michalursa commented on a change in pull request #10290:
URL: https://github.com/apache/arrow/pull/10290#discussion_r688217220



##########
File path: cpp/src/arrow/compute/kernels/hash_aggregate_test.cc
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@@ -991,6 +991,9 @@ TEST(GroupBy, SumOnlyStringAndDictKeys) {
                                            {
                                                {"hash_sum", nullptr},
                                            }));
+    if (key_type->Equals(utf8())) {

Review comment:
       SortBy doesn't work for string dictionary type. And accidentally the 
order does not change for this test case, so it works across the systems. If 
you can tell me how to sort dictionary array I will change it.




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