wuyi created SPARK-31425:
----------------------------

             Summary: UnsafeKVExternalSorter should also respect 
UnsafeAlignedOffset
                 Key: SPARK-31425
                 URL: https://issues.apache.org/jira/browse/SPARK-31425
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.1.0
            Reporter: wuyi


Since BytesToBytesMap respects UnsafeAlignedOffset when writing the record, 
UnsafeKVExternalSorter should also respect UnsafeAlignedOffset when reading the 
record otherwise it will causes a data correctness issue.



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