Function AssertNullToNull

cpp/src/arrow/compute/kernels/scalar_arithmetic_test.cc:71–88

Assert that all-null-type inputs results in a null-type output.

// Assert that all-null-type inputs results in a null-type output.
void AssertNullToNull(const std::string& func_name) {
  SCOPED_TRACE(func_name);
  ASSERT_OK_AND_ASSIGN(auto func, GetFunctionRegistry()->GetFunction(func_name));
  ASSERT_OK_AND_ASSIGN(auto nulls, MakeArrayOfNull(null(), /*length=*/7));
  const auto n = func->arity().num_args;

  {
    std::vector<Datum> args(n, nulls);
    ASSERT_OK_AND_ASSIGN(auto result, CallFunction(func_name, args));
    AssertArraysEqual(*nulls, *result.make_array(), /*verbose=*/true);
  }

  {
    std::vector<Datum> args(n, Datum(std::make_shared<NullScalar>()));
    ASSERT_OK_AND_ASSIGN(auto result, CallFunction(func_name, args));
    AssertScalarsEqual(NullScalar(), *result.scalar(), /*verbose=*/true);
  }
}

template <typename T>
class TestBaseArithmetic : public ::testing::Test {