Robert Hou commented on DRILL-4692:

This has become issue when mapr customers want to read their audit logs.  One 
of the fields is "user".  Here is an example:



> Column named user unresolvable
> ------------------------------
>                 Key: DRILL-4692
>                 URL: https://issues.apache.org/jira/browse/DRILL-4692
>             Project: Apache Drill
>          Issue Type: Bug
>          Components:  Server
>    Affects Versions: 1.6.0
>            Reporter: John Omernik
>            Priority: Major
> With a set of Parquet files created outside of drill is attempted to be 
> processed in Drill, and that set of files contains a column named "user" it 
> is impossible to resolve that column, as Drill always replaces user with the 
> currently logged in user. 
> select user from table -> the logged in user
> select `user` from table -> the logged in user
> There is just no way to address that field. Backticks should allow us to 
> access that field.  

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