[jira] [Resolved] (DRILL-3435) Some reserved-keywords require table aliasing

["Kristine Hahn (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-3435?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kristine Hahn resolved DRILL-3435.
----------------------------------
    Resolution: Fixed

Fix published.

> Some reserved-keywords require table aliasing
> ---------------------------------------------
>
>                 Key: DRILL-3435
>                 URL: https://issues.apache.org/jira/browse/DRILL-3435
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Documentation
>    Affects Versions: 1.0.0
>            Reporter: Andy Pernsteiner
>            Assignee: Bridget Bevens
>            Priority: Minor
>              Labels: documentation
>
> Not only does drill have a number of reserved keywords that require backticking (``), there also appear to be some reserved words that require extra care, using table aliases to be able to perform queries.   One that we've found so far is 'user' .  EG, consider the following scenario:
> bq. /usr/bin/sqlline -u jdbc:drill: -n root
> then:
> {code} select user from `profiles/2aa32e9e-bdae-8949-8461-c14dafe63ee0.sys.drill` ;
> +-------+
> | user  |
> +-------+
> | root  |
> +-------+
> {code}
> But the actual file in question has the 'user' as a different user:
> {code} cat 2aa32e9e-bdae-8949-8461-c14dafe63ee0.sys.drill|egrep -o 'user\":\"[a-z]+\"'
> user":"apernsteiner"
> {code} 
> The workaround  is to alias the table (t) and prefix the 'user' column in the resultset w/ the table alias :
> {code}
> 0: jdbc:drill:> select t.`user` from `profiles/2aa32e9e-bdae-8949-8461-c14dafe63ee0.sys.drill` t ;
> +---------+
> |  user   |
> +---------+
> | apernsteiner  |
> +---------+
> {code}
> @jinfeng gave the following explanation on the user@ list:
> {quote}
> 'user' is a SQL reserved word.
> When it's used alone, it is a system function, just like CURRENT_USER.  See
> http://calcite.incubator.apache.org/docs/reference.html  (System functions
> section).
> When 'user' is qualified with a table alias, it becomes a column
> identifier. 
> {quote}
> The drill documentation @ https://drill.apache.org/docs/reserved-keywords/ merely says to use backticks (``), not to do any table aliasing.  For those who have columns named 'user', this may be misleading...



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