Function GetCastToFloating

cpp/src/arrow/compute/kernels/scalar_cast_numeric.cc:825–857

template <typename OutType>
std::shared_ptr<CastFunction> GetCastToFloating(std::string name) {
  auto func = std::make_shared<CastFunction>(std::move(name), OutType::type_id);
  auto out_ty = TypeTraits<OutType>::type_singleton();

  // Casts from integer to floating point
  for (const std::shared_ptr<DataType>& in_ty : IntTypes()) {
    DCHECK_OK(func->AddKernel(in_ty->id(), {in_ty}, out_ty, CastIntegerToFloating));
  }

  // Cast from floating point
  for (const std::shared_ptr<DataType>& in_ty : FloatingPointTypes()) {
    DCHECK_OK(func->AddKernel(in_ty->id(), {in_ty}, out_ty, CastFloatingToFloating));
  }

  // From half-float to float/double
  DCHECK_OK(func->AddKernel(Type::HALF_FLOAT, {InputType(Type::HALF_FLOAT)}, out_ty,
                            CastFloatingToFloating));

  // From other numbers to floating point
  AddCommonNumberCasts<OutType>(out_ty, func.get());

  // From decimal to floating point
  DCHECK_OK(func->AddKernel(Type::DECIMAL32, {InputType(Type::DECIMAL32)}, out_ty,
                            CastFunctor<OutType, Decimal32Type>::Exec));
  DCHECK_OK(func->AddKernel(Type::DECIMAL64, {InputType(Type::DECIMAL64)}, out_ty,
                            CastFunctor<OutType, Decimal64Type>::Exec));
  DCHECK_OK(func->AddKernel(Type::DECIMAL, {InputType(Type::DECIMAL)}, out_ty,
                            CastFunctor<OutType, Decimal128Type>::Exec));
  DCHECK_OK(func->AddKernel(Type::DECIMAL256, {InputType(Type::DECIMAL256)}, out_ty,
                            CastFunctor<OutType, Decimal256Type>::Exec));

  return func;
}

std::shared_ptr<CastFunction> GetCastToDecimal32() {
  OutputType sig_out_ty(ResolveOutputFromOptions);