pitrou commented on code in PR #44184:
URL: https://github.com/apache/arrow/pull/44184#discussion_r2137971547


##########
cpp/src/arrow/compute/kernels/aggregate_test.cc:
##########
@@ -495,51 +495,67 @@ TEST_F(TestSumKernelRoundOff, Basics) {
 }
 
 TEST(TestDecimalSumKernel, SimpleSum) {
-  for (const auto& ty : {decimal128(3, 2), decimal256(3, 2)}) {
+  std::vector<std::shared_ptr<DataType>> init_types = {decimal128(3, 2),
+                                                       decimal256(3, 2)};
+  std::vector<std::shared_ptr<DataType>> out_types = {decimal128(38, 2),
+                                                      decimal256(76, 2)};
+
+  for (size_t i = 0; i < init_types.size(); ++i) {
+    auto& ty = init_types[i];
+    auto& out_ty = out_types[i];
+
     EXPECT_THAT(Sum(ArrayFromJSON(ty, R"([])")),
-                ResultWith(ScalarFromJSON(ty, R"(null)")));
+                ResultWith(ScalarFromJSON(out_ty, R"(null)")));
     EXPECT_THAT(Sum(ArrayFromJSON(ty, R"([null])")),
-                ResultWith(ScalarFromJSON(ty, R"(null)")));
+                ResultWith(ScalarFromJSON(out_ty, R"(null)")));
     EXPECT_THAT(
         Sum(ArrayFromJSON(ty, R"(["0.00", "1.01", "2.02", "3.03", "4.04", 
"5.05"])")),
-        ResultWith(ScalarFromJSON(ty, R"("15.15")")));
+        ResultWith(ScalarFromJSON(out_ty, R"("15.15")")));
     Datum chunks =
         ChunkedArrayFromJSON(ty, {R"(["0.00", "1.01", "2.02", "3.03", "4.04", 
"5.05"])"});
-    EXPECT_THAT(Sum(chunks), ResultWith(ScalarFromJSON(ty, R"("15.15")")));
+    EXPECT_THAT(Sum(chunks), ResultWith(ScalarFromJSON(out_ty, R"("15.15")")));
     chunks = ChunkedArrayFromJSON(
         ty, {R"(["0.00", "1.01", "2.02"])", R"(["3.03", "4.04", "5.05"])"});
-    EXPECT_THAT(Sum(chunks), ResultWith(ScalarFromJSON(ty, R"("15.15")")));
+    EXPECT_THAT(Sum(chunks), ResultWith(ScalarFromJSON(out_ty, R"("15.15")")));
     chunks = ChunkedArrayFromJSON(
         ty, {R"(["0.00", "1.01", "2.02"])", "[]", R"(["3.03", "4.04", 
"5.05"])"});
-    EXPECT_THAT(Sum(chunks), ResultWith(ScalarFromJSON(ty, R"("15.15")")));
+    EXPECT_THAT(Sum(chunks), ResultWith(ScalarFromJSON(out_ty, R"("15.15")")));
 
     ScalarAggregateOptions options(/*skip_nulls=*/true, /*min_count=*/0);
     EXPECT_THAT(Sum(ArrayFromJSON(ty, R"([])"), options),
-                ResultWith(ScalarFromJSON(ty, R"("0.00")")));
+                ResultWith(ScalarFromJSON(out_ty, R"("0.00")")));
     EXPECT_THAT(Sum(ArrayFromJSON(ty, R"([null])"), options),
-                ResultWith(ScalarFromJSON(ty, R"("0.00")")));
+                ResultWith(ScalarFromJSON(out_ty, R"("0.00")")));
     chunks = ChunkedArrayFromJSON(ty, {});
-    EXPECT_THAT(Sum(chunks, options), ResultWith(ScalarFromJSON(ty, 
R"("0.00")")));
+    EXPECT_THAT(Sum(chunks, options), ResultWith(ScalarFromJSON(out_ty, 
R"("0.00")")));
 
     EXPECT_THAT(
         Sum(ArrayFromJSON(ty, R"(["1.01", null, "3.03", null, "5.05", null, 
"7.07"])"),
             options),
-        ResultWith(ScalarFromJSON(ty, R"("16.16")")));
+        ResultWith(ScalarFromJSON(out_ty, R"("16.16")")));
 
     EXPECT_THAT(Sum(ScalarFromJSON(ty, R"("5.05")")),
-                ResultWith(ScalarFromJSON(ty, R"("5.05")")));
+                ResultWith(ScalarFromJSON(out_ty, R"("5.05")")));
     EXPECT_THAT(Sum(ScalarFromJSON(ty, R"(null)")),
-                ResultWith(ScalarFromJSON(ty, R"(null)")));
+                ResultWith(ScalarFromJSON(out_ty, R"(null)")));
     EXPECT_THAT(Sum(ScalarFromJSON(ty, R"(null)"), options),
-                ResultWith(ScalarFromJSON(ty, R"("0.00")")));
+                ResultWith(ScalarFromJSON(out_ty, R"("0.00")")));

Review Comment:
   Ok, but this PR adds support for situations which were not supported before, 
so we test for them anyway, no?



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