How to retrieve an Array instead of ArrayData from a Compute Function with RecordBatches in Apache Arrow

I'm trying to extract an Array out of a Datum after a Compute Operation.

ARROW_ASSIGN_OR_RAISE(rbatch, ipc_reader->Read(i));
std::shared_ptr<arrow::Array> numbers_array_a = rbatch->column(2);
std::shared_ptr<arrow::Array> numbers_array_b = rbatch->column(3);

// Get element-wise sum of both columns A and B in our Table. Note that here we use
// CallFunction(), which takes the name of the function as the first argument.
ARROW_ASSIGN_OR_RAISE(my_datum, arrow::compute::CallFunction(
                                            "add", {numbers_array_a,
                                                    numbers_array_b}));

The Datum now holds an Int64 Array

std::cout << "Datum kind: " << my_datum.ToString()
              << " content type: " << my_datum.type()->ToString() << std::endl;

>> Datum kind: Array content type: int64

When I now try to print the Array

std::cout << my_datum.array()->ToString()<< std::end;

I get this Error

class "arrow::ArrayData" has no member "ToString"

The Array class has a ToString() function, but as fas as I know I can't convert ArrayData into an Array.

I tried to convert the ArrayData into an Array, I tried to initialize an Array with the ArrayData and I tried to access the values from the ArrayData all without success.
I tried to initialize a RecordBatch with ArrayData.

I also tried to look for alternatives to retrieve the Array from the Datum but also without success.

How can I print or even access the Array inside the Datum?

I think you want the arrow::Datum::make_array function:

std::shared_ptr<arrow::Array> result_array = my_datum.make_array();