lidavidm commented on a change in pull request #9725:
URL: https://github.com/apache/arrow/pull/9725#discussion_r596906287



##########
File path: cpp/src/arrow/dataset/scanner.h
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@@ -240,6 +240,9 @@ class ARROW_DS_EXPORT ScannerBuilder {
   /// \brief Set the pool from which materialized and scanned arrays will be 
allocated.
   Status Pool(MemoryPool* pool);
 
+  /// \brief Set fragment-specific scan options.
+  Status FragmentScanOptions(std::shared_ptr<FragmentScanOptions> 
fragment_scan_options);

Review comment:
       Ah, I see…hmm, but if we had a hypothetical FlightFragment, we'd still 
want to have scan options specific to that fragment, right?




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