westonpace commented on code in PR #13518:
URL: https://github.com/apache/arrow/pull/13518#discussion_r920364266


##########
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:
   This seems like a spot-fix.  Perhaps a more general fix would be to fix the 
`DatasetAndBatchesFromJSON` function?



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