cgivre opened a new pull request #2069:
URL: https://github.com/apache/drill/pull/2069


   # [DRILL-7723](https://issues.apache.org/jira/browse/DRILL-7723): Add Excel 
Metadata as Implicit Fields
   
   ## Description
   
   Excel files contain a significant number of metadata fields in them. This PR 
adds the ability to access these fields via implicit columns. The columns are:
   
   ```
   _category
   _content_status
   _content_type;
   _creator
   _description
   _identifier
   _keywords
   _last_modified_by_user
   _revision
   _subject
   _title
   _created
   _last_printed
   _modified
   ```
   These fields are not projected in star queries so there is no effect on 
existing queries.
   
   ## Documentation
   Updated the `README.md` file with the implicit field information.
   
   ## Testing
   Added a unit test for the metadata fields.
   


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