pitrou commented on PR #36499:
URL: https://github.com/apache/arrow/pull/36499#issuecomment-1623653653

   I also don't understand why you call `Invalidate` explicitly, while the 
`KeyHasher` is supposed to invalidate automatically.
   
   However, I see that `KeyHasher` is storing a raw `RecordBatch` pointer, 
which is problematic. If the previous `std::shared_ptr<RecordBatch>` was 
destroyed, another `std::shared_ptr<RecordBatch>` could re-allocate the same 
underlying `RecordBatch` pointer, which is unlikely but not impossible.
   
   Am I missing something here?


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