Function TEST_F

cpp/src/arrow/compute/kernels/aggregate_test.cc:477–495

class TestSumKernelRoundOff : public ::testing::Test {};

TEST_F(TestSumKernelRoundOff, Basics) {
  using ScalarType = typename TypeTraits<DoubleType>::ScalarType;

  // array = np.arange(321000, dtype='float64')
  // array -= np.mean(array)
  // array *= array
  double index = 0;
  ASSERT_OK_AND_ASSIGN(
      auto array, ArrayFromBuilderVisitor(
                      float64(), 321000, [&](NumericBuilder<DoubleType>* builder) {
                        builder->UnsafeAppend((index - 160499.5) * (index - 160499.5));
                        ++index;
                      }));

  // reference value from numpy.sum()
  ASSERT_OK_AND_ASSIGN(Datum result, Sum(array));
  auto sum = checked_cast<const ScalarType*>(result.scalar().get());
  ASSERT_EQ(sum->value, 2756346749973250.0);
}

TEST(TestDecimalSumKernel, SimpleSum) {
  std::vector<std::shared_ptr<DataType>> init_types = {decimal128(3, 2),