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https://issues.apache.org/jira/browse/CASSANDRA-10022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14679071#comment-14679071
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Aleksey Yeschenko commented on CASSANDRA-10022:
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I'm afraid this wouldn't work. We would still require you to have the 
{{MODIFY}} permission to run those queries (if anything, for compatibility 
reasons), and if you have {{MODIFY}}, then you'll be able to omit {{IF NOT 
EXIST}} and do anything anyway.

Perhaps CASSANDRA-8303 is what you really need. Give a role {{MODIFY}} 
permission, but take away the right to perform non-LWT updates.

> Add INSERT permission
> ---------------------
>
>                 Key: CASSANDRA-10022
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10022
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Vovodroid
>
> Hi,
> currently there is MODIFY permission in C*. It would be nice to add specific 
> INSERT permission, that would act as 'IF NOT EXIST' option specified.
> Imagine distributed application (e.g. mobile), that each its instance should 
> add something to table, but shouldn't be able to alter/delete existing data.
> Regards.



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