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https://issues.apache.org/jira/browse/CALCITE-5681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17741870#comment-17741870
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hongyu guo commented on CALCITE-5681:
-------------------------------------

[~libenchao], Thank you for your response and for providing me with the 
guidelines. I apologize for tagging you in the JIRA case and I will make sure 
to follow the recommended process in the future.

> Support authorization via GRANT and REVOKE DDL commands
> -------------------------------------------------------
>
>                 Key: CALCITE-5681
>                 URL: https://issues.apache.org/jira/browse/CALCITE-5681
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Julian Hyde
>            Assignee: hongyu guo
>            Priority: Major
>              Labels: pull-request-available
>
> Support authorization via GRANT and REVOKE DDL commands.
> While CALCITE-2194 describes how authorization could be built into the schema 
> (e.g. user1 can see tables table1 and table2), it requires people to create 
> their own Schema objects. This feature would add GRANT and REVOKE commands to 
> the DDL parser in the "server" component.
> The syntax is TBD but would look something like this:
> {code:java}
> GRANT SELECT ON TABLE table1, table2 TO user1;
> REVOKE ALL ON table1 FROM user1; {code}
>  



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