Function NullableArray

cpp/src/parquet/arrow/test_util.h:195–218

// This helper function only supports (size/2) nulls.
template <typename ArrowType>
::arrow::enable_if_floating_point<ArrowType, Status> NullableArray(
    size_t size, size_t num_nulls, uint32_t seed, std::shared_ptr<Array>* out) {
  using c_type = typename ArrowType::c_type;
  std::vector<c_type> values;
  if constexpr (::arrow::is_half_float_type<ArrowType>::value) {
    values.resize(size);
    test::random_float16_numbers(static_cast<int>(size), 0, ::arrow::util::Float16(-1e4f),
                                 ::arrow::util::Float16(1e4f), values.data());
  } else {
    ::arrow::random_real(size, seed, static_cast<c_type>(-1e10),
                         static_cast<c_type>(1e10), &values);
  }
  std::vector<uint8_t> valid_bytes(size, 1);

  for (size_t i = 0; i < num_nulls; i++) {
    valid_bytes[i * 2] = 0;
  }

  ::arrow::NumericBuilder<ArrowType> builder;
  if (values.size() > 0) {
    RETURN_NOT_OK(builder.AppendValues(values.data(), values.size(), valid_bytes.data()));
  }
  return builder.Finish(out);
}

// This helper function only supports (size/2) nulls.
template <typename ArrowType>