode<ExampleNode>(inputs[0], example_options);
+}
+
+const cp::FunctionDoc func_doc{
+ "Example function to demonstrate registering an out-of-tree function",
+ "",
+ {"x"},
+ "ExampleFunctionOptions"};
+
+int main(int argc, char** argv) {
+ const std::string name = "compute_register_example";
+ auto func = std::make_shared<cp::ScalarFunction>(name, cp::Arity::Unary(), &func_doc);
+ ABORT_ON_FAILURE(func->AddKernel({cp::InputType::Array(arrow::int64())}, arrow::int64(),
+ ExampleFunctionImpl));
+
+ auto registry = cp::GetFunctionRegistry();
+ ABORT_ON_FAILURE(registry->AddFunction(std::move(func)));
+
+ arrow::Int64Builder builder(arrow::default_memory_pool());
+ std::shared_ptr<arrow::Array> arr;
+ ABORT_ON_FAILURE(builder.Append(42));
+ ABORT_ON_FAILURE(builder.Finish(&arr));
+ auto options = std::make_shared<ExampleFunctionOptions>();
+ auto maybe_result = cp::CallFunction(name, {arr}, options.get());
+ ABORT_ON_FAILURE(maybe_result.status());
+
+ std::cout << maybe_result->make_array()->ToString() << std::endl;
+
+ // Expression serialization will raise NotImplemented if an expression includes
+ // FunctionOptions for which serialization is not supported.
+ auto expr = cp::call(name, {}, options);
+ auto maybe_serialized = cp::Serialize(expr);
+ std::cerr << maybe_serialized.status().ToString() << std::endl;
+
+ auto exec_registry = cp::default_exec_factory_registry();
+ ABORT_ON_FAILURE(
+ exec_registry->AddFactory("compute_register_example", ExampleExecNodeFactory));
+
+ auto maybe_plan = cp::ExecPlan::Make();
+ ABORT_ON_FAILURE(maybe_plan.status());
+ auto plan = maybe_plan.ValueOrDie();
+
+ arrow::AsyncGenerator<arrow::util::optional<cp::ExecBatch>> source_gen, sink_gen;
+ ABORT_ON_FAILURE(
+ cp::Declaration::Sequence(
+ {
+ {"source", cp::SourceNodeOptions{arrow::schema({}), source_gen}},
+ {"compute_register_example", ExampleNodeOptions{}},
+ {"sink", cp::SinkNodeOptions{&sink_gen}},
+ })
+ .AddToPlan(plan.get())
+ .status());
+
+ return EXIT_SUCCESS;
+}
diff --git a/src/arrow/cpp/examples/arrow/dataset_documentation_example.cc b/src/arrow/cpp/examples/arrow/dataset_documentation_example.cc
new file mode 100644
index 000000000..1aac66d4a
--- /dev/null
+++ b/src/arrow/cpp/examples/arrow/dataset_documentation_example.cc
@@ -0,0 +1,374 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+// This example showcases various ways to work with Datasets. It's
+// intended to be paired with the documentation.
+
+#include <arrow/api.h>
+#include <arrow/compute/cast.h>
+#include <arrow/compute/exec/expression.h>
+#include <arrow/dataset/dataset.h>
+#include <arrow/dataset/discovery.h>
+#include <arrow/dataset/file_base.h>
+#include <arrow/dataset/file_ipc.h>
+#include <arrow/dataset/file_parquet.h>
+#include <arrow/dataset/scanner.h>
+#include <arrow/filesystem/filesystem.h>
+#include <arrow/ipc/writer.h>
+#include <arrow/util/iterator.h>
+#include <parquet/arrow/writer.h>
+
+#include <iostream>
+#include <vector>
+
+namespace ds = arrow::dataset;
+namespace fs = arrow::fs;
+namespace cp = arrow::compute;
+
+#define ABORT_ON_FAILURE(expr) \
+ do { \
+ arrow::Status status_ = (expr); \
+ if (!status_.ok()) { \
+ std::cerr << status_.message() << std::endl; \
+ abort(); \
+ } \
+ } while (0);
+
+// (Doc section: Reading Datasets)
+// Generate some data for the rest of this example.
+std::shared_ptr<arrow::Table> CreateTable() {
+ auto schema =
+ arrow::schema({arrow::field("a", arrow::int64()), arrow::field("b", arrow::int64()),
+ arrow::field("c", arrow::int64())});
+ std::shared_ptr<arrow::Array> array_a;
+ std::shared_ptr<arrow::Array> array_b;
+ std::shared_ptr<arrow::Array> array_c;
+ arrow::NumericBuilder<arrow::Int64Type> builder;
+ ABORT_ON_FAILURE(builder.AppendValues({0, 1, 2, 3, 4, 5, 6, 7, 8, 9}));
+ ABORT_ON_FAILURE(builder.Finish(&array_a));
+ builder.Reset();
+ ABORT_ON_FAILURE(builder.AppendValues({9, 8, 7, 6, 5, 4, 3, 2, 1, 0}));
+ ABORT_ON_FAILURE(builder.Finish(&array_b));
+ builder.Reset();
+ ABORT_ON_FAILURE(builder.AppendValues({1, 2, 1, 2, 1, 2, 1, 2, 1, 2}));
+ ABORT_ON_FAILURE(builder.Finish(&array_c));
+ return arrow::Table::Make(schema, {array_a, array_b, array_c});
+}
+
+// Set up a dataset by writing two Parquet files.
+std::string CreateExampleParquetDataset(const std::shared_ptr<fs::FileSystem>& filesystem,
+ const std::string& root_path) {
+ auto base_path = root_path + "/parquet_dataset";
+ ABORT_ON_FAILURE(filesystem->CreateDir(base_path));
+ // Create an Arrow Table
+ auto table = CreateTable();
+ // Write it into two Parquet files
+ auto output = filesystem->OpenOutputStream(base_path + "/data1.parquet").ValueOrDie();
+ ABORT_ON_FAILURE(parquet::arrow::WriteTable(
+ *table->Slice(0, 5), arrow::default_memory_pool(), output, /*chunk_size=*/2048));
+ output = filesystem->OpenOutputStream(base_path + "/data2.parquet").ValueOrDie();
+ ABORT_ON_FAILURE(parquet::arrow::WriteTable(
+ *table->Slice(5), arrow::default_memory_pool(), output, /*chunk_size=*/2048));
+ return base_path;
+}
+// (Doc section: Reading Datasets)
+
+// (Doc section: Reading different file formats)
+// Set up a dataset by writing two Feather files.
+std::string CreateExampleFeatherDataset(const std::shared_ptr<fs::FileSystem>& filesystem,
+ const std::string& root_path) {
+ auto base_path = root_path + "/feather_dataset";
+ ABORT_ON_FAILURE(filesystem->CreateDir(base_path));
+ // Create an Arrow Table
+ auto table = CreateTable();
+ // Write it into two Feather files
+ auto output = filesystem->OpenOutputStream(base_path + "/data1.feather").ValueOrDie();
+ auto writer = arrow::ipc::MakeFileWriter(output.get(), table->schema()).ValueOrDie();
+ ABORT_ON_FAILURE(writer->WriteTable(*table->Slice(0, 5)));
+ ABORT_ON_FAILURE(writer->Close());
+ output = filesystem->OpenOutputStream(base_path + "/data2.feather").ValueOrDie();
+ writer = arrow::ipc::MakeFileWriter(output.get(), table->schema()).ValueOrDie();
+ ABORT_ON_FAILURE(writer->WriteTable(*table->Slice(5)));
+ ABORT_ON_FAILURE(writer->Close());
+ return base_path;
+}
+// (Doc section: Reading different file formats)
+
+// (Doc section: Reading and writing partitioned data)
+// Set up a dataset by writing files with partitioning
+std::string CreateExampleParquetHivePartitionedDataset(
+ const std::shared_ptr<fs::FileSystem>& filesystem, const std::string& root_path) {
+ auto base_path = root_path + "/parquet_dataset";
+ ABORT_ON_FAILURE(filesystem->CreateDir(base_path));
+ // Create an Arrow Table
+ auto schema = arrow::schema(
+ {arrow::field("a", arrow::int64()), arrow::field("b", arrow::int64()),
+ arrow::field("c", arrow::int64()), arrow::field("part", arrow::utf8())});
+ std::vector<std::shared_ptr<arrow::Array>> arrays(4);
+ arrow::NumericBuilder<arrow::Int64Type> builder;
+ ABORT_ON_FAILURE(builder.AppendValues({0, 1, 2, 3, 4, 5, 6, 7, 8, 9}));
+ ABORT_ON_FAILURE(builder.Finish(&arrays[0]));
+ builder.Reset();
+ ABORT_ON_FAILURE(builder.AppendValues({9, 8, 7, 6, 5, 4, 3, 2, 1, 0}));
+ ABORT_ON_FAILURE(builder.Finish(&arrays[1]));
+ builder.Reset();
+ ABORT_ON_FAILURE(builder.AppendValues({1, 2, 1, 2, 1, 2, 1, 2, 1, 2}));
+ ABORT_ON_FAILURE(builder.Finish(&arrays[2]));
+ arrow::StringBuilder string_builder;
+ ABORT_ON_FAILURE(
+ string_builder.AppendValues({"a", "a", "a", "a", "a", "b", "b", "b", "b", "b"}));
+ ABORT_ON_FAILURE(string_builder.Finish(&arrays[3]));
+ auto table = arrow::Table::Make(schema, arrays);
+ // Write it using Datasets
+ auto dataset = std::make_shared<ds::InMemoryDataset>(table);
+ auto scanner_builder = dataset->NewScan().ValueOrDie();
+ auto scanner = scanner_builder->Finish().ValueOrDie();
+
+ // The partition schema determines which fields are part of the partitioning.
+ auto partition_schema = arrow::schema({arrow::field("part", arrow::utf8())});
+ // We'll use Hive-style partitioning, which creates directories with "key=value" pairs.
+ auto partitioning = std::make_shared<ds::HivePartitioning>(partition_schema);
+ // We'll write Parquet files.
+ auto format = std::make_shared<ds::ParquetFileFormat>();
+ ds::FileSystemDatasetWriteOptions write_options;
+ write_options.file_write_options = format->DefaultWriteOptions();
+ write_options.filesystem = filesystem;
+ write_options.base_dir = base_path;
+ write_options.partitioning = partitioning;
+ write_options.basename_template = "part{i}.parquet";
+ ABORT_ON_FAILURE(ds::FileSystemDataset::Write(write_options, scanner));
+ return base_path;
+}
+// (Doc section: Reading and writing partitioned data)
+
+// (Doc section: Dataset discovery)
+// Read the whole dataset with the given format, without partitioning.
+std::shared_ptr<arrow::Table> ScanWholeDataset(
+ const std::shared_ptr<fs::FileSystem>& filesystem,
+ const std::shared_ptr<ds::FileFormat>& format, const std::string& base_dir) {
+ // Create a dataset by scanning the filesystem for files
+ fs::FileSelector selector;
+ selector.base_dir = base_dir;
+ auto factory = ds::FileSystemDatasetFactory::Make(filesystem, selector, format,
+ ds::FileSystemFactoryOptions())
+ .ValueOrDie();
+ auto dataset = factory->Finish().ValueOrDie();
+ // Print out the fragments
+ for (const auto& fragment : dataset->GetFragments().ValueOrDie()) {
+ std::cout << "Found fragment: " << (*fragment)->ToString() << std::endl;
+ }
+ // Read the entire dataset as a Table
+ auto scan_builder = dataset->NewScan().ValueOrDie();
+ auto scanner = scan_builder->Finish().ValueOrDie();
+ return scanner->ToTable().ValueOrDie();
+}
+// (Doc section: Dataset discovery)
+
+// (Doc section: Filtering data)
+// Read a dataset, but select only column "b" and only rows where b < 4.
+//
+// This is useful when you only want a few columns from a dataset. Where possible,
+// Datasets will push down the column selection such that less work is done.
+std::shared_ptr<arrow::Table> FilterAndSelectDataset(
+ const std::shared_ptr<fs::FileSystem>& filesystem,
+ const std::shared_ptr<ds::FileFormat>& format, const std::string& base_dir) {
+ fs::FileSelector selector;
+ selector.base_dir = base_dir;
+ auto factory = ds::FileSystemDatasetFactory::Make(filesystem, selector, format,
+ ds::FileSystemFactoryOptions())
+ .ValueOrDie();
+ auto dataset = factory->Finish().ValueOrDie();
+ // Read specified columns with a row filter
+ auto scan_builder = dataset->NewScan().ValueOrDie();
+ ABORT_ON_FAILURE(scan_builder->Project({"b"}));
+ ABORT_ON_FAILURE(scan_builder->Filter(cp::less(cp::field_ref("b"), cp::literal(4))));
+ auto scanner = scan_builder->Finish().ValueOrDie();
+ return scanner->ToTable().ValueOrDie();
+}
+// (Doc section: Filtering data)
+
+// (Doc section: Projecting columns)
+// Read a dataset, but with column projection.
+//
+// This is useful to derive new columns from existing data. For example, here we
+// demonstrate casting a column to a different type, and turning a numeric column into a
+// boolean column based on a predicate. You could also rename columns or perform
+// computations involving multiple columns.
+std::shared_ptr<arrow::Table> ProjectDataset(
+ const std::shared_ptr<fs::FileSystem>& filesystem,
+ const std::shared_ptr<ds::FileFormat>& format, const std::string& base_dir) {
+ fs::FileSelector selector;
+ selector.base_dir = base_dir;
+ auto factory = ds::FileSystemDatasetFactory::Make(filesystem, selector, format,
+ ds::FileSystemFactoryOptions())
+ .ValueOrDie();
+ auto dataset = factory->Finish().ValueOrDie();
+ // Read specified columns with a row filter
+ auto scan_builder = dataset->NewScan().ValueOrDie();
+ ABORT_ON_FAILURE(scan_builder->Project(
+ {
+ // Leave column "a" as-is.
+ cp::field_ref("a"),
+ // Cast column "b" to float32.
+ cp::call("cast", {cp::field_ref("b")},
+ arrow::compute::CastOptions::Safe(arrow::float32())),
+ // Derive a boolean column from "c".
+ cp::equal(cp::field_ref("c"), cp::literal(1)),
+ },
+ {"a_renamed", "b_as_float32", "c_1"}));
+ auto scanner = scan_builder->Finish().ValueOrDie();
+ return scanner->ToTable().ValueOrDie();
+}
+// (Doc section: Projecting columns)
+
+// (Doc section: Projecting columns #2)
+// Read a dataset, but with column projection.
+//
+// This time, we read all original columns plus one derived column. This simply combines
+// the previous two examples: selecting a subset of columns by name, and deriving new
+// columns with an expression.
+std::shared_ptr<arrow::Table> SelectAndProjectDataset(
+ const std::shared_ptr<fs::FileSystem>& filesystem,
+ const std::shared_ptr<ds::FileFormat>& format, const std::string& base_dir) {
+ fs::FileSelector selector;
+ selector.base_dir = base_dir;
+ auto factory = ds::FileSystemDatasetFactory::Make(filesystem, selector, format,
+ ds::FileSystemFactoryOptions())
+ .ValueOrDie();
+ auto dataset = factory->Finish().ValueOrDie();
+ // Read specified columns with a row filter
+ auto scan_builder = dataset->NewScan().ValueOrDie();
+ std::vector<std::string> names;
+ std::vector<cp::Expression> exprs;
+ // Read all the original columns.
+ for (const auto& field : dataset->schema()->fields()) {
+ names.push_back(field->name());
+ exprs.push_back(cp::field_ref(field->name()));
+ }
+ // Also derive a new column.
+ names.emplace_back("b_large");
+ exprs.push_back(cp::greater(cp::field_ref("b"), cp::literal(1)));
+ ABORT_ON_FAILURE(scan_builder->Project(exprs, names));
+ auto scanner = scan_builder->Finish().ValueOrDie();
+ return scanner->ToTable().ValueOrDie();
+}
+// (Doc section: Projecting columns #2)
+
+// (Doc section: Reading and writing partitioned data #2)
+// Read an entire dataset, but with partitioning information.
+std::shared_ptr<arrow::Table> ScanPartitionedDataset(
+ const std::shared_ptr<fs::FileSystem>& filesystem,
+ const std::shared_ptr<ds::FileFormat>& format, const std::string& base_dir) {
+ fs::FileSelector selector;
+ selector.base_dir = base_dir;
+ selector.recursive = true; // Make sure to search subdirectories
+ ds::FileSystemFactoryOptions options;
+ // We'll use Hive-style partitioning. We'll let Arrow Datasets infer the partition
+ // schema.
+ options.partitioning = ds::HivePartitioning::MakeFactory();
+ auto factory = ds::FileSystemDatasetFactory::Make(filesystem, selector, format, options)
+ .ValueOrDie();
+ auto dataset = factory->Finish().ValueOrDie();
+ // Print out the fragments
+ for (const auto& fragment : dataset->GetFragments().ValueOrDie()) {
+ std::cout << "Found fragment: " << (*fragment)->ToString() << std::endl;
+ std::cout << "Partition expression: "
+ << (*fragment)->partition_expression().ToString() << std::endl;
+ }
+ auto scan_builder = dataset->NewScan().ValueOrDie();
+ auto scanner = scan_builder->Finish().ValueOrDie();
+ return scanner->ToTable().ValueOrDie();
+}
+// (Doc section: Reading and writing partitioned data #2)
+
+// (Doc section: Reading and writing partitioned data #3)
+// Read an entire dataset, but with partitioning information. Also, filter the dataset on
+// the partition values.
+std::shared_ptr<arrow::Table> FilterPartitionedDataset(
+ const std::shared_ptr<fs::FileSystem>& filesystem,
+ const std::shared_ptr<ds::FileFormat>& format, const std::string& base_dir) {
+ fs::FileSelector selector;
+ selector.base_dir = base_dir;
+ selector.recursive = true;
+ ds::FileSystemFactoryOptions options;
+ options.partitioning = ds::HivePartitioning::MakeFactory();
+ auto factory = ds::FileSystemDatasetFactory::Make(filesystem, selector, format, options)
+ .ValueOrDie();
+ auto dataset = factory->Finish().ValueOrDie();
+ auto scan_builder = dataset->NewScan().ValueOrDie();
+ // Filter based on the partition values. This will mean that we won't even read the
+ // files whose partition expressions don't match the filter.
+ ABORT_ON_FAILURE(
+ scan_builder->Filter(cp::equal(cp::field_ref("part"), cp::literal("b"))));
+ auto scanner = scan_builder->Finish().ValueOrDie();
+ return scanner->ToTable().ValueOrDie();
+}
+// (Doc section: Reading and writing partitioned data #3)
+
+int main(int argc, char** argv) {
+ if (argc < 3) {
+ // Fake success for CI purposes.
+ return EXIT_SUCCESS;
+ }
+
+ std::string uri = argv[1];
+ std::string format_name = argv[2];
+ std::string mode = argc > 3 ? argv[3] : "no_filter";
+ std::string root_path;
+ auto fs = fs::FileSystemFromUri(uri, &root_path).ValueOrDie();
+
+ std::string base_path;
+ std::shared_ptr<ds::FileFormat> format;
+ if (format_name == "feather") {
+ format = std::make_shared<ds::IpcFileFormat>();
+ base_path = CreateExampleFeatherDataset(fs, root_path);
+ } else if (format_name == "parquet") {
+ format = std::make_shared<ds::ParquetFileFormat>();
+ base_path = CreateExampleParquetDataset(fs, root_path);
+ } else if (format_name == "parquet_hive") {
+ format = std::make_shared<ds::ParquetFileFormat>();
+ base_path = CreateExampleParquetHivePartitionedDataset(fs, root_path);
+ } else {
+ std::cerr << "Unknown format: " << format_name << std::endl;
+ std::cerr << "Supported formats: feather, parquet, parquet_hive" << std::endl;
+ return EXIT_FAILURE;
+ }
+
+ std::shared_ptr<arrow::Table> table;
+ if (mode == "no_filter") {
+ table = ScanWholeDataset(fs, format, base_path);
+ } else if (mode == "filter") {
+ table = FilterAndSelectDataset(fs, format, base_path);
+ } else if (mode == "project") {
+ table = ProjectDataset(fs, format, base_path);
+ } else if (mode == "select_project") {
+ table = SelectAndProjectDataset(fs, format, base_path);
+ } else if (mode == "partitioned") {
+ table = ScanPartitionedDataset(fs, format, base_path);
+ } else if (mode == "filter_partitioned") {
+ table = FilterPartitionedDataset(fs, format, base_path);
+ } else {
+ std::cerr << "Unknown mode: " << mode << std::endl;
+ std::cerr
+ << "Supported modes: no_filter, filter, project, select_project, partitioned"
+ << std::endl;
+ return EXIT_FAILURE;
+ }
+ std::cout << "Read " << table->num_rows() << " rows" << std::endl;
+ std::cout << table->ToString() << std::endl;
+ return EXIT_SUCCESS;
+}
diff --git a/src/arrow/cpp/examples/arrow/dataset_parquet_scan_example.cc b/src/arrow/cpp/examples/arrow/dataset_parquet_scan_example.cc
new file mode 100644
index 000000000..cd9b89fe3
--- /dev/null
+++ b/src/arrow/cpp/examples/arrow/dataset_parquet_scan_example.cc
@@ -0,0 +1,190 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#include <arrow/api.h>
+#include <arrow/compute/exec/expression.h>
+#include <arrow/dataset/dataset.h>
+#include <arrow/dataset/discovery.h>
+#include <arrow/dataset/file_base.h>
+#include <arrow/dataset/file_parquet.h>
+#include <arrow/dataset/scanner.h>
+#include <arrow/filesystem/filesystem.h>
+#include <arrow/filesystem/path_util.h>
+
+#include <cstdlib>
+#include <iostream>
+
+using arrow::field;
+using arrow::int16;
+using arrow::Schema;
+using arrow::Table;
+
+namespace fs = arrow::fs;
+
+namespace ds = arrow::dataset;
+
+namespace cp = arrow::compute;
+
+#define ABORT_ON_FAILURE(expr) \
+ do { \
+ arrow::Status status_ = (expr); \
+ if (!status_.ok()) { \
+ std::cerr << status_.message() << std::endl; \
+ abort(); \
+ } \
+ } while (0);
+
+struct Configuration {
+ // Increase the ds::DataSet by repeating `repeat` times the ds::Dataset.
+ size_t repeat = 1;
+
+ // Indicates if the Scanner::ToTable should consume in parallel.
+ bool use_threads = true;
+
+ // Indicates to the Scan operator which columns are requested. This
+ // optimization avoid deserializing unneeded columns.
+ std::vector<std::string> projected_columns = {"pickup_at", "dropoff_at",
+ "total_amount"};
+
+ // Indicates the filter by which rows will be filtered. This optimization can
+ // make use of partition information and/or file metadata if possible.
+ cp::Expression filter =
+ cp::greater(cp::field_ref("total_amount"), cp::literal(1000.0f));
+
+ ds::InspectOptions inspect_options{};
+ ds::FinishOptions finish_options{};
+} conf;
+
+std::shared_ptr<fs::FileSystem> GetFileSystemFromUri(const std::string& uri,
+ std::string* path) {
+ return fs::FileSystemFromUri(uri, path).ValueOrDie();
+}
+
+std::shared_ptr<ds::Dataset> GetDatasetFromDirectory(
+ std::shared_ptr<fs::FileSystem> fs, std::shared_ptr<ds::ParquetFileFormat> format,
+ std::string dir) {
+ // Find all files under `path`
+ fs::FileSelector s;
+ s.base_dir = dir;
+ s.recursive = true;
+
+ ds::FileSystemFactoryOptions options;
+ // The factory will try to build a child dataset.
+ auto factory = ds::FileSystemDatasetFactory::Make(fs, s, format, options).ValueOrDie();
+
+ // Try to infer a common schema for all files.
+ auto schema = factory->Inspect(conf.inspect_options).ValueOrDie();
+ // Caller can optionally decide another schema as long as it is compatible
+ // with the previous one, e.g. `factory->Finish(compatible_schema)`.
+ auto child = factory->Finish(conf.finish_options).ValueOrDie();
+
+ ds::DatasetVector children{conf.repeat, child};
+ auto dataset = ds::UnionDataset::Make(std::move(schema), std::move(children));
+
+ return dataset.ValueOrDie();
+}
+
+std::shared_ptr<ds::Dataset> GetParquetDatasetFromMetadata(
+ std::shared_ptr<fs::FileSystem> fs, std::shared_ptr<ds::ParquetFileFormat> format,
+ std::string metadata_path) {
+ ds::ParquetFactoryOptions options;
+ auto factory =
+ ds::ParquetDatasetFactory::Make(metadata_path, fs, format, options).ValueOrDie();
+ return factory->Finish().ValueOrDie();
+}
+
+std::shared_ptr<ds::Dataset> GetDatasetFromFile(
+ std::shared_ptr<fs::FileSystem> fs, std::shared_ptr<ds::ParquetFileFormat> format,
+ std::string file) {
+ ds::FileSystemFactoryOptions options;
+ // The factory will try to build a child dataset.
+ auto factory =
+ ds::FileSystemDatasetFactory::Make(fs, {file}, format, options).ValueOrDie();
+
+ // Try to infer a common schema for all files.
+ auto schema = factory->Inspect(conf.inspect_options).ValueOrDie();
+ // Caller can optionally decide another schema as long as it is compatible
+ // with the previous one, e.g. `factory->Finish(compatible_schema)`.
+ auto child = factory->Finish(conf.finish_options).ValueOrDie();
+
+ ds::DatasetVector children;
+ children.resize(conf.repeat, child);
+ auto dataset = ds::UnionDataset::Make(std::move(schema), std::move(children));
+
+ return dataset.ValueOrDie();
+}
+
+std::shared_ptr<ds::Dataset> GetDatasetFromPath(
+ std::shared_ptr<fs::FileSystem> fs, std::shared_ptr<ds::ParquetFileFormat> format,
+ std::string path) {
+ auto info = fs->GetFileInfo(path).ValueOrDie();
+ if (info.IsDirectory()) {
+ return GetDatasetFromDirectory(fs, format, path);
+ }
+
+ auto dirname_basename = arrow::fs::internal::GetAbstractPathParent(path);
+ auto basename = dirname_basename.second;
+
+ if (basename == "_metadata") {
+ return GetParquetDatasetFromMetadata(fs, format, path);
+ }
+
+ return GetDatasetFromFile(fs, format, path);
+}
+
+std::shared_ptr<ds::Scanner> GetScannerFromDataset(std::shared_ptr<ds::Dataset> dataset,
+ std::vector<std::string> columns,
+ cp::Expression filter,
+ bool use_threads) {
+ auto scanner_builder = dataset->NewScan().ValueOrDie();
+
+ if (!columns.empty()) {
+ ABORT_ON_FAILURE(scanner_builder->Project(columns));
+ }
+
+ ABORT_ON_FAILURE(scanner_builder->Filter(filter));
+
+ ABORT_ON_FAILURE(scanner_builder->UseThreads(use_threads));
+
+ return scanner_builder->Finish().ValueOrDie();
+}
+
+std::shared_ptr<Table> GetTableFromScanner(std::shared_ptr<ds::Scanner> scanner) {
+ return scanner->ToTable().ValueOrDie();
+}
+
+int main(int argc, char** argv) {
+ auto format = std::make_shared<ds::ParquetFileFormat>();
+
+ if (argc != 2) {
+ // Fake success for CI purposes.
+ return EXIT_SUCCESS;
+ }
+
+ std::string path;
+ auto fs = GetFileSystemFromUri(argv[1], &path);
+
+ auto dataset = GetDatasetFromPath(fs, format, path);
+
+ auto scanner = GetScannerFromDataset(dataset, conf.projected_columns, conf.filter,
+ conf.use_threads);
+
+ auto table = GetTableFromScanner(scanner);
+ std::cout << "Table size: " << table->num_rows() << "\n";
+
+ return EXIT_SUCCESS;
+}
diff --git a/src/arrow/cpp/examples/arrow/row_wise_conversion_example.cc b/src/arrow/cpp/examples/arrow/row_wise_conversion_example.cc
new file mode 100644
index 000000000..1af1c5547
--- /dev/null
+++ b/src/arrow/cpp/examples/arrow/row_wise_conversion_example.cc
@@ -0,0 +1,207 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#include <arrow/api.h>
+#include <arrow/result.h>
+
+#include <cstdint>
+#include <iomanip>
+#include <iostream>
+#include <vector>
+
+using arrow::DoubleBuilder;
+using arrow::Int64Builder;
+using arrow::ListBuilder;
+
+// While we want to use columnar data structures to build efficient operations, we
+// often receive data in a row-wise fashion from other systems. In the following,
+// we want give a brief introduction into the classes provided by Apache Arrow by
+// showing how to transform row-wise data into a columnar table.
+//
+// The table contains an id for a product, the number of components in the product
+// and the cost of each component.
+//
+// The data in this example is stored in the following struct:
+struct data_row {
+ int64_t id;
+ int64_t components;
+ std::vector<double> component_cost;
+};
+
+// Transforming a vector of structs into a columnar Table.
+//
+// The final representation should be an `arrow::Table` which in turn
+// is made up of an `arrow::Schema` and a list of
+// `arrow::ChunkedArray` instances. As the first step, we will iterate
+// over the data and build up the arrays incrementally. For this
+// task, we provide `arrow::ArrayBuilder` classes that help in the
+// construction of the final `arrow::Array` instances.
+//
+// For each type, Arrow has a specially typed builder class. For the primitive
+// values `id` and `components` we can use the `arrow::Int64Builder`. For the
+// `component_cost` vector, we need to have two builders, a top-level
+// `arrow::ListBuilder` that builds the array of offsets and a nested
+// `arrow::DoubleBuilder` that constructs the underlying values array that
+// is referenced by the offsets in the former array.
+arrow::Result<std::shared_ptr<arrow::Table>> VectorToColumnarTable(
+ const std::vector<struct data_row>& rows) {
+ // The builders are more efficient using
+ // arrow::jemalloc::MemoryPool::default_pool() as this can increase the size of
+ // the underlying memory regions in-place. At the moment, arrow::jemalloc is only
+ // supported on Unix systems, not Windows.
+ arrow::MemoryPool* pool = arrow::default_memory_pool();
+
+ Int64Builder id_builder(pool);
+ Int64Builder components_builder(pool);
+ ListBuilder component_cost_builder(pool, std::make_shared<DoubleBuilder>(pool));
+ // The following builder is owned by component_cost_builder.
+ DoubleBuilder* component_item_cost_builder =
+ (static_cast<DoubleBuilder*>(component_cost_builder.value_builder()));
+
+ // Now we can loop over our existing data and insert it into the builders. The
+ // `Append` calls here may fail (e.g. we cannot allocate enough additional memory).
+ // Thus we need to check their return values. For more information on these values,
+ // check the documentation about `arrow::Status`.
+ for (const data_row& row : rows) {
+ ARROW_RETURN_NOT_OK(id_builder.Append(row.id));
+ ARROW_RETURN_NOT_OK(components_builder.Append(row.components));
+
+ // Indicate the start of a new list row. This will memorise the current
+ // offset in the values builder.
+ ARROW_RETURN_NOT_OK(component_cost_builder.Append());
+ // Store the actual values. The same memory layout is
+ // used for the component cost data, in this case a vector of
+ // type double, as for the memory that Arrow uses to hold this
+ // data and will be created.
+ ARROW_RETURN_NOT_OK(component_item_cost_builder->AppendValues(
+ row.component_cost.data(), row.component_cost.size()));
+ }
+
+ // At the end, we finalise the arrays, declare the (type) schema and combine them
+ // into a single `arrow::Table`:
+ std::shared_ptr<arrow::Array> id_array;
+ ARROW_RETURN_NOT_OK(id_builder.Finish(&id_array));
+ std::shared_ptr<arrow::Array> components_array;
+ ARROW_RETURN_NOT_OK(components_builder.Finish(&components_array));
+ // No need to invoke component_cost_builder.Finish because it is implied by
+ // the parent builder's Finish invocation.
+ std::shared_ptr<arrow::Array> component_cost_array;
+ ARROW_RETURN_NOT_OK(component_cost_builder.Finish(&component_cost_array));
+
+ std::vector<std::shared_ptr<arrow::Field>> schema_vector = {
+ arrow::field("id", arrow::int64()), arrow::field("components", arrow::int64()),
+ arrow::field("component_cost", arrow::list(arrow::float64()))};
+
+ auto schema = std::make_shared<arrow::Schema>(schema_vector);
+
+ // The final `table` variable is the one we can then pass on to other functions
+ // that can consume Apache Arrow memory structures. This object has ownership of
+ // all referenced data, thus we don't have to care about undefined references once
+ // we leave the scope of the function building the table and its underlying arrays.
+ std::shared_ptr<arrow::Table> table =
+ arrow::Table::Make(schema, {id_array, components_array, component_cost_array});
+
+ return table;
+}
+
+arrow::Result<std::vector<data_row>> ColumnarTableToVector(
+ const std::shared_ptr<arrow::Table>& table) {
+ // To convert an Arrow table back into the same row-wise representation as in the
+ // above section, we first will check that the table conforms to our expected
+ // schema and then will build up the vector of rows incrementally.
+ //
+ // For the check if the table is as expected, we can utilise solely its schema.
+ std::vector<std::shared_ptr<arrow::Field>> schema_vector = {
+ arrow::field("id", arrow::int64()), arrow::field("components", arrow::int64()),
+ arrow::field("component_cost", arrow::list(arrow::float64()))};
+ auto expected_schema = std::make_shared<arrow::Schema>(schema_vector);
+
+ if (!expected_schema->Equals(*table->schema())) {
+ // The table doesn't have the expected schema thus we cannot directly
+ // convert it to our target representation.
+ return arrow::Status::Invalid("Schemas are not matching!");
+ }
+
+ // As we have ensured that the table has the expected structure, we can unpack the
+ // underlying arrays. For the primitive columns `id` and `components` we can use the
+ // high level functions to get the values whereas for the nested column
+ // `component_costs` we need to access the C-pointer to the data to copy its
+ // contents into the resulting `std::vector<double>`. Here we need to be careful to
+ // also add the offset to the pointer. This offset is needed to enable zero-copy
+ // slicing operations. While this could be adjusted automatically for double
+ // arrays, this cannot be done for the accompanying bitmap as often the slicing
+ // border would be inside a byte.
+
+ auto ids = std::static_pointer_cast<arrow::Int64Array>(table->column(0)->chunk(0));
+ auto components =
+ std::static_pointer_cast<arrow::Int64Array>(table->column(1)->chunk(0));
+ auto component_cost =
+ std::static_pointer_cast<arrow::ListArray>(table->column(2)->chunk(0));
+ auto component_cost_values =
+ std::static_pointer_cast<arrow::DoubleArray>(component_cost->values());
+ // To enable zero-copy slices, the native values pointer might need to account
+ // for this slicing offset. This is not needed for the higher level functions
+ // like Value(…) that already account for this offset internally.
+ const double* ccv_ptr = component_cost_values->raw_values();
+ std::vector<data_row> rows;
+ for (int64_t i = 0; i < table->num_rows(); i++) {
+ // Another simplification in this example is that we assume that there are
+ // no null entries, e.g. each row is fill with valid values.
+ int64_t id = ids->Value(i);
+ int64_t component = components->Value(i);
+ const double* first = ccv_ptr + component_cost->value_offset(i);
+ const double* last = ccv_ptr + component_cost->value_offset(i + 1);
+ std::vector<double> components_vec(first, last);
+ rows.push_back({id, component, components_vec});
+ }
+
+ return rows;
+}
+
+int main(int argc, char** argv) {
+ std::vector<data_row> rows = {
+ {1, 1, {10.0}}, {2, 3, {11.0, 12.0, 13.0}}, {3, 2, {15.0, 25.0}}};
+ std::shared_ptr<arrow::Table> table;
+ std::vector<data_row> expected_rows;
+
+ arrow::Result<std::shared_ptr<arrow::Table>> table_result = VectorToColumnarTable(rows);
+ table = std::move(table_result).ValueOrDie();
+
+ arrow::Result<std::vector<data_row>> expected_rows_result =
+ ColumnarTableToVector(table);
+ expected_rows = std::move(expected_rows_result).ValueOrDie();
+
+ assert(rows.size() == expected_rows.size());
+
+ // Print out contents of table, should get
+ // ID Components Component prices
+ // 1 1 10
+ // 2 3 11 12 13
+ // 3 2 15 25
+ std::cout << std::left << std::setw(3) << "ID " << std::left << std::setw(11)
+ << "Components " << std::left << std::setw(15) << "Component prices "
+ << std::endl;
+ for (const auto& row : rows) {
+ std::cout << std::left << std::setw(3) << row.id << std::left << std::setw(11)
+ << row.components;
+ for (const auto& cost : row.component_cost) {
+ std::cout << std::left << std::setw(4) << cost;
+ }
+ std::cout << std::endl;
+ }
+ return EXIT_SUCCESS;
+}
diff --git a/src/arrow/cpp/examples/minimal_build/.gitignore b/src/arrow/cpp/examples/minimal_build/.gitignore
new file mode 100644
index 000000000..c94f3ec42
--- /dev/null
+++ b/src/arrow/cpp/examples/minimal_build/.gitignore
@@ -0,0 +1,18 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+test.arrow
diff --git a/src/arrow/cpp/examples/minimal_build/CMakeLists.txt b/src/arrow/cpp/examples/minimal_build/CMakeLists.txt
new file mode 100644
index 000000000..9fc20c70f
--- /dev/null
+++ b/src/arrow/cpp/examples/minimal_build/CMakeLists.txt
@@ -0,0 +1,40 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+cmake_minimum_required(VERSION 3.0)
+
+project(ArrowMinimalExample)
+
+option(ARROW_LINK_SHARED "Link to the Arrow shared library" ON)
+
+find_package(Arrow REQUIRED)
+
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_BUILD_TYPE Release)
+
+message(STATUS "Arrow version: ${ARROW_VERSION}")
+message(STATUS "Arrow SO version: ${ARROW_FULL_SO_VERSION}")
+
+add_executable(arrow_example example.cc)
+
+if (ARROW_LINK_SHARED)
+ target_link_libraries(arrow_example PRIVATE arrow_shared)
+else()
+ set(THREADS_PREFER_PTHREAD_FLAG ON)
+ find_package(Threads REQUIRED)
+ target_link_libraries(arrow_example PRIVATE arrow_static Threads::Threads)
+endif()
diff --git a/src/arrow/cpp/examples/minimal_build/README.md b/src/arrow/cpp/examples/minimal_build/README.md
new file mode 100644
index 000000000..9f889f6ad
--- /dev/null
+++ b/src/arrow/cpp/examples/minimal_build/README.md
@@ -0,0 +1,88 @@
+<!---
+ Licensed to the Apache Software Foundation (ASF) under one
+ or more contributor license agreements. See the NOTICE file
+ distributed with this work for additional information
+ regarding copyright ownership. The ASF licenses this file
+ to you under the Apache License, Version 2.0 (the
+ "License"); you may not use this file except in compliance
+ with the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing,
+ software distributed under the License is distributed on an
+ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ KIND, either express or implied. See the License for the
+ specific language governing permissions and limitations
+ under the License.
+-->
+
+# Minimal C++ build example
+
+This directory showcases a minimal build of Arrow C++ (in `build_arrow.sh`).
+This minimal build is then used by an example third-party C++ project
+using CMake logic to compile and link against the Arrow C++ library
+(in `build_example.sh` and `CMakeLists.txt`).
+
+When run, the example executable reads a file named `test.csv`,
+displays its parsed contents, and then saves them in Arrow IPC format in
+a file named `test.arrow`.
+
+## Running the example
+
+You can run this simple example using [Docker Compose][docker-compose]
+and the given `docker-compose.yml` and dockerfiles, which installs a
+minimal Ubuntu image with a basic C++ toolchain.
+
+Just open a terminal in this directory and run the following commands:
+
+```bash
+docker-compose run --rm minimal
+```
+
+Note that this example mounts two volumes inside the Docker image:
+* `/arrow` points to the Arrow source tree
+* `/io` points to this example directory
+
+## Statically-linked builds
+
+We've provided an example build configuration here with CMake to show how to
+create a statically-linked executable with bundled dependencies.
+
+To run it on Linux, you can use the above Docker image:
+
+```bash
+docker-compose run --rm static
+```
+
+On macOS, you can use the `run_static.sh` but you must set some environment
+variables to point the script to your Arrow checkout, for example:
+
+```bash
+export ARROW_DIR=path/to/arrow-clone
+export EXAMPLE_DIR=$ARROW_DIR/cpp/examples/minimal_build
+export ARROW_BUILD_DIR=$(pwd)/arrow-build
+export EXAMPLE_BUILD_DIR=$(pwd)/example
+
+./run_static.sh
+```
+
+On Windows, you can run `run_static.bat` from the command prompt with Visual
+Studio's command line tools enabled and CMake and ninja build in the path:
+
+```
+call run_static.bat
+```
+
+### Static linking against system libraries
+
+You can also use static libraries of Arrow's dependencies from the
+system. To run this configuration, set
+`ARROW_DEPENDENCY_SOURCE=SYSTEM` for `run_static.sh`. You can use
+`docker-compose` for this too:
+
+```bash
+docker-compose run --rm static-system-dependency
+```
+
+[docker-compose]: https://docs.docker.com/compose/
diff --git a/src/arrow/cpp/examples/minimal_build/build_arrow.sh b/src/arrow/cpp/examples/minimal_build/build_arrow.sh
new file mode 100755
index 000000000..402c312e4
--- /dev/null
+++ b/src/arrow/cpp/examples/minimal_build/build_arrow.sh
@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+set -ex
+
+NPROC=$(nproc)
+
+mkdir -p $ARROW_BUILD_DIR
+pushd $ARROW_BUILD_DIR
+
+# Enable the CSV reader as it's used by the example third-party build
+cmake /arrow/cpp \
+ -DARROW_CSV=ON \
+ -DARROW_JEMALLOC=OFF \
+ $ARROW_CMAKE_OPTIONS
+
+make -j$NPROC
+make install
+
+popd
diff --git a/src/arrow/cpp/examples/minimal_build/build_example.sh b/src/arrow/cpp/examples/minimal_build/build_example.sh
new file mode 100755
index 000000000..a315755a5
--- /dev/null
+++ b/src/arrow/cpp/examples/minimal_build/build_example.sh
@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+set -ex
+
+mkdir -p $EXAMPLE_BUILD_DIR
+pushd $EXAMPLE_BUILD_DIR
+
+cmake /io
+make
+
+popd
diff --git a/src/arrow/cpp/examples/minimal_build/docker-compose.yml b/src/arrow/cpp/examples/minimal_build/docker-compose.yml
new file mode 100644
index 000000000..6e2dcef81
--- /dev/null
+++ b/src/arrow/cpp/examples/minimal_build/docker-compose.yml
@@ -0,0 +1,51 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+version: '3.5'
+
+services:
+ minimal:
+ build:
+ context: .
+ dockerfile: minimal.dockerfile
+ volumes:
+ - ../../../:/arrow:delegated
+ - .:/io:delegated
+ command:
+ - "/io/run.sh"
+
+ static:
+ build:
+ context: .
+ dockerfile: minimal.dockerfile
+ volumes:
+ - ../../../:/arrow:delegated
+ - .:/io:delegated
+ command:
+ - "/io/run_static.sh"
+
+ static-system-dependency:
+ build:
+ context: .
+ dockerfile: system_dependency.dockerfile
+ environment:
+ ARROW_DEPENDENCY_SOURCE: "SYSTEM"
+ volumes:
+ - ../../../:/arrow:delegated
+ - .:/io:delegated
+ command:
+ - "/io/run_static.sh"
diff --git a/src/arrow/cpp/examples/minimal_build/example.cc b/src/arrow/cpp/examples/minimal_build/example.cc
new file mode 100644
index 000000000..9bfb9953e
--- /dev/null
+++ b/src/arrow/cpp/examples/minimal_build/example.cc
@@ -0,0 +1,69 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#include <arrow/csv/api.h>
+#include <arrow/io/api.h>
+#include <arrow/ipc/api.h>
+#include <arrow/pretty_print.h>
+#include <arrow/result.h>
+#include <arrow/status.h>
+#include <arrow/table.h>
+
+#include <iostream>
+
+using arrow::Status;
+
+namespace {
+
+Status RunMain(int argc, char** argv) {
+ const char* csv_filename = "test.csv";
+ const char* arrow_filename = "test.arrow";
+
+ std::cerr << "* Reading CSV file '" << csv_filename << "' into table" << std::endl;
+ ARROW_ASSIGN_OR_RAISE(auto input_file, arrow::io::ReadableFile::Open(csv_filename));
+ ARROW_ASSIGN_OR_RAISE(auto csv_reader, arrow::csv::TableReader::Make(
+ arrow::io::default_io_context(), input_file,
+ arrow::csv::ReadOptions::Defaults(),
+ arrow::csv::ParseOptions::Defaults(),
+ arrow::csv::ConvertOptions::Defaults()));
+ ARROW_ASSIGN_OR_RAISE(auto table, csv_reader->Read());
+
+ std::cerr << "* Read table:" << std::endl;
+ ARROW_RETURN_NOT_OK(arrow::PrettyPrint(*table, {}, &std::cerr));
+
+ std::cerr << "* Writing table into Arrow IPC file '" << arrow_filename << "'"
+ << std::endl;
+ ARROW_ASSIGN_OR_RAISE(auto output_file,
+ arrow::io::FileOutputStream::Open(arrow_filename));
+ ARROW_ASSIGN_OR_RAISE(auto batch_writer,
+ arrow::ipc::MakeFileWriter(output_file, table->schema()));
+ ARROW_RETURN_NOT_OK(batch_writer->WriteTable(*table));
+ ARROW_RETURN_NOT_OK(batch_writer->Close());
+
+ return Status::OK();
+}
+
+} // namespace
+
+int main(int argc, char** argv) {
+ Status st = RunMain(argc, argv);
+ if (!st.ok()) {
+ std::cerr << st << std::endl;
+ return 1;
+ }
+ return 0;
+}
diff --git a/src/arrow/cpp/examples/minimal_build/minimal.dockerfile b/src/arrow/cpp/examples/minimal_build/minimal.dockerfile
new file mode 100644
index 000000000..9361fc5e8
--- /dev/null
+++ b/src/arrow/cpp/examples/minimal_build/minimal.dockerfile
@@ -0,0 +1,27 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+FROM ubuntu:focal
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update -y -q && \
+ apt-get install -y -q --no-install-recommends \
+ build-essential \
+ cmake \
+ pkg-config && \
+ apt-get clean && rm -rf /var/lib/apt/lists*
diff --git a/src/arrow/cpp/examples/minimal_build/run.sh b/src/arrow/cpp/examples/minimal_build/run.sh
new file mode 100755
index 000000000..a76058b0b
--- /dev/null
+++ b/src/arrow/cpp/examples/minimal_build/run.sh
@@ -0,0 +1,48 @@
+#!/usr/bin/env bash
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+set -e
+
+cd /io
+
+export ARROW_BUILD_DIR=/build/arrow
+export EXAMPLE_BUILD_DIR=/build/example
+
+echo
+echo "=="
+echo "== Building Arrow C++ library"
+echo "=="
+echo
+
+./build_arrow.sh
+
+echo
+echo "=="
+echo "== Building example project using Arrow C++ library"
+echo "=="
+echo
+
+./build_example.sh
+
+echo
+echo "=="
+echo "== Running example project"
+echo "=="
+echo
+
+${EXAMPLE_BUILD_DIR}/arrow_example
diff --git a/src/arrow/cpp/examples/minimal_build/run_static.bat b/src/arrow/cpp/examples/minimal_build/run_static.bat
new file mode 100644
index 000000000..bbc7ff8f7
--- /dev/null
+++ b/src/arrow/cpp/examples/minimal_build/run_static.bat
@@ -0,0 +1,88 @@
+@rem Licensed to the Apache Software Foundation (ASF) under one
+@rem or more contributor license agreements. See the NOTICE file
+@rem distributed with this work for additional information
+@rem regarding copyright ownership. The ASF licenses this file
+@rem to you under the Apache License, Version 2.0 (the
+@rem "License"); you may not use this file except in compliance
+@rem with the License. You may obtain a copy of the License at
+@rem
+@rem http://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing,
+@rem software distributed under the License is distributed on an
+@rem "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@rem KIND, either express or implied. See the License for the
+@rem specific language governing permissions and limitations
+@rem under the License.
+
+@echo on
+
+@rem clean up prior attempts
+if exist "arrow-build" rd arrow-build /s /q
+if exist "dist" rd dist /s /q
+if exist "example" rd example /s /q
+
+echo
+echo "=="
+echo "== Building Arrow C++ library"
+echo "=="
+echo
+
+set INSTALL_PREFIX=%cd%\dist
+
+mkdir arrow-build
+pushd arrow-build
+
+@rem bzip2_ep fails with this method
+
+cmake ..\..\.. ^
+ -GNinja ^
+ -DCMAKE_INSTALL_PREFIX=%INSTALL_PREFIX% ^
+ -DARROW_DEPENDENCY_SOURCE=BUNDLED ^
+ -DARROW_BUILD_SHARED=OFF ^
+ -DARROW_BUILD_STATIC=ON ^
+ -DARROW_COMPUTE=ON ^
+ -DARROW_CSV=ON ^
+ -DARROW_DATASET=ON ^
+ -DARROW_FILESYSTEM=ON ^
+ -DARROW_HDFS=ON ^
+ -DARROW_JSON=ON ^
+ -DARROW_MIMALLOC=ON ^
+ -DARROW_ORC=ON ^
+ -DARROW_PARQUET=ON ^
+ -DARROW_PLASMA=ON ^
+ -DARROW_WITH_BROTLI=ON ^
+ -DARROW_WITH_BZ2=OFF ^
+ -DARROW_WITH_LZ4=ON ^
+ -DARROW_WITH_SNAPPY=ON ^
+ -DARROW_WITH_ZLIB=ON ^
+ -DARROW_WITH_ZSTD=ON
+
+ninja install
+
+popd
+
+echo
+echo "=="
+echo "== Building example project using Arrow C++ library"
+echo "=="
+echo
+
+mkdir example
+pushd example
+
+cmake .. ^
+ -GNinja ^
+ -DCMAKE_PREFIX_PATH="%INSTALL_PREFIX%" ^
+ -DARROW_LINK_SHARED=OFF
+ninja
+
+popd
+
+echo
+echo "=="
+echo "== Running example project"
+echo "=="
+echo
+
+call example\arrow_example.exe
diff --git a/src/arrow/cpp/examples/minimal_build/run_static.sh b/src/arrow/cpp/examples/minimal_build/run_static.sh
new file mode 100755
index 000000000..ff3bb8945
--- /dev/null
+++ b/src/arrow/cpp/examples/minimal_build/run_static.sh
@@ -0,0 +1,121 @@
+#!/usr/bin/env bash
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+set -e
+
+: ${ARROW_DIR:=/arrow}
+: ${EXAMPLE_DIR:=/io}
+: ${ARROW_BUILD_DIR:=/build/arrow}
+: ${EXAMPLE_BUILD_DIR:=/build/example}
+
+: ${ARROW_DEPENDENCY_SOURCE:=BUNDLED}
+
+echo
+echo "=="
+echo "== Building Arrow C++ library"
+echo "=="
+echo
+
+mkdir -p $ARROW_BUILD_DIR
+pushd $ARROW_BUILD_DIR
+
+NPROC=$(nproc)
+
+cmake $ARROW_DIR/cpp \
+ -DARROW_BUILD_SHARED=OFF \
+ -DARROW_BUILD_STATIC=ON \
+ -DARROW_COMPUTE=ON \
+ -DARROW_CSV=ON \
+ -DARROW_DATASET=ON \
+ -DARROW_DEPENDENCY_SOURCE=${ARROW_DEPENDENCY_SOURCE} \
+ -DARROW_DEPENDENCY_USE_SHARED=OFF \
+ -DARROW_FILESYSTEM=ON \
+ -DARROW_HDFS=ON \
+ -DARROW_JEMALLOC=ON \
+ -DARROW_JSON=ON \
+ -DARROW_ORC=ON \
+ -DARROW_PARQUET=ON \
+ -DARROW_PLASMA=ON \
+ -DARROW_WITH_BROTLI=ON \
+ -DARROW_WITH_BZ2=ON \
+ -DARROW_WITH_LZ4=ON \
+ -DARROW_WITH_SNAPPY=ON \
+ -DARROW_WITH_ZLIB=ON \
+ -DARROW_WITH_ZSTD=ON \
+ -DORC_SOURCE=BUNDLED \
+ $ARROW_CMAKE_OPTIONS
+
+make -j$NPROC
+make install
+
+popd
+
+echo
+echo "=="
+echo "== CMake:"
+echo "== Building example project using Arrow C++ library"
+echo "=="
+echo
+
+rm -rf $EXAMPLE_BUILD_DIR
+mkdir -p $EXAMPLE_BUILD_DIR
+pushd $EXAMPLE_BUILD_DIR
+
+cmake $EXAMPLE_DIR -DARROW_LINK_SHARED=OFF
+make
+
+popd
+
+echo
+echo "=="
+echo "== CMake:"
+echo "== Running example project"
+echo "=="
+echo
+
+pushd $EXAMPLE_DIR
+
+$EXAMPLE_BUILD_DIR/arrow_example
+
+echo
+echo "=="
+echo "== pkg-config"
+echo "== Building example project using Arrow C++ library"
+echo "=="
+echo
+
+rm -rf $EXAMPLE_BUILD_DIR
+mkdir -p $EXAMPLE_BUILD_DIR
+${CXX:-c++} \
+ -o $EXAMPLE_BUILD_DIR/arrow_example \
+ $EXAMPLE_DIR/example.cc \
+ $(PKG_CONFIG_PATH=$ARROW_BUILD_DIR/lib/pkgconfig \
+ pkg-config --cflags --libs --static arrow)
+
+popd
+
+echo
+echo "=="
+echo "== pkg-config:"
+echo "== Running example project"
+echo "=="
+echo
+
+pushd $EXAMPLE_DIR
+
+$EXAMPLE_BUILD_DIR/arrow_example
diff --git a/src/arrow/cpp/examples/minimal_build/system_dependency.dockerfile b/src/arrow/cpp/examples/minimal_build/system_dependency.dockerfile
new file mode 100644
index 000000000..926fcaf6f
--- /dev/null
+++ b/src/arrow/cpp/examples/minimal_build/system_dependency.dockerfile
@@ -0,0 +1,44 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+FROM ubuntu:focal
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update -y -q && \
+ apt-get install -y -q --no-install-recommends \
+ build-essential \
+ cmake \
+ libboost-filesystem-dev \
+ libboost-regex-dev \
+ libboost-system-dev \
+ libbrotli-dev \
+ libbz2-dev \
+ libgflags-dev \
+ liblz4-dev \
+ libprotobuf-dev \
+ libprotoc-dev \
+ libre2-dev \
+ libsnappy-dev \
+ libthrift-dev \
+ libutf8proc-dev \
+ libzstd-dev \
+ pkg-config \
+ protobuf-compiler \
+ rapidjson-dev \
+ zlib1g-dev && \
+ apt-get clean && rm -rf /var/lib/apt/lists*
diff --git a/src/arrow/cpp/examples/minimal_build/test.csv b/src/arrow/cpp/examples/minimal_build/test.csv
new file mode 100644
index 000000000..ca2440852
--- /dev/null
+++ b/src/arrow/cpp/examples/minimal_build/test.csv
@@ -0,0 +1,3 @@
+Integers,Strings,Timestamps
+1,Some,2018-11-13 17:11:10
+2,data,N/A
diff --git a/src/arrow/cpp/examples/parquet/CMakeLists.txt b/src/arrow/cpp/examples/parquet/CMakeLists.txt
new file mode 100644
index 000000000..2d16948ae
--- /dev/null
+++ b/src/arrow/cpp/examples/parquet/CMakeLists.txt
@@ -0,0 +1,78 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+add_executable(parquet_low_level_example low_level_api/reader_writer.cc)
+add_executable(parquet_low_level_example2 low_level_api/reader_writer2.cc)
+add_executable(parquet_arrow_example parquet_arrow/reader_writer.cc)
+add_executable(parquet_stream_api_example parquet_stream_api/stream_reader_writer.cc)
+target_include_directories(parquet_low_level_example PRIVATE low_level_api/)
+target_include_directories(parquet_low_level_example2 PRIVATE low_level_api/)
+
+# The variables in these files are for illustration purposes
+set(PARQUET_EXAMPLES_WARNING_SUPPRESSIONS
+ low_level_api/reader_writer.cc
+ low_level_api/reader_writer2.cc)
+
+if (PARQUET_REQUIRE_ENCRYPTION)
+ add_executable(parquet_encryption_example low_level_api/encryption_reader_writer.cc)
+ add_executable(parquet_encryption_example_all_crypto_options low_level_api/encryption_reader_writer_all_crypto_options.cc)
+ target_include_directories(parquet_encryption_example PRIVATE low_level_api/)
+ target_include_directories(parquet_encryption_example_all_crypto_options PRIVATE low_level_api/)
+
+ set(PARQUET_EXAMPLES_WARNING_SUPPRESSIONS
+ ${PARQUET_EXAMPLES_WARNING_SUPPRESSIONS}
+ low_level_api/encryption_reader_writer.cc
+ low_level_api/encryption_reader_writer_all_crypto_options.cc)
+
+endif()
+
+if(UNIX)
+ foreach(FILE ${PARQUET_EXAMPLES_WARNING_SUPPRESSIONS})
+ set_property(SOURCE ${FILE}
+ APPEND_STRING
+ PROPERTY COMPILE_FLAGS "-Wno-unused-variable")
+ endforeach()
+endif()
+
+# Prefer shared linkage but use static if shared build is deactivated
+if (ARROW_BUILD_SHARED)
+ set(PARQUET_EXAMPLE_LINK_LIBS parquet_shared)
+else()
+ set(PARQUET_EXAMPLE_LINK_LIBS parquet_static)
+endif()
+
+target_link_libraries(parquet_arrow_example ${PARQUET_EXAMPLE_LINK_LIBS})
+target_link_libraries(parquet_low_level_example ${PARQUET_EXAMPLE_LINK_LIBS})
+target_link_libraries(parquet_low_level_example2 ${PARQUET_EXAMPLE_LINK_LIBS})
+target_link_libraries(parquet_stream_api_example ${PARQUET_EXAMPLE_LINK_LIBS})
+
+if(PARQUET_REQUIRE_ENCRYPTION)
+ target_link_libraries(parquet_encryption_example ${PARQUET_EXAMPLE_LINK_LIBS})
+ target_link_libraries(parquet_encryption_example_all_crypto_options ${PARQUET_EXAMPLE_LINK_LIBS})
+endif()
+
+add_dependencies(parquet
+ parquet_low_level_example
+ parquet_low_level_example2
+ parquet_arrow_example
+ parquet_stream_api_example)
+
+if (PARQUET_REQUIRE_ENCRYPTION)
+ add_dependencies(parquet
+ parquet_encryption_example
+ parquet_encryption_example_all_crypto_options)
+endif()
diff --git a/src/arrow/cpp/examples/parquet/low_level_api/encryption_reader_writer.cc b/src/arrow/cpp/examples/parquet/low_level_api/encryption_reader_writer.cc
new file mode 100644
index 000000000..75788b283
--- /dev/null
+++ b/src/arrow/cpp/examples/parquet/low_level_api/encryption_reader_writer.cc
@@ -0,0 +1,451 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#include <reader_writer.h>
+
+#include <cassert>
+#include <fstream>
+#include <iostream>
+#include <memory>
+
+/*
+ * This file contains sample for writing and reading encrypted Parquet file with
+ * basic encryption configuration.
+ *
+ * A detailed description of the Parquet Modular Encryption specification can be found
+ * here:
+ * https://github.com/apache/parquet-format/blob/encryption/Encryption.md
+ *
+ * The write sample creates a file with eight columns where two of the columns and the
+ * footer are encrypted.
+ *
+ * The read sample decrypts using key retriever that holds the keys of two encrypted
+ * columns and the footer key.
+ */
+
+constexpr int NUM_ROWS_PER_ROW_GROUP = 500;
+const char* PARQUET_FILENAME = "parquet_cpp_example.parquet.encrypted";
+const char* kFooterEncryptionKey = "0123456789012345"; // 128bit/16
+const char* kColumnEncryptionKey1 = "1234567890123450";
+const char* kColumnEncryptionKey2 = "1234567890123451";
+
+int main(int argc, char** argv) {
+ /**********************************************************************************
+ PARQUET ENCRYPTION WRITER EXAMPLE
+ **********************************************************************************/
+
+ try {
+ // Create a local file output stream instance.
+ using FileClass = ::arrow::io::FileOutputStream;
+ std::shared_ptr<FileClass> out_file;
+ PARQUET_ASSIGN_OR_THROW(out_file, FileClass::Open(PARQUET_FILENAME));
+
+ // Setup the parquet schema
+ std::shared_ptr<GroupNode> schema = SetupSchema();
+
+ // Add encryption properties
+ // Encryption configuration: Encrypt two columns and the footer.
+ std::map<std::string, std::shared_ptr<parquet::ColumnEncryptionProperties>>
+ encryption_cols;
+
+ parquet::SchemaDescriptor schema_desc;
+ schema_desc.Init(schema);
+ auto column_path1 = schema_desc.Column(5)->path()->ToDotString();
+ auto column_path2 = schema_desc.Column(4)->path()->ToDotString();
+
+ parquet::ColumnEncryptionProperties::Builder encryption_col_builder0(column_path1);
+ parquet::ColumnEncryptionProperties::Builder encryption_col_builder1(column_path2);
+ encryption_col_builder0.key(kColumnEncryptionKey1)->key_id("kc1");
+ encryption_col_builder1.key(kColumnEncryptionKey2)->key_id("kc2");
+
+ encryption_cols[column_path1] = encryption_col_builder0.build();
+ encryption_cols[column_path2] = encryption_col_builder1.build();
+
+ parquet::FileEncryptionProperties::Builder file_encryption_builder(
+ kFooterEncryptionKey);
+
+ parquet::WriterProperties::Builder builder;
+ // Add the current encryption configuration to WriterProperties.
+ builder.encryption(file_encryption_builder.footer_key_metadata("kf")
+ ->encrypted_columns(encryption_cols)
+ ->build());
+
+ // Add other writer properties
+ builder.compression(parquet::Compression::SNAPPY);
+
+ std::shared_ptr<parquet::WriterProperties> props = builder.build();
+
+ // Create a ParquetFileWriter instance
+ std::shared_ptr<parquet::ParquetFileWriter> file_writer =
+ parquet::ParquetFileWriter::Open(out_file, schema, props);
+
+ // Append a RowGroup with a specific number of rows.
+ parquet::RowGroupWriter* rg_writer = file_writer->AppendRowGroup();
+
+ // Write the Bool column
+ parquet::BoolWriter* bool_writer =
+ static_cast<parquet::BoolWriter*>(rg_writer->NextColumn());
+ for (int i = 0; i < NUM_ROWS_PER_ROW_GROUP; i++) {
+ bool value = ((i % 2) == 0) ? true : false;
+ bool_writer->WriteBatch(1, nullptr, nullptr, &value);
+ }
+
+ // Write the Int32 column
+ parquet::Int32Writer* int32_writer =
+ static_cast<parquet::Int32Writer*>(rg_writer->NextColumn());
+ for (int i = 0; i < NUM_ROWS_PER_ROW_GROUP; i++) {
+ int32_t value = i;
+ int32_writer->WriteBatch(1, nullptr, nullptr, &value);
+ }
+
+ // Write the Int64 column. Each row has repeats twice.
+ parquet::Int64Writer* int64_writer =
+ static_cast<parquet::Int64Writer*>(rg_writer->NextColumn());
+ for (int i = 0; i < 2 * NUM_ROWS_PER_ROW_GROUP; i++) {
+ int64_t value = i * 1000 * 1000;
+ value *= 1000 * 1000;
+ int16_t definition_level = 1;
+ int16_t repetition_level = 0;
+ if ((i % 2) == 0) {
+ repetition_level = 1; // start of a new record
+ }
+ int64_writer->WriteBatch(1, &definition_level, &repetition_level, &value);
+ }
+
+ // Write the INT96 column.
+ parquet::Int96Writer* int96_writer =
+ static_cast<parquet::Int96Writer*>(rg_writer->NextColumn());
+ for (int i = 0; i < NUM_ROWS_PER_ROW_GROUP; i++) {
+ parquet::Int96 value;
+ value.value[0] = i;
+ value.value[1] = i + 1;
+ value.value[2] = i + 2;
+ int96_writer->WriteBatch(1, nullptr, nullptr, &value);
+ }
+
+ // Write the Float column
+ parquet::FloatWriter* float_writer =
+ static_cast<parquet::FloatWriter*>(rg_writer->NextColumn());
+ for (int i = 0; i < NUM_ROWS_PER_ROW_GROUP; i++) {
+ float value = static_cast<float>(i) * 1.1f;
+ float_writer->WriteBatch(1, nullptr, nullptr, &value);
+ }
+
+ // Write the Double column
+ parquet::DoubleWriter* double_writer =
+ static_cast<parquet::DoubleWriter*>(rg_writer->NextColumn());
+ for (int i = 0; i < NUM_ROWS_PER_ROW_GROUP; i++) {
+ double value = i * 1.1111111;
+ double_writer->WriteBatch(1, nullptr, nullptr, &value);
+ }
+
+ // Write the ByteArray column. Make every alternate values NULL
+ parquet::ByteArrayWriter* ba_writer =
+ static_cast<parquet::ByteArrayWriter*>(rg_writer->NextColumn());
+ for (int i = 0; i < NUM_ROWS_PER_ROW_GROUP; i++) {
+ parquet::ByteArray value;
+ char hello[FIXED_LENGTH] = "parquet";
+ hello[7] = static_cast<char>(static_cast<int>('0') + i / 100);
+ hello[8] = static_cast<char>(static_cast<int>('0') + (i / 10) % 10);
+ hello[9] = static_cast<char>(static_cast<int>('0') + i % 10);
+ if (i % 2 == 0) {
+ int16_t definition_level = 1;
+ value.ptr = reinterpret_cast<const uint8_t*>(&hello[0]);
+ value.len = FIXED_LENGTH;
+ ba_writer->WriteBatch(1, &definition_level, nullptr, &value);
+ } else {
+ int16_t definition_level = 0;
+ ba_writer->WriteBatch(1, &definition_level, nullptr, nullptr);
+ }
+ }
+
+ // Write the FixedLengthByteArray column
+ parquet::FixedLenByteArrayWriter* flba_writer =
+ static_cast<parquet::FixedLenByteArrayWriter*>(rg_writer->NextColumn());
+ for (int i = 0; i < NUM_ROWS_PER_ROW_GROUP; i++) {
+ parquet::FixedLenByteArray value;
+ char v = static_cast<char>(i);
+ char flba[FIXED_LENGTH] = {v, v, v, v, v, v, v, v, v, v};
+ value.ptr = reinterpret_cast<const uint8_t*>(&flba[0]);
+
+ flba_writer->WriteBatch(1, nullptr, nullptr, &value);
+ }
+
+ // Close the ParquetFileWriter
+ file_writer->Close();
+
+ // Write the bytes to file
+ DCHECK(out_file->Close().ok());
+ } catch (const std::exception& e) {
+ std::cerr << "Parquet write error: " << e.what() << std::endl;
+ return -1;
+ }
+
+ /**********************************************************************************
+ PARQUET ENCRYPTION READER EXAMPLE
+ **********************************************************************************/
+
+ // Decryption configuration: Decrypt using key retriever callback that holds the keys
+ // of two encrypted columns and the footer key.
+ std::shared_ptr<parquet::StringKeyIdRetriever> string_kr1 =
+ std::make_shared<parquet::StringKeyIdRetriever>();
+ string_kr1->PutKey("kf", kFooterEncryptionKey);
+ string_kr1->PutKey("kc1", kColumnEncryptionKey1);
+ string_kr1->PutKey("kc2", kColumnEncryptionKey2);
+ std::shared_ptr<parquet::DecryptionKeyRetriever> kr1 =
+ std::static_pointer_cast<parquet::StringKeyIdRetriever>(string_kr1);
+
+ parquet::FileDecryptionProperties::Builder file_decryption_builder;
+
+ try {
+ parquet::ReaderProperties reader_properties = parquet::default_reader_properties();
+
+ // Add the current decryption configuration to ReaderProperties.
+ reader_properties.file_decryption_properties(
+ file_decryption_builder.key_retriever(kr1)->build());
+
+ // Create a ParquetReader instance
+ std::unique_ptr<parquet::ParquetFileReader> parquet_reader =
+ parquet::ParquetFileReader::OpenFile(PARQUET_FILENAME, false, reader_properties);
+
+ // Get the File MetaData
+ std::shared_ptr<parquet::FileMetaData> file_metadata = parquet_reader->metadata();
+
+ // Get the number of RowGroups
+ int num_row_groups = file_metadata->num_row_groups();
+ assert(num_row_groups == 1);
+
+ // Get the number of Columns
+ int num_columns = file_metadata->num_columns();
+ assert(num_columns == 8);
+
+ // Iterate over all the RowGroups in the file
+ for (int r = 0; r < num_row_groups; ++r) {
+ // Get the RowGroup Reader
+ std::shared_ptr<parquet::RowGroupReader> row_group_reader =
+ parquet_reader->RowGroup(r);
+
+ int64_t values_read = 0;
+ int64_t rows_read = 0;
+ int16_t definition_level;
+ int16_t repetition_level;
+ int i;
+ std::shared_ptr<parquet::ColumnReader> column_reader;
+
+ // Get the Column Reader for the boolean column
+ column_reader = row_group_reader->Column(0);
+ parquet::BoolReader* bool_reader =
+ static_cast<parquet::BoolReader*>(column_reader.get());
+
+ // Read all the rows in the column
+ i = 0;
+ while (bool_reader->HasNext()) {
+ bool value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = bool_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ bool expected_value = ((i % 2) == 0) ? true : false;
+ assert(value == expected_value);
+ i++;
+ }
+
+ // Get the Column Reader for the Int32 column
+ column_reader = row_group_reader->Column(1);
+ parquet::Int32Reader* int32_reader =
+ static_cast<parquet::Int32Reader*>(column_reader.get());
+ // Read all the rows in the column
+ i = 0;
+ while (int32_reader->HasNext()) {
+ int32_t value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = int32_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ assert(value == i);
+ i++;
+ }
+
+ // Get the Column Reader for the Int64 column
+ column_reader = row_group_reader->Column(2);
+ parquet::Int64Reader* int64_reader =
+ static_cast<parquet::Int64Reader*>(column_reader.get());
+ // Read all the rows in the column
+ i = 0;
+ while (int64_reader->HasNext()) {
+ int64_t value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = int64_reader->ReadBatch(1, &definition_level, &repetition_level,
+ &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ int64_t expected_value = i * 1000 * 1000;
+ expected_value *= 1000 * 1000;
+ assert(value == expected_value);
+ if ((i % 2) == 0) {
+ assert(repetition_level == 1);
+ } else {
+ assert(repetition_level == 0);
+ }
+ i++;
+ }
+
+ // Get the Column Reader for the Int96 column
+ column_reader = row_group_reader->Column(3);
+ parquet::Int96Reader* int96_reader =
+ static_cast<parquet::Int96Reader*>(column_reader.get());
+ // Read all the rows in the column
+ i = 0;
+ while (int96_reader->HasNext()) {
+ parquet::Int96 value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = int96_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ parquet::Int96 expected_value;
+ expected_value.value[0] = i;
+ expected_value.value[1] = i + 1;
+ expected_value.value[2] = i + 2;
+ for (int j = 0; j < 3; j++) {
+ assert(value.value[j] == expected_value.value[j]);
+ }
+ ARROW_UNUSED(expected_value); // suppress compiler warning in release builds
+ i++;
+ }
+
+ // Get the Column Reader for the Float column
+ column_reader = row_group_reader->Column(4);
+ parquet::FloatReader* float_reader =
+ static_cast<parquet::FloatReader*>(column_reader.get());
+ // Read all the rows in the column
+ i = 0;
+ while (float_reader->HasNext()) {
+ float value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = float_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ float expected_value = static_cast<float>(i) * 1.1f;
+ assert(value == expected_value);
+ i++;
+ }
+
+ // Get the Column Reader for the Double column
+ column_reader = row_group_reader->Column(5);
+ parquet::DoubleReader* double_reader =
+ static_cast<parquet::DoubleReader*>(column_reader.get());
+ // Read all the rows in the column
+ i = 0;
+ while (double_reader->HasNext()) {
+ double value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = double_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ double expected_value = i * 1.1111111;
+ assert(value == expected_value);
+ i++;
+ }
+
+ // Get the Column Reader for the ByteArray column
+ column_reader = row_group_reader->Column(6);
+ parquet::ByteArrayReader* ba_reader =
+ static_cast<parquet::ByteArrayReader*>(column_reader.get());
+ // Read all the rows in the column
+ i = 0;
+ while (ba_reader->HasNext()) {
+ parquet::ByteArray value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read =
+ ba_reader->ReadBatch(1, &definition_level, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ ARROW_UNUSED(rows_read); // suppress compiler warning in release builds
+ // Verify the value written
+ char expected_value[FIXED_LENGTH] = "parquet";
+ expected_value[7] = static_cast<char>('0' + i / 100);
+ expected_value[8] = static_cast<char>('0' + (i / 10) % 10);
+ expected_value[9] = static_cast<char>('0' + i % 10);
+ if (i % 2 == 0) { // only alternate values exist
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ assert(value.len == FIXED_LENGTH);
+ assert(memcmp(value.ptr, &expected_value[0], FIXED_LENGTH) == 0);
+ assert(definition_level == 1);
+ } else {
+ // There are NULL values in the rows written
+ assert(values_read == 0);
+ assert(definition_level == 0);
+ }
+ ARROW_UNUSED(expected_value); // suppress compiler warning in release builds
+ i++;
+ }
+
+ // Get the Column Reader for the FixedLengthByteArray column
+ column_reader = row_group_reader->Column(7);
+ parquet::FixedLenByteArrayReader* flba_reader =
+ static_cast<parquet::FixedLenByteArrayReader*>(column_reader.get());
+ // Read all the rows in the column
+ i = 0;
+ while (flba_reader->HasNext()) {
+ parquet::FixedLenByteArray value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = flba_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ char v = static_cast<char>(i);
+ char expected_value[FIXED_LENGTH] = {v, v, v, v, v, v, v, v, v, v};
+ assert(memcmp(value.ptr, &expected_value[0], FIXED_LENGTH) == 0);
+ i++;
+ }
+ }
+ } catch (const std::exception& e) {
+ std::cerr << "Parquet read error: " << e.what() << std::endl;
+ }
+
+ std::cout << "Parquet Writing and Reading Complete" << std::endl;
+ return 0;
+}
diff --git a/src/arrow/cpp/examples/parquet/low_level_api/encryption_reader_writer_all_crypto_options.cc b/src/arrow/cpp/examples/parquet/low_level_api/encryption_reader_writer_all_crypto_options.cc
new file mode 100644
index 000000000..5b01e0284
--- /dev/null
+++ b/src/arrow/cpp/examples/parquet/low_level_api/encryption_reader_writer_all_crypto_options.cc
@@ -0,0 +1,656 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#include <arrow/io/file.h>
+#include <arrow/util/logging.h>
+#include <dirent.h>
+#include <parquet/api/reader.h>
+#include <parquet/api/writer.h>
+
+#include <cassert>
+#include <fstream>
+#include <iostream>
+#include <memory>
+#include <regex>
+#include <sstream>
+
+/*
+ * This file contains samples for writing and reading encrypted Parquet files in different
+ * encryption and decryption configurations.
+ * Each sample section is dedicated to an independent configuration and shows its creation
+ * from beginning to end.
+ * The samples have the following goals:
+ * 1) Demonstrate usage of different options for data encryption and decryption.
+ * 2) Produce encrypted files for interoperability tests with other (eg parquet-mr)
+ * readers that support encryption.
+ * 3) Produce encrypted files with plaintext footer, for testing the ability of legacy
+ * readers to parse the footer and read unencrypted columns.
+ * 4) Perform interoperability tests with other (eg parquet-mr) writers, by reading
+ * encrypted files produced by these writers.
+ *
+ * Each write sample produces new independent parquet file, encrypted with a different
+ * encryption configuration as described below.
+ * The name of each file is in the form of:
+ * tester<encryption config number>.parquet.encrypted.
+ *
+ * The read sample creates a set of decryption configurations and then uses each of them
+ * to read all encrypted files in the input directory.
+ *
+ * The different encryption and decryption configurations are listed below.
+ *
+ * Usage: ./encryption-interop-tests <write/read> <path-to-directory-of-parquet-files>
+ *
+ * A detailed description of the Parquet Modular Encryption specification can be found
+ * here:
+ * https://github.com/apache/parquet-format/blob/encryption/Encryption.md
+ *
+ * The write sample creates files with four columns in the following
+ * encryption configurations:
+ *
+ * - Encryption configuration 1: Encrypt all columns and the footer with the same key.
+ * (uniform encryption)
+ * - Encryption configuration 2: Encrypt two columns and the footer, with different
+ * keys.
+ * - Encryption configuration 3: Encrypt two columns, with different keys.
+ * Don’t encrypt footer (to enable legacy readers)
+ * - plaintext footer mode.
+ * - Encryption configuration 4: Encrypt two columns and the footer, with different
+ * keys. Supply aad_prefix for file identity
+ * verification.
+ * - Encryption configuration 5: Encrypt two columns and the footer, with different
+ * keys. Supply aad_prefix, and call
+ * disable_aad_prefix_storage to prevent file
+ * identity storage in file metadata.
+ * - Encryption configuration 6: Encrypt two columns and the footer, with different
+ * keys. Use the alternative (AES_GCM_CTR_V1) algorithm.
+ *
+ * The read sample uses each of the following decryption configurations to read every
+ * encrypted files in the input directory:
+ *
+ * - Decryption configuration 1: Decrypt using key retriever that holds the keys of
+ * two encrypted columns and the footer key.
+ * - Decryption configuration 2: Decrypt using key retriever that holds the keys of
+ * two encrypted columns and the footer key. Supplies
+ * aad_prefix to verify file identity.
+ * - Decryption configuration 3: Decrypt using explicit column and footer keys
+ * (instead of key retrieval callback).
+ */
+
+constexpr int NUM_ROWS_PER_ROW_GROUP = 500;
+
+const char* kFooterEncryptionKey = "0123456789012345"; // 128bit/16
+const char* kColumnEncryptionKey1 = "1234567890123450";
+const char* kColumnEncryptionKey2 = "1234567890123451";
+const char* fileName = "tester";
+
+using FileClass = ::arrow::io::FileOutputStream;
+using parquet::ConvertedType;
+using parquet::Repetition;
+using parquet::Type;
+using parquet::schema::GroupNode;
+using parquet::schema::PrimitiveNode;
+
+void PrintDecryptionConfiguration(int configuration);
+// Check that the decryption result is as expected.
+void CheckResult(std::string file, int example_id, std::string exception_msg);
+// Returns true if FileName ends with suffix. Otherwise returns false.
+// Used to skip unencrypted parquet files.
+bool FileNameEndsWith(std::string file_name, std::string suffix);
+
+std::vector<std::string> GetDirectoryFiles(const std::string& path) {
+ std::vector<std::string> files;
+ struct dirent* entry;
+ DIR* dir = opendir(path.c_str());
+
+ if (dir == NULL) {
+ exit(-1);
+ }
+ while ((entry = readdir(dir)) != NULL) {
+ files.push_back(std::string(entry->d_name));
+ }
+ closedir(dir);
+ return files;
+}
+
+static std::shared_ptr<GroupNode> SetupSchema() {
+ parquet::schema::NodeVector fields;
+ // Create a primitive node named 'boolean_field' with type:BOOLEAN,
+ // repetition:REQUIRED
+ fields.push_back(PrimitiveNode::Make("boolean_field", Repetition::REQUIRED,
+ Type::BOOLEAN, ConvertedType::NONE));
+
+ // Create a primitive node named 'int32_field' with type:INT32, repetition:REQUIRED,
+ // logical type:TIME_MILLIS
+ fields.push_back(PrimitiveNode::Make("int32_field", Repetition::REQUIRED, Type::INT32,
+ ConvertedType::TIME_MILLIS));
+
+ fields.push_back(PrimitiveNode::Make("float_field", Repetition::REQUIRED, Type::FLOAT,
+ ConvertedType::NONE));
+
+ fields.push_back(PrimitiveNode::Make("double_field", Repetition::REQUIRED, Type::DOUBLE,
+ ConvertedType::NONE));
+
+ // Create a GroupNode named 'schema' using the primitive nodes defined above
+ // This GroupNode is the root node of the schema tree
+ return std::static_pointer_cast<GroupNode>(
+ GroupNode::Make("schema", Repetition::REQUIRED, fields));
+}
+
+void InteropTestWriteEncryptedParquetFiles(std::string root_path) {
+ /**********************************************************************************
+ Creating a number of Encryption configurations
+ **********************************************************************************/
+
+ // This vector will hold various encryption configurations.
+ std::vector<std::shared_ptr<parquet::FileEncryptionProperties>>
+ vector_of_encryption_configurations;
+
+ // Encryption configuration 1: Encrypt all columns and the footer with the same key.
+ // (uniform encryption)
+ parquet::FileEncryptionProperties::Builder file_encryption_builder_1(
+ kFooterEncryptionKey);
+ // Add to list of encryption configurations.
+ vector_of_encryption_configurations.push_back(
+ file_encryption_builder_1.footer_key_metadata("kf")->build());
+
+ // Encryption configuration 2: Encrypt two columns and the footer, with different keys.
+ std::map<std::string, std::shared_ptr<parquet::ColumnEncryptionProperties>>
+ encryption_cols2;
+ std::string path1 = "double_field";
+ std::string path2 = "float_field";
+ parquet::ColumnEncryptionProperties::Builder encryption_col_builder_20(path1);
+ parquet::ColumnEncryptionProperties::Builder encryption_col_builder_21(path2);
+ encryption_col_builder_20.key(kColumnEncryptionKey1)->key_id("kc1");
+ encryption_col_builder_21.key(kColumnEncryptionKey2)->key_id("kc2");
+
+ encryption_cols2[path1] = encryption_col_builder_20.build();
+ encryption_cols2[path2] = encryption_col_builder_21.build();
+
+ parquet::FileEncryptionProperties::Builder file_encryption_builder_2(
+ kFooterEncryptionKey);
+
+ vector_of_encryption_configurations.push_back(
+ file_encryption_builder_2.footer_key_metadata("kf")
+ ->encrypted_columns(encryption_cols2)
+ ->build());
+
+ // Encryption configuration 3: Encrypt two columns, with different keys.
+ // Don’t encrypt footer.
+ // (plaintext footer mode, readable by legacy readers)
+ std::map<std::string, std::shared_ptr<parquet::ColumnEncryptionProperties>>
+ encryption_cols3;
+ parquet::ColumnEncryptionProperties::Builder encryption_col_builder_30(path1);
+ parquet::ColumnEncryptionProperties::Builder encryption_col_builder_31(path2);
+ encryption_col_builder_30.key(kColumnEncryptionKey1)->key_id("kc1");
+ encryption_col_builder_31.key(kColumnEncryptionKey2)->key_id("kc2");
+
+ encryption_cols3[path1] = encryption_col_builder_30.build();
+ encryption_cols3[path2] = encryption_col_builder_31.build();
+ parquet::FileEncryptionProperties::Builder file_encryption_builder_3(
+ kFooterEncryptionKey);
+
+ vector_of_encryption_configurations.push_back(
+ file_encryption_builder_3.footer_key_metadata("kf")
+ ->encrypted_columns(encryption_cols3)
+ ->set_plaintext_footer()
+ ->build());
+
+ // Encryption configuration 4: Encrypt two columns and the footer, with different keys.
+ // Use aad_prefix.
+ std::map<std::string, std::shared_ptr<parquet::ColumnEncryptionProperties>>
+ encryption_cols4;
+ parquet::ColumnEncryptionProperties::Builder encryption_col_builder_40(path1);
+ parquet::ColumnEncryptionProperties::Builder encryption_col_builder_41(path2);
+ encryption_col_builder_40.key(kColumnEncryptionKey1)->key_id("kc1");
+ encryption_col_builder_41.key(kColumnEncryptionKey2)->key_id("kc2");
+
+ encryption_cols4[path1] = encryption_col_builder_40.build();
+ encryption_cols4[path2] = encryption_col_builder_41.build();
+ parquet::FileEncryptionProperties::Builder file_encryption_builder_4(
+ kFooterEncryptionKey);
+
+ vector_of_encryption_configurations.push_back(
+ file_encryption_builder_4.footer_key_metadata("kf")
+ ->encrypted_columns(encryption_cols4)
+ ->aad_prefix(fileName)
+ ->build());
+
+ // Encryption configuration 5: Encrypt two columns and the footer, with different keys.
+ // Use aad_prefix and disable_aad_prefix_storage.
+ std::map<std::string, std::shared_ptr<parquet::ColumnEncryptionProperties>>
+ encryption_cols5;
+ parquet::ColumnEncryptionProperties::Builder encryption_col_builder_50(path1);
+ parquet::ColumnEncryptionProperties::Builder encryption_col_builder_51(path2);
+ encryption_col_builder_50.key(kColumnEncryptionKey1)->key_id("kc1");
+ encryption_col_builder_51.key(kColumnEncryptionKey2)->key_id("kc2");
+
+ encryption_cols5[path1] = encryption_col_builder_50.build();
+ encryption_cols5[path2] = encryption_col_builder_51.build();
+ parquet::FileEncryptionProperties::Builder file_encryption_builder_5(
+ kFooterEncryptionKey);
+
+ vector_of_encryption_configurations.push_back(
+ file_encryption_builder_5.encrypted_columns(encryption_cols5)
+ ->footer_key_metadata("kf")
+ ->aad_prefix(fileName)
+ ->disable_aad_prefix_storage()
+ ->build());
+
+ // Encryption configuration 6: Encrypt two columns and the footer, with different keys.
+ // Use AES_GCM_CTR_V1 algorithm.
+ std::map<std::string, std::shared_ptr<parquet::ColumnEncryptionProperties>>
+ encryption_cols6;
+ parquet::ColumnEncryptionProperties::Builder encryption_col_builder_60(path1);
+ parquet::ColumnEncryptionProperties::Builder encryption_col_builder_61(path2);
+ encryption_col_builder_60.key(kColumnEncryptionKey1)->key_id("kc1");
+ encryption_col_builder_61.key(kColumnEncryptionKey2)->key_id("kc2");
+
+ encryption_cols6[path1] = encryption_col_builder_60.build();
+ encryption_cols6[path2] = encryption_col_builder_61.build();
+ parquet::FileEncryptionProperties::Builder file_encryption_builder_6(
+ kFooterEncryptionKey);
+
+ vector_of_encryption_configurations.push_back(
+ file_encryption_builder_6.footer_key_metadata("kf")
+ ->encrypted_columns(encryption_cols6)
+ ->algorithm(parquet::ParquetCipher::AES_GCM_CTR_V1)
+ ->build());
+
+ /**********************************************************************************
+ PARQUET WRITER EXAMPLE
+ **********************************************************************************/
+
+ // Iterate over the encryption configurations and for each one write a parquet file.
+ for (unsigned example_id = 0; example_id < vector_of_encryption_configurations.size();
+ ++example_id) {
+ std::stringstream ss;
+ ss << example_id + 1;
+ std::string test_number_string = ss.str();
+ try {
+ // Create a local file output stream instance.
+ std::shared_ptr<FileClass> out_file;
+ std::string file =
+ root_path + fileName + std::string(test_number_string) + ".parquet.encrypted";
+ std::cout << "Write " << file << std::endl;
+ PARQUET_ASSIGN_OR_THROW(out_file, FileClass::Open(file));
+
+ // Setup the parquet schema
+ std::shared_ptr<GroupNode> schema = SetupSchema();
+
+ // Add writer properties
+ parquet::WriterProperties::Builder builder;
+ builder.compression(parquet::Compression::SNAPPY);
+
+ // Add the current encryption configuration to WriterProperties.
+ builder.encryption(vector_of_encryption_configurations[example_id]);
+
+ std::shared_ptr<parquet::WriterProperties> props = builder.build();
+
+ // Create a ParquetFileWriter instance
+ std::shared_ptr<parquet::ParquetFileWriter> file_writer =
+ parquet::ParquetFileWriter::Open(out_file, schema, props);
+
+ // Append a RowGroup with a specific number of rows.
+ parquet::RowGroupWriter* rg_writer = file_writer->AppendRowGroup();
+
+ // Write the Bool column
+ parquet::BoolWriter* bool_writer =
+ static_cast<parquet::BoolWriter*>(rg_writer->NextColumn());
+ for (int i = 0; i < NUM_ROWS_PER_ROW_GROUP; i++) {
+ bool value = ((i % 2) == 0) ? true : false;
+ bool_writer->WriteBatch(1, nullptr, nullptr, &value);
+ }
+
+ // Write the Int32 column
+ parquet::Int32Writer* int32_writer =
+ static_cast<parquet::Int32Writer*>(rg_writer->NextColumn());
+ for (int i = 0; i < NUM_ROWS_PER_ROW_GROUP; i++) {
+ int32_t value = i;
+ int32_writer->WriteBatch(1, nullptr, nullptr, &value);
+ }
+
+ // Write the Float column
+ parquet::FloatWriter* float_writer =
+ static_cast<parquet::FloatWriter*>(rg_writer->NextColumn());
+ for (int i = 0; i < NUM_ROWS_PER_ROW_GROUP; i++) {
+ float value = static_cast<float>(i) * 1.1f;
+ float_writer->WriteBatch(1, nullptr, nullptr, &value);
+ }
+
+ // Write the Double column
+ parquet::DoubleWriter* double_writer =
+ static_cast<parquet::DoubleWriter*>(rg_writer->NextColumn());
+ for (int i = 0; i < NUM_ROWS_PER_ROW_GROUP; i++) {
+ double value = i * 1.1111111;
+ double_writer->WriteBatch(1, nullptr, nullptr, &value);
+ }
+ // Close the ParquetFileWriter
+ file_writer->Close();
+
+ // Write the bytes to file
+ DCHECK(out_file->Close().ok());
+ } catch (const std::exception& e) {
+ std::cerr << "Parquet write error: " << e.what() << std::endl;
+ return;
+ }
+ }
+}
+
+void InteropTestReadEncryptedParquetFiles(std::string root_path) {
+ std::vector<std::string> files_in_directory = GetDirectoryFiles(root_path);
+
+ /**********************************************************************************
+ Creating a number of Decryption configurations
+ **********************************************************************************/
+
+ // This vector will hold various decryption configurations.
+ std::vector<std::shared_ptr<parquet::FileDecryptionProperties>>
+ vector_of_decryption_configurations;
+
+ // Decryption configuration 1: Decrypt using key retriever callback that holds the keys
+ // of two encrypted columns and the footer key.
+ std::shared_ptr<parquet::StringKeyIdRetriever> string_kr1 =
+ std::make_shared<parquet::StringKeyIdRetriever>();
+ string_kr1->PutKey("kf", kFooterEncryptionKey);
+ string_kr1->PutKey("kc1", kColumnEncryptionKey1);
+ string_kr1->PutKey("kc2", kColumnEncryptionKey2);
+ std::shared_ptr<parquet::DecryptionKeyRetriever> kr1 =
+ std::static_pointer_cast<parquet::StringKeyIdRetriever>(string_kr1);
+
+ parquet::FileDecryptionProperties::Builder file_decryption_builder_1;
+ vector_of_decryption_configurations.push_back(
+ file_decryption_builder_1.key_retriever(kr1)->build());
+
+ // Decryption configuration 2: Decrypt using key retriever callback that holds the keys
+ // of two encrypted columns and the footer key. Supply aad_prefix.
+ std::shared_ptr<parquet::StringKeyIdRetriever> string_kr2 =
+ std::make_shared<parquet::StringKeyIdRetriever>();
+ string_kr2->PutKey("kf", kFooterEncryptionKey);
+ string_kr2->PutKey("kc1", kColumnEncryptionKey1);
+ string_kr2->PutKey("kc2", kColumnEncryptionKey2);
+ std::shared_ptr<parquet::DecryptionKeyRetriever> kr2 =
+ std::static_pointer_cast<parquet::StringKeyIdRetriever>(string_kr2);
+
+ parquet::FileDecryptionProperties::Builder file_decryption_builder_2;
+ vector_of_decryption_configurations.push_back(
+ file_decryption_builder_2.key_retriever(kr2)->aad_prefix(fileName)->build());
+
+ // Decryption configuration 3: Decrypt using explicit column and footer keys.
+ std::string path_double = "double_field";
+ std::string path_float = "float_field";
+ std::map<std::string, std::shared_ptr<parquet::ColumnDecryptionProperties>>
+ decryption_cols;
+ parquet::ColumnDecryptionProperties::Builder decryption_col_builder31(path_double);
+ parquet::ColumnDecryptionProperties::Builder decryption_col_builder32(path_float);
+
+ decryption_cols[path_double] =
+ decryption_col_builder31.key(kColumnEncryptionKey1)->build();
+ decryption_cols[path_float] =
+ decryption_col_builder32.key(kColumnEncryptionKey2)->build();
+
+ parquet::FileDecryptionProperties::Builder file_decryption_builder_3;
+ vector_of_decryption_configurations.push_back(
+ file_decryption_builder_3.footer_key(kFooterEncryptionKey)
+ ->column_keys(decryption_cols)
+ ->build());
+
+ /**********************************************************************************
+ PARQUET READER EXAMPLE
+ **********************************************************************************/
+
+ // Iterate over the decryption configurations and use each one to read every files
+ // in the input directory.
+ for (unsigned example_id = 0; example_id < vector_of_decryption_configurations.size();
+ ++example_id) {
+ PrintDecryptionConfiguration(example_id + 1);
+ for (auto const& file : files_in_directory) {
+ std::string exception_msg = "";
+ if (!FileNameEndsWith(file, "parquet.encrypted")) // Skip non encrypted files
+ continue;
+ try {
+ std::cout << "--> Read file " << file << std::endl;
+
+ parquet::ReaderProperties reader_properties =
+ parquet::default_reader_properties();
+
+ // Add the current decryption configuration to ReaderProperties.
+ reader_properties.file_decryption_properties(
+ vector_of_decryption_configurations[example_id]->DeepClone());
+
+ // Create a ParquetReader instance
+ std::unique_ptr<parquet::ParquetFileReader> parquet_reader =
+ parquet::ParquetFileReader::OpenFile(root_path + file, false,
+ reader_properties);
+
+ // Get the File MetaData
+ std::shared_ptr<parquet::FileMetaData> file_metadata = parquet_reader->metadata();
+
+ // Get the number of RowGroups
+ int num_row_groups = file_metadata->num_row_groups();
+ assert(num_row_groups == 1);
+
+ // Get the number of Columns
+ int num_columns = file_metadata->num_columns();
+ assert(num_columns == 4);
+
+ // Iterate over all the RowGroups in the file
+ for (int r = 0; r < num_row_groups; ++r) {
+ // Get the RowGroup Reader
+ std::shared_ptr<parquet::RowGroupReader> row_group_reader =
+ parquet_reader->RowGroup(r);
+
+ int64_t values_read = 0;
+ int64_t rows_read = 0;
+ int i;
+ std::shared_ptr<parquet::ColumnReader> column_reader;
+
+ // Get the Column Reader for the boolean column
+ column_reader = row_group_reader->Column(0);
+ parquet::BoolReader* bool_reader =
+ static_cast<parquet::BoolReader*>(column_reader.get());
+
+ // Read all the rows in the column
+ i = 0;
+ while (bool_reader->HasNext()) {
+ bool value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = bool_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ bool expected_value = ((i % 2) == 0) ? true : false;
+ assert(value == expected_value);
+ i++;
+ }
+ ARROW_UNUSED(rows_read); // suppress compiler warning in release builds
+
+ // Get the Column Reader for the Int32 column
+ column_reader = row_group_reader->Column(1);
+ parquet::Int32Reader* int32_reader =
+ static_cast<parquet::Int32Reader*>(column_reader.get());
+ // Read all the rows in the column
+ i = 0;
+ while (int32_reader->HasNext()) {
+ int32_t value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read =
+ int32_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ assert(value == i);
+ i++;
+ }
+
+ // Get the Column Reader for the Float column
+ column_reader = row_group_reader->Column(2);
+ parquet::FloatReader* float_reader =
+ static_cast<parquet::FloatReader*>(column_reader.get());
+ // Read all the rows in the column
+ i = 0;
+ while (float_reader->HasNext()) {
+ float value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read =
+ float_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ float expected_value = static_cast<float>(i) * 1.1f;
+ assert(value == expected_value);
+ i++;
+ }
+
+ // Get the Column Reader for the Double column
+ column_reader = row_group_reader->Column(3);
+ parquet::DoubleReader* double_reader =
+ static_cast<parquet::DoubleReader*>(column_reader.get());
+ // Read all the rows in the column
+ i = 0;
+ while (double_reader->HasNext()) {
+ double value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read =
+ double_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ double expected_value = i * 1.1111111;
+ assert(value == expected_value);
+ i++;
+ }
+ }
+ } catch (const std::exception& e) {
+ exception_msg = e.what();
+ }
+ CheckResult(file, example_id, exception_msg);
+ std::cout << "file [" << file << "] Parquet Reading Complete" << std::endl;
+ }
+ }
+}
+
+void PrintDecryptionConfiguration(int configuration) {
+ std::cout << "\n\nDecryption configuration ";
+ if (configuration == 1) {
+ std::cout << "1: \n\nDecrypt using key retriever that holds"
+ " the keys of two encrypted columns and the footer key."
+ << std::endl;
+ } else if (configuration == 2) {
+ std::cout << "2: \n\nDecrypt using key retriever that holds"
+ " the keys of two encrypted columns and the footer key. Pass aad_prefix."
+ << std::endl;
+ } else if (configuration == 3) {
+ std::cout << "3: \n\nDecrypt using explicit column and footer keys." << std::endl;
+ } else {
+ std::cout << "Unknown configuration" << std::endl;
+ exit(-1);
+ }
+ std::cout << std::endl;
+}
+
+// Check that the decryption result is as expected.
+void CheckResult(std::string file, int example_id, std::string exception_msg) {
+ int encryption_configuration_number;
+ std::regex r("tester([0-9]+)\\.parquet.encrypted");
+ std::smatch m;
+ std::regex_search(file, m, r);
+ if (m.size() == 0) {
+ std::cerr
+ << "Error: Error parsing filename to extract encryption configuration number. "
+ << std::endl;
+ }
+ std::string encryption_configuration_number_str = m.str(1);
+ encryption_configuration_number = atoi(encryption_configuration_number_str.c_str());
+ if (encryption_configuration_number < 1 || encryption_configuration_number > 6) {
+ std::cerr << "Error: Unknown encryption configuration number. " << std::endl;
+ }
+
+ int decryption_configuration_number = example_id + 1;
+
+ // Encryption_configuration number five contains aad_prefix and
+ // disable_aad_prefix_storage.
+ // An exception is expected to be thrown if the file is not decrypted with aad_prefix.
+ if (encryption_configuration_number == 5) {
+ if (decryption_configuration_number == 1 || decryption_configuration_number == 3) {
+ std::size_t found = exception_msg.find("AAD");
+ if (found == std::string::npos)
+ std::cout << "Error: Expecting AAD related exception.";
+ return;
+ }
+ }
+ // Decryption configuration number two contains aad_prefix. An exception is expected to
+ // be thrown if the file was not encrypted with the same aad_prefix.
+ if (decryption_configuration_number == 2) {
+ if (encryption_configuration_number != 5 && encryption_configuration_number != 4) {
+ std::size_t found = exception_msg.find("AAD");
+ if (found == std::string::npos) {
+ std::cout << "Error: Expecting AAD related exception." << std::endl;
+ }
+ return;
+ }
+ }
+ if (!exception_msg.empty())
+ std::cout << "Error: Unexpected exception was thrown." << exception_msg;
+}
+
+bool FileNameEndsWith(std::string file_name, std::string suffix) {
+ std::string::size_type idx = file_name.find_first_of('.');
+
+ if (idx != std::string::npos) {
+ std::string extension = file_name.substr(idx + 1);
+ if (extension.compare(suffix) == 0) return true;
+ }
+ return false;
+}
+
+int main(int argc, char** argv) {
+ enum Operation { write, read };
+ std::string root_path;
+ Operation operation = write;
+ if (argc < 3) {
+ std::cout << "Usage: encryption-reader-writer-all-crypto-options <read/write> "
+ "<Path-to-parquet-files>"
+ << std::endl;
+ exit(1);
+ }
+ root_path = argv[1];
+ if (root_path.compare("read") == 0) {
+ operation = read;
+ }
+
+ root_path = argv[2];
+ std::cout << "Root path is: " << root_path << std::endl;
+
+ if (operation == write) {
+ InteropTestWriteEncryptedParquetFiles(root_path);
+ } else {
+ InteropTestReadEncryptedParquetFiles(root_path);
+ }
+ return 0;
+}
diff --git a/src/arrow/cpp/examples/parquet/low_level_api/reader_writer.cc b/src/arrow/cpp/examples/parquet/low_level_api/reader_writer.cc
new file mode 100644
index 000000000..09af32289
--- /dev/null
+++ b/src/arrow/cpp/examples/parquet/low_level_api/reader_writer.cc
@@ -0,0 +1,413 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#include <reader_writer.h>
+
+#include <cassert>
+#include <fstream>
+#include <iostream>
+#include <memory>
+
+/*
+ * This example describes writing and reading Parquet Files in C++ and serves as a
+ * reference to the API.
+ * The file contains all the physical data types supported by Parquet.
+ * This example uses the RowGroupWriter API that supports writing RowGroups optimized for
+ * memory consumption.
+ **/
+
+/* Parquet is a structured columnar file format
+ * Parquet File = "Parquet data" + "Parquet Metadata"
+ * "Parquet data" is simply a vector of RowGroups. Each RowGroup is a batch of rows in a
+ * columnar layout
+ * "Parquet Metadata" contains the "file schema" and attributes of the RowGroups and their
+ * Columns
+ * "file schema" is a tree where each node is either a primitive type (leaf nodes) or a
+ * complex (nested) type (internal nodes)
+ * For specific details, please refer the format here:
+ * https://github.com/apache/parquet-format/blob/master/LogicalTypes.md
+ **/
+
+constexpr int NUM_ROWS_PER_ROW_GROUP = 500;
+const char PARQUET_FILENAME[] = "parquet_cpp_example.parquet";
+
+int main(int argc, char** argv) {
+ /**********************************************************************************
+ PARQUET WRITER EXAMPLE
+ **********************************************************************************/
+ // parquet::REQUIRED fields do not need definition and repetition level values
+ // parquet::OPTIONAL fields require only definition level values
+ // parquet::REPEATED fields require both definition and repetition level values
+ try {
+ // Create a local file output stream instance.
+ using FileClass = ::arrow::io::FileOutputStream;
+ std::shared_ptr<FileClass> out_file;
+ PARQUET_ASSIGN_OR_THROW(out_file, FileClass::Open(PARQUET_FILENAME));
+
+ // Setup the parquet schema
+ std::shared_ptr<GroupNode> schema = SetupSchema();
+
+ // Add writer properties
+ parquet::WriterProperties::Builder builder;
+ builder.compression(parquet::Compression::SNAPPY);
+ std::shared_ptr<parquet::WriterProperties> props = builder.build();
+
+ // Create a ParquetFileWriter instance
+ std::shared_ptr<parquet::ParquetFileWriter> file_writer =
+ parquet::ParquetFileWriter::Open(out_file, schema, props);
+
+ // Append a RowGroup with a specific number of rows.
+ parquet::RowGroupWriter* rg_writer = file_writer->AppendRowGroup();
+
+ // Write the Bool column
+ parquet::BoolWriter* bool_writer =
+ static_cast<parquet::BoolWriter*>(rg_writer->NextColumn());
+ for (int i = 0; i < NUM_ROWS_PER_ROW_GROUP; i++) {
+ bool value = ((i % 2) == 0) ? true : false;
+ bool_writer->WriteBatch(1, nullptr, nullptr, &value);
+ }
+
+ // Write the Int32 column
+ parquet::Int32Writer* int32_writer =
+ static_cast<parquet::Int32Writer*>(rg_writer->NextColumn());
+ for (int i = 0; i < NUM_ROWS_PER_ROW_GROUP; i++) {
+ int32_t value = i;
+ int32_writer->WriteBatch(1, nullptr, nullptr, &value);
+ }
+
+ // Write the Int64 column. Each row has repeats twice.
+ parquet::Int64Writer* int64_writer =
+ static_cast<parquet::Int64Writer*>(rg_writer->NextColumn());
+ for (int i = 0; i < 2 * NUM_ROWS_PER_ROW_GROUP; i++) {
+ int64_t value = i * 1000 * 1000;
+ value *= 1000 * 1000;
+ int16_t definition_level = 1;
+ int16_t repetition_level = 0;
+ if ((i % 2) == 0) {
+ repetition_level = 1; // start of a new record
+ }
+ int64_writer->WriteBatch(1, &definition_level, &repetition_level, &value);
+ }
+
+ // Write the INT96 column.
+ parquet::Int96Writer* int96_writer =
+ static_cast<parquet::Int96Writer*>(rg_writer->NextColumn());
+ for (int i = 0; i < NUM_ROWS_PER_ROW_GROUP; i++) {
+ parquet::Int96 value;
+ value.value[0] = i;
+ value.value[1] = i + 1;
+ value.value[2] = i + 2;
+ int96_writer->WriteBatch(1, nullptr, nullptr, &value);
+ }
+
+ // Write the Float column
+ parquet::FloatWriter* float_writer =
+ static_cast<parquet::FloatWriter*>(rg_writer->NextColumn());
+ for (int i = 0; i < NUM_ROWS_PER_ROW_GROUP; i++) {
+ float value = static_cast<float>(i) * 1.1f;
+ float_writer->WriteBatch(1, nullptr, nullptr, &value);
+ }
+
+ // Write the Double column
+ parquet::DoubleWriter* double_writer =
+ static_cast<parquet::DoubleWriter*>(rg_writer->NextColumn());
+ for (int i = 0; i < NUM_ROWS_PER_ROW_GROUP; i++) {
+ double value = i * 1.1111111;
+ double_writer->WriteBatch(1, nullptr, nullptr, &value);
+ }
+
+ // Write the ByteArray column. Make every alternate values NULL
+ parquet::ByteArrayWriter* ba_writer =
+ static_cast<parquet::ByteArrayWriter*>(rg_writer->NextColumn());
+ for (int i = 0; i < NUM_ROWS_PER_ROW_GROUP; i++) {
+ parquet::ByteArray value;
+ char hello[FIXED_LENGTH] = "parquet";
+ hello[7] = static_cast<char>(static_cast<int>('0') + i / 100);
+ hello[8] = static_cast<char>(static_cast<int>('0') + (i / 10) % 10);
+ hello[9] = static_cast<char>(static_cast<int>('0') + i % 10);
+ if (i % 2 == 0) {
+ int16_t definition_level = 1;
+ value.ptr = reinterpret_cast<const uint8_t*>(&hello[0]);
+ value.len = FIXED_LENGTH;
+ ba_writer->WriteBatch(1, &definition_level, nullptr, &value);
+ } else {
+ int16_t definition_level = 0;
+ ba_writer->WriteBatch(1, &definition_level, nullptr, nullptr);
+ }
+ }
+
+ // Write the FixedLengthByteArray column
+ parquet::FixedLenByteArrayWriter* flba_writer =
+ static_cast<parquet::FixedLenByteArrayWriter*>(rg_writer->NextColumn());
+ for (int i = 0; i < NUM_ROWS_PER_ROW_GROUP; i++) {
+ parquet::FixedLenByteArray value;
+ char v = static_cast<char>(i);
+ char flba[FIXED_LENGTH] = {v, v, v, v, v, v, v, v, v, v};
+ value.ptr = reinterpret_cast<const uint8_t*>(&flba[0]);
+
+ flba_writer->WriteBatch(1, nullptr, nullptr, &value);
+ }
+
+ // Close the ParquetFileWriter
+ file_writer->Close();
+
+ // Write the bytes to file
+ DCHECK(out_file->Close().ok());
+ } catch (const std::exception& e) {
+ std::cerr << "Parquet write error: " << e.what() << std::endl;
+ return -1;
+ }
+
+ /**********************************************************************************
+ PARQUET READER EXAMPLE
+ **********************************************************************************/
+
+ try {
+ // Create a ParquetReader instance
+ std::unique_ptr<parquet::ParquetFileReader> parquet_reader =
+ parquet::ParquetFileReader::OpenFile(PARQUET_FILENAME, false);
+
+ // Get the File MetaData
+ std::shared_ptr<parquet::FileMetaData> file_metadata = parquet_reader->metadata();
+
+ // Get the number of RowGroups
+ int num_row_groups = file_metadata->num_row_groups();
+ assert(num_row_groups == 1);
+
+ // Get the number of Columns
+ int num_columns = file_metadata->num_columns();
+ assert(num_columns == 8);
+
+ // Iterate over all the RowGroups in the file
+ for (int r = 0; r < num_row_groups; ++r) {
+ // Get the RowGroup Reader
+ std::shared_ptr<parquet::RowGroupReader> row_group_reader =
+ parquet_reader->RowGroup(r);
+
+ int64_t values_read = 0;
+ int64_t rows_read = 0;
+ int16_t definition_level;
+ int16_t repetition_level;
+ int i;
+ std::shared_ptr<parquet::ColumnReader> column_reader;
+
+ ARROW_UNUSED(rows_read); // prevent warning in release build
+
+ // Get the Column Reader for the boolean column
+ column_reader = row_group_reader->Column(0);
+ parquet::BoolReader* bool_reader =
+ static_cast<parquet::BoolReader*>(column_reader.get());
+
+ // Read all the rows in the column
+ i = 0;
+ while (bool_reader->HasNext()) {
+ bool value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = bool_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ bool expected_value = ((i % 2) == 0) ? true : false;
+ assert(value == expected_value);
+ i++;
+ }
+
+ // Get the Column Reader for the Int32 column
+ column_reader = row_group_reader->Column(1);
+ parquet::Int32Reader* int32_reader =
+ static_cast<parquet::Int32Reader*>(column_reader.get());
+ // Read all the rows in the column
+ i = 0;
+ while (int32_reader->HasNext()) {
+ int32_t value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = int32_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ assert(value == i);
+ i++;
+ }
+
+ // Get the Column Reader for the Int64 column
+ column_reader = row_group_reader->Column(2);
+ parquet::Int64Reader* int64_reader =
+ static_cast<parquet::Int64Reader*>(column_reader.get());
+ // Read all the rows in the column
+ i = 0;
+ while (int64_reader->HasNext()) {
+ int64_t value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = int64_reader->ReadBatch(1, &definition_level, &repetition_level,
+ &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ int64_t expected_value = i * 1000 * 1000;
+ expected_value *= 1000 * 1000;
+ assert(value == expected_value);
+ if ((i % 2) == 0) {
+ assert(repetition_level == 1);
+ } else {
+ assert(repetition_level == 0);
+ }
+ i++;
+ }
+
+ // Get the Column Reader for the Int96 column
+ column_reader = row_group_reader->Column(3);
+ parquet::Int96Reader* int96_reader =
+ static_cast<parquet::Int96Reader*>(column_reader.get());
+ // Read all the rows in the column
+ i = 0;
+ while (int96_reader->HasNext()) {
+ parquet::Int96 value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = int96_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ parquet::Int96 expected_value;
+ ARROW_UNUSED(expected_value); // prevent warning in release build
+ expected_value.value[0] = i;
+ expected_value.value[1] = i + 1;
+ expected_value.value[2] = i + 2;
+ for (int j = 0; j < 3; j++) {
+ assert(value.value[j] == expected_value.value[j]);
+ }
+ i++;
+ }
+
+ // Get the Column Reader for the Float column
+ column_reader = row_group_reader->Column(4);
+ parquet::FloatReader* float_reader =
+ static_cast<parquet::FloatReader*>(column_reader.get());
+ // Read all the rows in the column
+ i = 0;
+ while (float_reader->HasNext()) {
+ float value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = float_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ float expected_value = static_cast<float>(i) * 1.1f;
+ assert(value == expected_value);
+ i++;
+ }
+
+ // Get the Column Reader for the Double column
+ column_reader = row_group_reader->Column(5);
+ parquet::DoubleReader* double_reader =
+ static_cast<parquet::DoubleReader*>(column_reader.get());
+ // Read all the rows in the column
+ i = 0;
+ while (double_reader->HasNext()) {
+ double value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = double_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ double expected_value = i * 1.1111111;
+ assert(value == expected_value);
+ i++;
+ }
+
+ // Get the Column Reader for the ByteArray column
+ column_reader = row_group_reader->Column(6);
+ parquet::ByteArrayReader* ba_reader =
+ static_cast<parquet::ByteArrayReader*>(column_reader.get());
+ // Read all the rows in the column
+ i = 0;
+ while (ba_reader->HasNext()) {
+ parquet::ByteArray value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read =
+ ba_reader->ReadBatch(1, &definition_level, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // Verify the value written
+ char expected_value[FIXED_LENGTH] = "parquet";
+ ARROW_UNUSED(expected_value); // prevent warning in release build
+ expected_value[7] = static_cast<char>('0' + i / 100);
+ expected_value[8] = static_cast<char>('0' + (i / 10) % 10);
+ expected_value[9] = static_cast<char>('0' + i % 10);
+ if (i % 2 == 0) { // only alternate values exist
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ assert(value.len == FIXED_LENGTH);
+ assert(memcmp(value.ptr, &expected_value[0], FIXED_LENGTH) == 0);
+ assert(definition_level == 1);
+ } else {
+ // There are NULL values in the rows written
+ assert(values_read == 0);
+ assert(definition_level == 0);
+ }
+ i++;
+ }
+
+ // Get the Column Reader for the FixedLengthByteArray column
+ column_reader = row_group_reader->Column(7);
+ parquet::FixedLenByteArrayReader* flba_reader =
+ static_cast<parquet::FixedLenByteArrayReader*>(column_reader.get());
+ // Read all the rows in the column
+ i = 0;
+ while (flba_reader->HasNext()) {
+ parquet::FixedLenByteArray value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = flba_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ char v = static_cast<char>(i);
+ char expected_value[FIXED_LENGTH] = {v, v, v, v, v, v, v, v, v, v};
+ assert(memcmp(value.ptr, &expected_value[0], FIXED_LENGTH) == 0);
+ i++;
+ }
+ }
+ } catch (const std::exception& e) {
+ std::cerr << "Parquet read error: " << e.what() << std::endl;
+ return -1;
+ }
+
+ std::cout << "Parquet Writing and Reading Complete" << std::endl;
+
+ return 0;
+}
diff --git a/src/arrow/cpp/examples/parquet/low_level_api/reader_writer.h b/src/arrow/cpp/examples/parquet/low_level_api/reader_writer.h
new file mode 100644
index 000000000..ed8e74653
--- /dev/null
+++ b/src/arrow/cpp/examples/parquet/low_level_api/reader_writer.h
@@ -0,0 +1,70 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#include <arrow/io/file.h>
+#include <arrow/util/logging.h>
+#include <parquet/api/reader.h>
+#include <parquet/api/writer.h>
+
+using parquet::ConvertedType;
+using parquet::Repetition;
+using parquet::Type;
+using parquet::schema::GroupNode;
+using parquet::schema::PrimitiveNode;
+
+constexpr int FIXED_LENGTH = 10;
+
+static std::shared_ptr<GroupNode> SetupSchema() {
+ parquet::schema::NodeVector fields;
+ // Create a primitive node named 'boolean_field' with type:BOOLEAN,
+ // repetition:REQUIRED
+ fields.push_back(PrimitiveNode::Make("boolean_field", Repetition::REQUIRED,
+ Type::BOOLEAN, ConvertedType::NONE));
+
+ // Create a primitive node named 'int32_field' with type:INT32, repetition:REQUIRED,
+ // logical type:TIME_MILLIS
+ fields.push_back(PrimitiveNode::Make("int32_field", Repetition::REQUIRED, Type::INT32,
+ ConvertedType::TIME_MILLIS));
+
+ // Create a primitive node named 'int64_field' with type:INT64, repetition:REPEATED
+ fields.push_back(PrimitiveNode::Make("int64_field", Repetition::REPEATED, Type::INT64,
+ ConvertedType::NONE));
+
+ fields.push_back(PrimitiveNode::Make("int96_field", Repetition::REQUIRED, Type::INT96,
+ ConvertedType::NONE));
+
+ fields.push_back(PrimitiveNode::Make("float_field", Repetition::REQUIRED, Type::FLOAT,
+ ConvertedType::NONE));
+
+ fields.push_back(PrimitiveNode::Make("double_field", Repetition::REQUIRED, Type::DOUBLE,
+ ConvertedType::NONE));
+
+ // Create a primitive node named 'ba_field' with type:BYTE_ARRAY, repetition:OPTIONAL
+ fields.push_back(PrimitiveNode::Make("ba_field", Repetition::OPTIONAL, Type::BYTE_ARRAY,
+ ConvertedType::NONE));
+
+ // Create a primitive node named 'flba_field' with type:FIXED_LEN_BYTE_ARRAY,
+ // repetition:REQUIRED, field_length = FIXED_LENGTH
+ fields.push_back(PrimitiveNode::Make("flba_field", Repetition::REQUIRED,
+ Type::FIXED_LEN_BYTE_ARRAY, ConvertedType::NONE,
+ FIXED_LENGTH));
+
+ // Create a GroupNode named 'schema' using the primitive nodes defined above
+ // This GroupNode is the root node of the schema tree
+ return std::static_pointer_cast<GroupNode>(
+ GroupNode::Make("schema", Repetition::REQUIRED, fields));
+}
diff --git a/src/arrow/cpp/examples/parquet/low_level_api/reader_writer2.cc b/src/arrow/cpp/examples/parquet/low_level_api/reader_writer2.cc
new file mode 100644
index 000000000..65dd5799e
--- /dev/null
+++ b/src/arrow/cpp/examples/parquet/low_level_api/reader_writer2.cc
@@ -0,0 +1,434 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#include <reader_writer.h>
+
+#include <cassert>
+#include <fstream>
+#include <iostream>
+#include <memory>
+
+/*
+ * This example describes writing and reading Parquet Files in C++ and serves as a
+ * reference to the API.
+ * The file contains all the physical data types supported by Parquet.
+ * This example uses the RowGroupWriter API that supports writing RowGroups based on a
+ * certain size.
+ **/
+
+/* Parquet is a structured columnar file format
+ * Parquet File = "Parquet data" + "Parquet Metadata"
+ * "Parquet data" is simply a vector of RowGroups. Each RowGroup is a batch of rows in a
+ * columnar layout
+ * "Parquet Metadata" contains the "file schema" and attributes of the RowGroups and their
+ * Columns
+ * "file schema" is a tree where each node is either a primitive type (leaf nodes) or a
+ * complex (nested) type (internal nodes)
+ * For specific details, please refer the format here:
+ * https://github.com/apache/parquet-format/blob/master/LogicalTypes.md
+ **/
+
+constexpr int NUM_ROWS = 2500000;
+constexpr int64_t ROW_GROUP_SIZE = 16 * 1024 * 1024; // 16 MB
+const char PARQUET_FILENAME[] = "parquet_cpp_example2.parquet";
+
+int main(int argc, char** argv) {
+ /**********************************************************************************
+ PARQUET WRITER EXAMPLE
+ **********************************************************************************/
+ // parquet::REQUIRED fields do not need definition and repetition level values
+ // parquet::OPTIONAL fields require only definition level values
+ // parquet::REPEATED fields require both definition and repetition level values
+ try {
+ // Create a local file output stream instance.
+ using FileClass = ::arrow::io::FileOutputStream;
+ std::shared_ptr<FileClass> out_file;
+ PARQUET_ASSIGN_OR_THROW(out_file, FileClass::Open(PARQUET_FILENAME));
+
+ // Setup the parquet schema
+ std::shared_ptr<GroupNode> schema = SetupSchema();
+
+ // Add writer properties
+ parquet::WriterProperties::Builder builder;
+ builder.compression(parquet::Compression::SNAPPY);
+ std::shared_ptr<parquet::WriterProperties> props = builder.build();
+
+ // Create a ParquetFileWriter instance
+ std::shared_ptr<parquet::ParquetFileWriter> file_writer =
+ parquet::ParquetFileWriter::Open(out_file, schema, props);
+
+ // Append a BufferedRowGroup to keep the RowGroup open until a certain size
+ parquet::RowGroupWriter* rg_writer = file_writer->AppendBufferedRowGroup();
+
+ int num_columns = file_writer->num_columns();
+ std::vector<int64_t> buffered_values_estimate(num_columns, 0);
+ for (int i = 0; i < NUM_ROWS; i++) {
+ int64_t estimated_bytes = 0;
+ // Get the estimated size of the values that are not written to a page yet
+ for (int n = 0; n < num_columns; n++) {
+ estimated_bytes += buffered_values_estimate[n];
+ }
+
+ // We need to consider the compressed pages
+ // as well as the values that are not compressed yet
+ if ((rg_writer->total_bytes_written() + rg_writer->total_compressed_bytes() +
+ estimated_bytes) > ROW_GROUP_SIZE) {
+ rg_writer->Close();
+ std::fill(buffered_values_estimate.begin(), buffered_values_estimate.end(), 0);
+ rg_writer = file_writer->AppendBufferedRowGroup();
+ }
+
+ int col_id = 0;
+ // Write the Bool column
+ parquet::BoolWriter* bool_writer =
+ static_cast<parquet::BoolWriter*>(rg_writer->column(col_id));
+ bool bool_value = ((i % 2) == 0) ? true : false;
+ bool_writer->WriteBatch(1, nullptr, nullptr, &bool_value);
+ buffered_values_estimate[col_id] = bool_writer->EstimatedBufferedValueBytes();
+
+ // Write the Int32 column
+ col_id++;
+ parquet::Int32Writer* int32_writer =
+ static_cast<parquet::Int32Writer*>(rg_writer->column(col_id));
+ int32_t int32_value = i;
+ int32_writer->WriteBatch(1, nullptr, nullptr, &int32_value);
+ buffered_values_estimate[col_id] = int32_writer->EstimatedBufferedValueBytes();
+
+ // Write the Int64 column. Each row has repeats twice.
+ col_id++;
+ parquet::Int64Writer* int64_writer =
+ static_cast<parquet::Int64Writer*>(rg_writer->column(col_id));
+ int64_t int64_value1 = 2 * i;
+ int16_t definition_level = 1;
+ int16_t repetition_level = 0;
+ int64_writer->WriteBatch(1, &definition_level, &repetition_level, &int64_value1);
+ int64_t int64_value2 = (2 * i + 1);
+ repetition_level = 1; // start of a new record
+ int64_writer->WriteBatch(1, &definition_level, &repetition_level, &int64_value2);
+ buffered_values_estimate[col_id] = int64_writer->EstimatedBufferedValueBytes();
+
+ // Write the INT96 column.
+ col_id++;
+ parquet::Int96Writer* int96_writer =
+ static_cast<parquet::Int96Writer*>(rg_writer->column(col_id));
+ parquet::Int96 int96_value;
+ int96_value.value[0] = i;
+ int96_value.value[1] = i + 1;
+ int96_value.value[2] = i + 2;
+ int96_writer->WriteBatch(1, nullptr, nullptr, &int96_value);
+ buffered_values_estimate[col_id] = int96_writer->EstimatedBufferedValueBytes();
+
+ // Write the Float column
+ col_id++;
+ parquet::FloatWriter* float_writer =
+ static_cast<parquet::FloatWriter*>(rg_writer->column(col_id));
+ float float_value = static_cast<float>(i) * 1.1f;
+ float_writer->WriteBatch(1, nullptr, nullptr, &float_value);
+ buffered_values_estimate[col_id] = float_writer->EstimatedBufferedValueBytes();
+
+ // Write the Double column
+ col_id++;
+ parquet::DoubleWriter* double_writer =
+ static_cast<parquet::DoubleWriter*>(rg_writer->column(col_id));
+ double double_value = i * 1.1111111;
+ double_writer->WriteBatch(1, nullptr, nullptr, &double_value);
+ buffered_values_estimate[col_id] = double_writer->EstimatedBufferedValueBytes();
+
+ // Write the ByteArray column. Make every alternate values NULL
+ col_id++;
+ parquet::ByteArrayWriter* ba_writer =
+ static_cast<parquet::ByteArrayWriter*>(rg_writer->column(col_id));
+ parquet::ByteArray ba_value;
+ char hello[FIXED_LENGTH] = "parquet";
+ hello[7] = static_cast<char>(static_cast<int>('0') + i / 100);
+ hello[8] = static_cast<char>(static_cast<int>('0') + (i / 10) % 10);
+ hello[9] = static_cast<char>(static_cast<int>('0') + i % 10);
+ if (i % 2 == 0) {
+ int16_t definition_level = 1;
+ ba_value.ptr = reinterpret_cast<const uint8_t*>(&hello[0]);
+ ba_value.len = FIXED_LENGTH;
+ ba_writer->WriteBatch(1, &definition_level, nullptr, &ba_value);
+ } else {
+ int16_t definition_level = 0;
+ ba_writer->WriteBatch(1, &definition_level, nullptr, nullptr);
+ }
+ buffered_values_estimate[col_id] = ba_writer->EstimatedBufferedValueBytes();
+
+ // Write the FixedLengthByteArray column
+ col_id++;
+ parquet::FixedLenByteArrayWriter* flba_writer =
+ static_cast<parquet::FixedLenByteArrayWriter*>(rg_writer->column(col_id));
+ parquet::FixedLenByteArray flba_value;
+ char v = static_cast<char>(i);
+ char flba[FIXED_LENGTH] = {v, v, v, v, v, v, v, v, v, v};
+ flba_value.ptr = reinterpret_cast<const uint8_t*>(&flba[0]);
+
+ flba_writer->WriteBatch(1, nullptr, nullptr, &flba_value);
+ buffered_values_estimate[col_id] = flba_writer->EstimatedBufferedValueBytes();
+ }
+
+ // Close the RowGroupWriter
+ rg_writer->Close();
+ // Close the ParquetFileWriter
+ file_writer->Close();
+
+ // Write the bytes to file
+ DCHECK(out_file->Close().ok());
+ } catch (const std::exception& e) {
+ std::cerr << "Parquet write error: " << e.what() << std::endl;
+ return -1;
+ }
+
+ /**********************************************************************************
+ PARQUET READER EXAMPLE
+ **********************************************************************************/
+
+ try {
+ // Create a ParquetReader instance
+ std::unique_ptr<parquet::ParquetFileReader> parquet_reader =
+ parquet::ParquetFileReader::OpenFile(PARQUET_FILENAME, false);
+
+ // Get the File MetaData
+ std::shared_ptr<parquet::FileMetaData> file_metadata = parquet_reader->metadata();
+
+ int num_row_groups = file_metadata->num_row_groups();
+
+ // Get the number of Columns
+ int num_columns = file_metadata->num_columns();
+ assert(num_columns == 8);
+
+ std::vector<int> col_row_counts(num_columns, 0);
+
+ // Iterate over all the RowGroups in the file
+ for (int r = 0; r < num_row_groups; ++r) {
+ // Get the RowGroup Reader
+ std::shared_ptr<parquet::RowGroupReader> row_group_reader =
+ parquet_reader->RowGroup(r);
+
+ assert(row_group_reader->metadata()->total_byte_size() < ROW_GROUP_SIZE);
+
+ int64_t values_read = 0;
+ int64_t rows_read = 0;
+ int16_t definition_level;
+ int16_t repetition_level;
+ std::shared_ptr<parquet::ColumnReader> column_reader;
+ int col_id = 0;
+
+ ARROW_UNUSED(rows_read); // prevent warning in release build
+
+ // Get the Column Reader for the boolean column
+ column_reader = row_group_reader->Column(col_id);
+ parquet::BoolReader* bool_reader =
+ static_cast<parquet::BoolReader*>(column_reader.get());
+
+ // Read all the rows in the column
+ while (bool_reader->HasNext()) {
+ bool value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = bool_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ bool expected_value = ((col_row_counts[col_id] % 2) == 0) ? true : false;
+ assert(value == expected_value);
+ col_row_counts[col_id]++;
+ }
+
+ // Get the Column Reader for the Int32 column
+ col_id++;
+ column_reader = row_group_reader->Column(col_id);
+ parquet::Int32Reader* int32_reader =
+ static_cast<parquet::Int32Reader*>(column_reader.get());
+ // Read all the rows in the column
+ while (int32_reader->HasNext()) {
+ int32_t value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = int32_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ assert(value == col_row_counts[col_id]);
+ col_row_counts[col_id]++;
+ }
+
+ // Get the Column Reader for the Int64 column
+ col_id++;
+ column_reader = row_group_reader->Column(col_id);
+ parquet::Int64Reader* int64_reader =
+ static_cast<parquet::Int64Reader*>(column_reader.get());
+ // Read all the rows in the column
+ while (int64_reader->HasNext()) {
+ int64_t value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = int64_reader->ReadBatch(1, &definition_level, &repetition_level,
+ &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ int64_t expected_value = col_row_counts[col_id];
+ assert(value == expected_value);
+ if ((col_row_counts[col_id] % 2) == 0) {
+ assert(repetition_level == 0);
+ } else {
+ assert(repetition_level == 1);
+ }
+ col_row_counts[col_id]++;
+ }
+
+ // Get the Column Reader for the Int96 column
+ col_id++;
+ column_reader = row_group_reader->Column(col_id);
+ parquet::Int96Reader* int96_reader =
+ static_cast<parquet::Int96Reader*>(column_reader.get());
+ // Read all the rows in the column
+ while (int96_reader->HasNext()) {
+ parquet::Int96 value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = int96_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ parquet::Int96 expected_value;
+ ARROW_UNUSED(expected_value); // prevent warning in release build
+ expected_value.value[0] = col_row_counts[col_id];
+ expected_value.value[1] = col_row_counts[col_id] + 1;
+ expected_value.value[2] = col_row_counts[col_id] + 2;
+ for (int j = 0; j < 3; j++) {
+ assert(value.value[j] == expected_value.value[j]);
+ }
+ col_row_counts[col_id]++;
+ }
+
+ // Get the Column Reader for the Float column
+ col_id++;
+ column_reader = row_group_reader->Column(col_id);
+ parquet::FloatReader* float_reader =
+ static_cast<parquet::FloatReader*>(column_reader.get());
+ // Read all the rows in the column
+ while (float_reader->HasNext()) {
+ float value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = float_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ float expected_value = static_cast<float>(col_row_counts[col_id]) * 1.1f;
+ assert(value == expected_value);
+ col_row_counts[col_id]++;
+ }
+
+ // Get the Column Reader for the Double column
+ col_id++;
+ column_reader = row_group_reader->Column(col_id);
+ parquet::DoubleReader* double_reader =
+ static_cast<parquet::DoubleReader*>(column_reader.get());
+ // Read all the rows in the column
+ while (double_reader->HasNext()) {
+ double value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = double_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ double expected_value = col_row_counts[col_id] * 1.1111111;
+ assert(value == expected_value);
+ col_row_counts[col_id]++;
+ }
+
+ // Get the Column Reader for the ByteArray column
+ col_id++;
+ column_reader = row_group_reader->Column(col_id);
+ parquet::ByteArrayReader* ba_reader =
+ static_cast<parquet::ByteArrayReader*>(column_reader.get());
+ // Read all the rows in the column
+ while (ba_reader->HasNext()) {
+ parquet::ByteArray value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read =
+ ba_reader->ReadBatch(1, &definition_level, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // Verify the value written
+ char expected_value[FIXED_LENGTH] = "parquet";
+ ARROW_UNUSED(expected_value); // prevent warning in release build
+ expected_value[7] = static_cast<char>('0' + col_row_counts[col_id] / 100);
+ expected_value[8] = static_cast<char>('0' + (col_row_counts[col_id] / 10) % 10);
+ expected_value[9] = static_cast<char>('0' + col_row_counts[col_id] % 10);
+ if (col_row_counts[col_id] % 2 == 0) { // only alternate values exist
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ assert(value.len == FIXED_LENGTH);
+ assert(memcmp(value.ptr, &expected_value[0], FIXED_LENGTH) == 0);
+ assert(definition_level == 1);
+ } else {
+ // There are NULL values in the rows written
+ assert(values_read == 0);
+ assert(definition_level == 0);
+ }
+ col_row_counts[col_id]++;
+ }
+
+ // Get the Column Reader for the FixedLengthByteArray column
+ col_id++;
+ column_reader = row_group_reader->Column(col_id);
+ parquet::FixedLenByteArrayReader* flba_reader =
+ static_cast<parquet::FixedLenByteArrayReader*>(column_reader.get());
+ // Read all the rows in the column
+ while (flba_reader->HasNext()) {
+ parquet::FixedLenByteArray value;
+ // Read one value at a time. The number of rows read is returned. values_read
+ // contains the number of non-null rows
+ rows_read = flba_reader->ReadBatch(1, nullptr, nullptr, &value, &values_read);
+ // Ensure only one value is read
+ assert(rows_read == 1);
+ // There are no NULL values in the rows written
+ assert(values_read == 1);
+ // Verify the value written
+ char v = static_cast<char>(col_row_counts[col_id]);
+ char expected_value[FIXED_LENGTH] = {v, v, v, v, v, v, v, v, v, v};
+ assert(memcmp(value.ptr, &expected_value[0], FIXED_LENGTH) == 0);
+ col_row_counts[col_id]++;
+ }
+ }
+ } catch (const std::exception& e) {
+ std::cerr << "Parquet read error: " << e.what() << std::endl;
+ return -1;
+ }
+
+ std::cout << "Parquet Writing and Reading Complete" << std::endl;
+
+ return 0;
+}
diff --git a/src/arrow/cpp/examples/parquet/parquet_arrow/CMakeLists.txt b/src/arrow/cpp/examples/parquet/parquet_arrow/CMakeLists.txt
new file mode 100644
index 000000000..43eb21957
--- /dev/null
+++ b/src/arrow/cpp/examples/parquet/parquet_arrow/CMakeLists.txt
@@ -0,0 +1,42 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+# Require cmake that supports BYPRODUCTS in add_custom_command, ExternalProject_Add [1].
+cmake_minimum_required(VERSION 3.2.0)
+
+project(parquet_arrow_example)
+
+include(ExternalProject)
+include(FindPkgConfig)
+include(GNUInstallDirs)
+
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake_modules")
+
+# This ensures that things like gnu++11 get passed correctly
+set(CMAKE_CXX_STANDARD 11)
+
+# We require a C++11 compliant compiler
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+# Look for installed packages the system
+find_package(Arrow REQUIRED)
+find_package(Parquet REQUIRED)
+
+include_directories(SYSTEM ${ARROW_INCLUDE_DIR} ${PARQUET_INCLUDE_DIR})
+
+add_executable(parquet_arrow_example reader_writer.cc)
+target_link_libraries(parquet_arrow_example ${PARQUET_SHARED_LIB} ${ARROW_SHARED_LIB})
diff --git a/src/arrow/cpp/examples/parquet/parquet_arrow/README.md b/src/arrow/cpp/examples/parquet/parquet_arrow/README.md
new file mode 100644
index 000000000..e99819fd2
--- /dev/null
+++ b/src/arrow/cpp/examples/parquet/parquet_arrow/README.md
@@ -0,0 +1,20 @@
+<!---
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License. See accompanying LICENSE file.
+-->
+
+Using parquet-cpp with the arrow interface
+==========================================
+
+This folder contains an example project that shows how to setup a CMake project
+that consumes `parquet-cpp` as a library as well as how you can use the
+`parquet/arrow` interface to reading and write Apache Parquet files.
diff --git a/src/arrow/cpp/examples/parquet/parquet_arrow/reader_writer.cc b/src/arrow/cpp/examples/parquet/parquet_arrow/reader_writer.cc
new file mode 100644
index 000000000..f5d96ec16
--- /dev/null
+++ b/src/arrow/cpp/examples/parquet/parquet_arrow/reader_writer.cc
@@ -0,0 +1,140 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#include <arrow/api.h>
+#include <arrow/io/api.h>
+#include <parquet/arrow/reader.h>
+#include <parquet/arrow/writer.h>
+#include <parquet/exception.h>
+
+#include <iostream>
+
+// #0 Build dummy data to pass around
+// To have some input data, we first create an Arrow Table that holds
+// some data.
+std::shared_ptr<arrow::Table> generate_table() {
+ arrow::Int64Builder i64builder;
+ PARQUET_THROW_NOT_OK(i64builder.AppendValues({1, 2, 3, 4, 5}));
+ std::shared_ptr<arrow::Array> i64array;
+ PARQUET_THROW_NOT_OK(i64builder.Finish(&i64array));
+
+ arrow::StringBuilder strbuilder;
+ PARQUET_THROW_NOT_OK(strbuilder.Append("some"));
+ PARQUET_THROW_NOT_OK(strbuilder.Append("string"));
+ PARQUET_THROW_NOT_OK(strbuilder.Append("content"));
+ PARQUET_THROW_NOT_OK(strbuilder.Append("in"));
+ PARQUET_THROW_NOT_OK(strbuilder.Append("rows"));
+ std::shared_ptr<arrow::Array> strarray;
+ PARQUET_THROW_NOT_OK(strbuilder.Finish(&strarray));
+
+ std::shared_ptr<arrow::Schema> schema = arrow::schema(
+ {arrow::field("int", arrow::int64()), arrow::field("str", arrow::utf8())});
+
+ return arrow::Table::Make(schema, {i64array, strarray});
+}
+
+// #1 Write out the data as a Parquet file
+void write_parquet_file(const arrow::Table& table) {
+ std::shared_ptr<arrow::io::FileOutputStream> outfile;
+ PARQUET_ASSIGN_OR_THROW(
+ outfile, arrow::io::FileOutputStream::Open("parquet-arrow-example.parquet"));
+ // The last argument to the function call is the size of the RowGroup in
+ // the parquet file. Normally you would choose this to be rather large but
+ // for the example, we use a small value to have multiple RowGroups.
+ PARQUET_THROW_NOT_OK(
+ parquet::arrow::WriteTable(table, arrow::default_memory_pool(), outfile, 3));
+}
+
+// #2: Fully read in the file
+void read_whole_file() {
+ std::cout << "Reading parquet-arrow-example.parquet at once" << std::endl;
+ std::shared_ptr<arrow::io::ReadableFile> infile;
+ PARQUET_ASSIGN_OR_THROW(infile,
+ arrow::io::ReadableFile::Open("parquet-arrow-example.parquet",
+ arrow::default_memory_pool()));
+
+ std::unique_ptr<parquet::arrow::FileReader> reader;
+ PARQUET_THROW_NOT_OK(
+ parquet::arrow::OpenFile(infile, arrow::default_memory_pool(), &reader));
+ std::shared_ptr<arrow::Table> table;
+ PARQUET_THROW_NOT_OK(reader->ReadTable(&table));
+ std::cout << "Loaded " << table->num_rows() << " rows in " << table->num_columns()
+ << " columns." << std::endl;
+}
+
+// #3: Read only a single RowGroup of the parquet file
+void read_single_rowgroup() {
+ std::cout << "Reading first RowGroup of parquet-arrow-example.parquet" << std::endl;
+ std::shared_ptr<arrow::io::ReadableFile> infile;
+ PARQUET_ASSIGN_OR_THROW(infile,
+ arrow::io::ReadableFile::Open("parquet-arrow-example.parquet",
+ arrow::default_memory_pool()));
+
+ std::unique_ptr<parquet::arrow::FileReader> reader;
+ PARQUET_THROW_NOT_OK(
+ parquet::arrow::OpenFile(infile, arrow::default_memory_pool(), &reader));
+ std::shared_ptr<arrow::Table> table;
+ PARQUET_THROW_NOT_OK(reader->RowGroup(0)->ReadTable(&table));
+ std::cout << "Loaded " << table->num_rows() << " rows in " << table->num_columns()
+ << " columns." << std::endl;
+}
+
+// #4: Read only a single column of the whole parquet file
+void read_single_column() {
+ std::cout << "Reading first column of parquet-arrow-example.parquet" << std::endl;
+ std::shared_ptr<arrow::io::ReadableFile> infile;
+ PARQUET_ASSIGN_OR_THROW(infile,
+ arrow::io::ReadableFile::Open("parquet-arrow-example.parquet",
+ arrow::default_memory_pool()));
+
+ std::unique_ptr<parquet::arrow::FileReader> reader;
+ PARQUET_THROW_NOT_OK(
+ parquet::arrow::OpenFile(infile, arrow::default_memory_pool(), &reader));
+ std::shared_ptr<arrow::ChunkedArray> array;
+ PARQUET_THROW_NOT_OK(reader->ReadColumn(0, &array));
+ PARQUET_THROW_NOT_OK(arrow::PrettyPrint(*array, 4, &std::cout));
+ std::cout << std::endl;
+}
+
+// #5: Read only a single column of a RowGroup (this is known as ColumnChunk)
+// from the Parquet file.
+void read_single_column_chunk() {
+ std::cout << "Reading first ColumnChunk of the first RowGroup of "
+ "parquet-arrow-example.parquet"
+ << std::endl;
+ std::shared_ptr<arrow::io::ReadableFile> infile;
+ PARQUET_ASSIGN_OR_THROW(infile,
+ arrow::io::ReadableFile::Open("parquet-arrow-example.parquet",
+ arrow::default_memory_pool()));
+
+ std::unique_ptr<parquet::arrow::FileReader> reader;
+ PARQUET_THROW_NOT_OK(
+ parquet::arrow::OpenFile(infile, arrow::default_memory_pool(), &reader));
+ std::shared_ptr<arrow::ChunkedArray> array;
+ PARQUET_THROW_NOT_OK(reader->RowGroup(0)->Column(0)->Read(&array));
+ PARQUET_THROW_NOT_OK(arrow::PrettyPrint(*array, 4, &std::cout));
+ std::cout << std::endl;
+}
+
+int main(int argc, char** argv) {
+ std::shared_ptr<arrow::Table> table = generate_table();
+ write_parquet_file(*table);
+ read_whole_file();
+ read_single_rowgroup();
+ read_single_column();
+ read_single_column_chunk();
+}
diff --git a/src/arrow/cpp/examples/parquet/parquet_stream_api/stream_reader_writer.cc b/src/arrow/cpp/examples/parquet/parquet_stream_api/stream_reader_writer.cc
new file mode 100644
index 000000000..64ab7af49
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+++ b/src/arrow/cpp/examples/parquet/parquet_stream_api/stream_reader_writer.cc
@@ -0,0 +1,324 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#include <cassert>
+#include <chrono>
+#include <cstdint>
+#include <cstring>
+#include <ctime>
+#include <iomanip>
+#include <iostream>
+#include <utility>
+
+#include "arrow/io/file.h"
+#include "parquet/exception.h"
+#include "parquet/stream_reader.h"
+#include "parquet/stream_writer.h"
+
+// This file gives an example of how to use the parquet::StreamWriter
+// and parquet::StreamReader classes.
+// It shows writing/reading of the supported types as well as how a
+// user-defined type can be handled.
+
+template <typename T>
+using optional = parquet::StreamReader::optional<T>;
+
+// Example of a user-defined type to be written to/read from Parquet
+// using C++ input/output operators.
+class UserTimestamp {
+ public:
+ UserTimestamp() = default;
+
+ explicit UserTimestamp(const std::chrono::microseconds v) : ts_{v} {}
+
+ bool operator==(const UserTimestamp& x) const { return ts_ == x.ts_; }
+
+ void dump(std::ostream& os) const {
+ const auto t = static_cast<std::time_t>(
+ std::chrono::duration_cast<std::chrono::seconds>(ts_).count());
+ os << std::put_time(std::gmtime(&t), "%Y%m%d-%H%M%S");
+ }
+
+ void dump(parquet::StreamWriter& os) const { os << ts_; }
+
+ private:
+ std::chrono::microseconds ts_;
+};
+
+std::ostream& operator<<(std::ostream& os, const UserTimestamp& v) {
+ v.dump(os);
+ return os;
+}
+
+parquet::StreamWriter& operator<<(parquet::StreamWriter& os, const UserTimestamp& v) {
+ v.dump(os);
+ return os;
+}
+
+parquet::StreamReader& operator>>(parquet::StreamReader& os, UserTimestamp& v) {
+ std::chrono::microseconds ts;
+
+ os >> ts;
+ v = UserTimestamp{ts};
+
+ return os;
+}
+
+std::shared_ptr<parquet::schema::GroupNode> GetSchema() {
+ parquet::schema::NodeVector fields;
+
+ fields.push_back(parquet::schema::PrimitiveNode::Make(
+ "string_field", parquet::Repetition::OPTIONAL, parquet::Type::BYTE_ARRAY,
+ parquet::ConvertedType::UTF8));
+
+ fields.push_back(parquet::schema::PrimitiveNode::Make(
+ "char_field", parquet::Repetition::REQUIRED, parquet::Type::FIXED_LEN_BYTE_ARRAY,
+ parquet::ConvertedType::NONE, 1));
+
+ fields.push_back(parquet::schema::PrimitiveNode::Make(
+ "char[4]_field", parquet::Repetition::REQUIRED, parquet::Type::FIXED_LEN_BYTE_ARRAY,
+ parquet::ConvertedType::NONE, 4));
+
+ fields.push_back(parquet::schema::PrimitiveNode::Make(
+ "int8_field", parquet::Repetition::REQUIRED, parquet::Type::INT32,
+ parquet::ConvertedType::INT_8));
+
+ fields.push_back(parquet::schema::PrimitiveNode::Make(
+ "uint16_field", parquet::Repetition::REQUIRED, parquet::Type::INT32,
+ parquet::ConvertedType::UINT_16));
+
+ fields.push_back(parquet::schema::PrimitiveNode::Make(
+ "int32_field", parquet::Repetition::REQUIRED, parquet::Type::INT32,
+ parquet::ConvertedType::INT_32));
+
+ fields.push_back(parquet::schema::PrimitiveNode::Make(
+ "uint64_field", parquet::Repetition::OPTIONAL, parquet::Type::INT64,
+ parquet::ConvertedType::UINT_64));
+
+ fields.push_back(parquet::schema::PrimitiveNode::Make(
+ "double_field", parquet::Repetition::REQUIRED, parquet::Type::DOUBLE,
+ parquet::ConvertedType::NONE));
+
+ // User defined timestamp type.
+ fields.push_back(parquet::schema::PrimitiveNode::Make(
+ "timestamp_field", parquet::Repetition::REQUIRED, parquet::Type::INT64,
+ parquet::ConvertedType::TIMESTAMP_MICROS));
+
+ fields.push_back(parquet::schema::PrimitiveNode::Make(
+ "chrono_milliseconds_field", parquet::Repetition::REQUIRED, parquet::Type::INT64,
+ parquet::ConvertedType::TIMESTAMP_MILLIS));
+
+ return std::static_pointer_cast<parquet::schema::GroupNode>(
+ parquet::schema::GroupNode::Make("schema", parquet::Repetition::REQUIRED, fields));
+}
+
+struct TestData {
+ static const int num_rows = 2000;
+
+ static void init() { std::time(&ts_offset_); }
+
+ static optional<std::string> GetOptString(const int i) {
+ if (i % 2 == 0) return {};
+ return "Str #" + std::to_string(i);
+ }
+ static arrow::util::string_view GetStringView(const int i) {
+ static std::string string;
+ string = "StringView #" + std::to_string(i);
+ return arrow::util::string_view(string);
+ }
+ static const char* GetCharPtr(const int i) {
+ static std::string string;
+ string = "CharPtr #" + std::to_string(i);
+ return string.c_str();
+ }
+ static char GetChar(const int i) { return i & 1 ? 'M' : 'F'; }
+ static int8_t GetInt8(const int i) { return static_cast<int8_t>((i % 256) - 128); }
+ static uint16_t GetUInt16(const int i) { return static_cast<uint16_t>(i); }
+ static int32_t GetInt32(const int i) { return 3 * i - 17; }
+ static optional<uint64_t> GetOptUInt64(const int i) {
+ if (i % 11 == 0) return {};
+ return (1ull << 40) + i * i + 101;
+ }
+ static double GetDouble(const int i) { return 6.62607004e-34 * 3e8 * i; }
+ static UserTimestamp GetUserTimestamp(const int i) {
+ return UserTimestamp{std::chrono::microseconds{(ts_offset_ + 3 * i) * 1000000 + i}};
+ }
+ static std::chrono::milliseconds GetChronoMilliseconds(const int i) {
+ return std::chrono::milliseconds{(ts_offset_ + 3 * i) * 1000ull + i};
+ }
+
+ static char char4_array[4];
+
+ private:
+ static std::time_t ts_offset_;
+};
+
+char TestData::char4_array[] = "XYZ";
+std::time_t TestData::ts_offset_;
+
+void WriteParquetFile() {
+ std::shared_ptr<arrow::io::FileOutputStream> outfile;
+
+ PARQUET_ASSIGN_OR_THROW(
+ outfile, arrow::io::FileOutputStream::Open("parquet-stream-api-example.parquet"));
+
+ parquet::WriterProperties::Builder builder;
+
+#if defined ARROW_WITH_BROTLI
+ builder.compression(parquet::Compression::BROTLI);
+#elif defined ARROW_WITH_ZSTD
+ builder.compression(parquet::Compression::ZSTD);
+#endif
+
+ parquet::StreamWriter os{
+ parquet::ParquetFileWriter::Open(outfile, GetSchema(), builder.build())};
+
+ os.SetMaxRowGroupSize(1000);
+
+ for (auto i = 0; i < TestData::num_rows; ++i) {
+ // Output string using 3 different types: std::string, arrow::util::string_view and
+ // const char *.
+ switch (i % 3) {
+ case 0:
+ os << TestData::GetOptString(i);
+ break;
+ case 1:
+ os << TestData::GetStringView(i);
+ break;
+ case 2:
+ os << TestData::GetCharPtr(i);
+ break;
+ }
+ os << TestData::GetChar(i);
+ switch (i % 2) {
+ case 0:
+ os << TestData::char4_array;
+ break;
+ case 1:
+ os << parquet::StreamWriter::FixedStringView{TestData::GetCharPtr(i), 4};
+ break;
+ }
+ os << TestData::GetInt8(i);
+ os << TestData::GetUInt16(i);
+ os << TestData::GetInt32(i);
+ os << TestData::GetOptUInt64(i);
+ os << TestData::GetDouble(i);
+ os << TestData::GetUserTimestamp(i);
+ os << TestData::GetChronoMilliseconds(i);
+ os << parquet::EndRow;
+
+ if (i == TestData::num_rows / 2) {
+ os << parquet::EndRowGroup;
+ }
+ }
+ std::cout << "Parquet Stream Writing complete." << std::endl;
+}
+
+void ReadParquetFile() {
+ std::shared_ptr<arrow::io::ReadableFile> infile;
+
+ PARQUET_ASSIGN_OR_THROW(
+ infile, arrow::io::ReadableFile::Open("parquet-stream-api-example.parquet"));
+
+ parquet::StreamReader os{parquet::ParquetFileReader::Open(infile)};
+
+ optional<std::string> opt_string;
+ char ch;
+ char char_array[4];
+ int8_t int8;
+ uint16_t uint16;
+ int32_t int32;
+ optional<uint64_t> opt_uint64;
+ double d;
+ UserTimestamp ts_user;
+ std::chrono::milliseconds ts_ms;
+ int i;
+
+ for (i = 0; !os.eof(); ++i) {
+ os >> opt_string;
+ os >> ch;
+ os >> char_array;
+ os >> int8;
+ os >> uint16;
+ os >> int32;
+ os >> opt_uint64;
+ os >> d;
+ os >> ts_user;
+ os >> ts_ms;
+ os >> parquet::EndRow;
+
+ if (0) {
+ // For debugging.
+ std::cout << "Row #" << i << std::endl;
+
+ std::cout << "string[";
+ if (opt_string) {
+ std::cout << *opt_string;
+ } else {
+ std::cout << "N/A";
+ }
+ std::cout << "] char[" << ch << "] charArray[" << char_array << "] int8["
+ << int(int8) << "] uint16[" << uint16 << "] int32[" << int32;
+ std::cout << "] uint64[";
+ if (opt_uint64) {
+ std::cout << *opt_uint64;
+ } else {
+ std::cout << "N/A";
+ }
+ std::cout << "] double[" << d << "] tsUser[" << ts_user << "] tsMs["
+ << ts_ms.count() << "]" << std::endl;
+ }
+ // Check data.
+ switch (i % 3) {
+ case 0:
+ assert(opt_string == TestData::GetOptString(i));
+ break;
+ case 1:
+ assert(*opt_string == TestData::GetStringView(i));
+ break;
+ case 2:
+ assert(*opt_string == TestData::GetCharPtr(i));
+ break;
+ }
+ assert(ch == TestData::GetChar(i));
+ switch (i % 2) {
+ case 0:
+ assert(0 == std::memcmp(char_array, TestData::char4_array, sizeof(char_array)));
+ break;
+ case 1:
+ assert(0 == std::memcmp(char_array, TestData::GetCharPtr(i), sizeof(char_array)));
+ break;
+ }
+ assert(int8 == TestData::GetInt8(i));
+ assert(uint16 == TestData::GetUInt16(i));
+ assert(int32 == TestData::GetInt32(i));
+ assert(opt_uint64 == TestData::GetOptUInt64(i));
+ assert(std::abs(d - TestData::GetDouble(i)) < 1e-6);
+ assert(ts_user == TestData::GetUserTimestamp(i));
+ assert(ts_ms == TestData::GetChronoMilliseconds(i));
+ }
+ assert(TestData::num_rows == i);
+
+ std::cout << "Parquet Stream Reading complete." << std::endl;
+}
+
+int main() {
+ WriteParquetFile();
+ ReadParquetFile();
+
+ return 0;
+}