westonpace commented on a change in pull request #10636:
URL: https://github.com/apache/arrow/pull/10636#discussion_r662706520



##########
File path: cpp/src/arrow/dataset/file_parquet.cc
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@@ -868,6 +868,7 @@ Result<std::shared_ptr<DatasetFactory>> 
ParquetDatasetFactory::Make(
   ARROW_ASSIGN_OR_RAISE(auto manifest, GetSchemaManifest(*metadata, 
properties));
 
   std::unordered_map<std::string, std::vector<int>> path_to_row_group_ids;
+  std::vector<std::string> ordered_paths;

Review comment:
       I went ahead and switched to this.




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