Class Log2

cpp/src/arrow/compute/kernels/scalar_arithmetic.cc:427–438

};

struct Log2 {
  template <typename T, typename Arg>
  static enable_if_floating_value<Arg, T> Call(KernelContext*, Arg arg, Status*) {
    static_assert(std::is_same<T, Arg>::value, "");
    if (arg == 0.0) {
      return -std::numeric_limits<T>::infinity();
    } else if (arg < 0.0) {
      return std::numeric_limits<T>::quiet_NaN();
    }
    return std::log2(arg);
  }
};

struct Log2Checked {
  template <typename T, typename Arg>