[GitHub] [arrow] drin commented on a diff in pull request #13518: ARROW-16700: [C++][R][Datasets] aggregates on partitioning columns

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

drin commented on code in PR #13518:
URL: https://github.com/apache/arrow/pull/13518#discussion_r922566935


##########
cpp/src/arrow/dataset/scanner_test.cc:
##########
@@ -1445,9 +1446,13 @@ DatasetAndBatches MakeBasicDataset() {
           equal(field_ref("c"), literal(23)),
           equal(field_ref("c"), literal(47)),
       },
-      [](compute::ExecBatch* batch, const RecordBatch&) {
+      [](compute::ExecBatch* batch, const RecordBatch&, size_t guarantee_index) {
         // a placeholder will be inserted for partition field "c"
-        batch->values.emplace_back(std::make_shared<Int32Scalar>());
+        if (guarantee_index == 0) {
+          batch->values.emplace_back(std::make_shared<Int32Scalar>(23));
+        } else {
+          batch->values.emplace_back(std::make_shared<Int32Scalar>(47));
+        }

Review Comment:
   I address this in .
   
   I essentially change the invocation of the lambda to:
   ```cpp
   if (not guarantees.empty()) {
     auto extract_result = ExtractKnownFieldValues(guarantees[frag_ndx]);
     ARROW_WARN_NOT_OK(extract_result.status(), "ExtractKnownFieldValues failed");
     for (const auto& known_field : extract_result->map) {
       batches.back().values.emplace_back(known_field.second);
     }
   }
   ```
   
   ooh, but I just realized I used `not` instead of `!`. I'm not sure if there's a preference



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