[GitHub] [arrow] pitrou commented on a change in pull request #7478: ARROW-9055: [C++] Add sum/mean kernels for Boolean type

[GitBox <gi...@apache.org>]

pitrou commented on a change in pull request #7478:
URL: https://github.com/apache/arrow/pull/7478#discussion_r442274099



##########
File path: cpp/src/arrow/compute/kernels/aggregate_test.cc
##########
@@ -127,6 +127,41 @@ void ValidateSum(const Array& array) {
   ValidateSum<ArrowType>(array, NaiveSum<ArrowType>(array));
 }
 
+using UnaryOp = Result<Datum>(const Datum&, ExecContext*);
+
+template <UnaryOp& Op, typename ScalarType>
+void ValidateBooleanAgg(const std::string& json,
+                        const std::shared_ptr<ScalarType>& expected) {
+  auto array = ArrayFromJSON(boolean(), json);
+  auto exp = Datum(expected);
+  ASSERT_OK_AND_ASSIGN(Datum result, Op(array, nullptr));
+  ASSERT_TRUE(result.Equals(exp));
+}
+
+TEST(TestBooleanAggregation, Sum) {
+  ValidateBooleanAgg<Sum>("[]", std::make_shared<UInt64Scalar>());

Review comment:
       Why isn't it 0 here?




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