Function decimal128

cpp/src/arrow/type.cc:3364–3366

}

std::shared_ptr<DataType> decimal128(int32_t precision, int32_t scale) {
  return std::make_shared<Decimal128Type>(precision, scale);
}

std::shared_ptr<DataType> decimal256(int32_t precision, int32_t scale) {
  return std::make_shared<Decimal256Type>(precision, scale);