kerwin-zk commented on code in PR #10235:
URL: 
https://github.com/apache/incubator-gluten/pull/10235#discussion_r2219668764


##########
cpp/velox/shuffle/VeloxRssSortShuffleWriter.h:
##########
@@ -108,6 +118,10 @@ class VeloxRssSortShuffleWriter final : public 
VeloxShuffleWriter {
   uint32_t currentInputColumnBytes_ = 0;
 
   RssSortState sortState_{kSortInit};
+
+  // The existing string buffers in the current batches.
+  std::unordered_set<facebook::velox::Buffer*> stringBuffers_;

Review Comment:
   It would be better to use  ```folly::F14FastSet<const Buffer*>```



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