Shuo Cheng created HUDI-9469:
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             Summary: Refactor getting hoodieRecord iterator for file group 
reader
                 Key: HUDI-9469
                 URL: https://issues.apache.org/jira/browse/HUDI-9469
             Project: Apache Hudi
          Issue Type: Improvement
          Components: core
            Reporter: Shuo Cheng
             Fix For: 1.1.0


Currently, `getClosableHoodieRecordIterator` and `getClosableKeyIterator` will 
incur redundant record conversion from `BufferedRecord` <--> engine record. We 
can make some minor refactor to get the iterator more efficiently, e.g., 
providing an method `getBufferedRecordIterator`, then implement 
`getClosableIterator`, `getClosableHoodieRecordIterator` and 
`getClosableKeyIterator` based on it.



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