Method generator

cpp/src/arrow/testing/generator.cc:235–238

  explicit RandomGenerator(std::shared_ptr<DataType> type) : type_(std::move(type)) {}

  random::RandomArrayGenerator* generator() {
    static random::RandomArrayGenerator instance(kTestSeed);
    return &instance;
  }

  Result<std::shared_ptr<Array>> Generate(int64_t num_rows) override {
    return generator()->ArrayOf(type_, num_rows);