arrow.cpp

// NOTE: Taken from https://github.com/apache/arrow/blob/main/cpp/examples/minimal_build/example.cc
// Test file -> https://raw.githubusercontent.com/apache/arrow/main/cpp/examples/minimal_build/test.csv
// An awesome viewer -> visidata.org

#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;
}