Charles Givre created DRILL-8108:
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             Summary: Excel Reader Fails with Duplicate Columns
                 Key: DRILL-8108
                 URL: https://issues.apache.org/jira/browse/DRILL-8108
             Project: Apache Drill
          Issue Type: Bug
          Components: Storage - Other
            Reporter: Charles Givre
            Assignee: Charles Givre


In its current implementation, if Drill encounters an Excel file which contains 
duplicate column names, it will fail to read the data.   This PR fixes this 
issue by appending `_n` after the duplicate column.  



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