Function ValidateMean

cpp/src/arrow/compute/kernels/aggregate_test.cc:1233–1237

template <typename ArrowType>
void ValidateMean(const Array& input, Datum expected,
                  const ScalarAggregateOptions& options) {
  ASSERT_OK_AND_ASSIGN(Datum result, Mean(input, options, nullptr));
  AssertDatumsApproxEqual(expected, result, /*verbose=*/true);
}

template <typename ArrowType>
void ValidateMean(