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https://issues.apache.org/jira/browse/CASSANDRA-19749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17863791#comment-17863791
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Brandon Williams commented on CASSANDRA-19749:
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+1
> ALTER USER | ROLE IF EXISTS creates a user / role if it does not exist
> ----------------------------------------------------------------------
>
> Key: CASSANDRA-19749
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19749
> Project: Cassandra
> Issue Type: Bug
> Components: Legacy/CQL
> Reporter: Stefan Miklosovic
> Assignee: Stefan Miklosovic
> Priority: Normal
> Fix For: 4.1.x, 5.0.x, 5.x
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Let's have:
> {code}
> authenticator:
> class_name : org.apache.cassandra.auth.PasswordAuthenticator
> authorizer: CassandraAuthorizer
> role_manager: CassandraRoleManager
> {code}
> and do this:
> {code}
> cassandra@cqlsh> select * from system_auth.roles;
> role | can_login | is_superuser | member_of | salted_hash
> -----------+-----------+--------------+-----------+--------------------------------------------------------------
> cassandra | True | True | null |
> $2a$10$sFCKeluid5MlW/Z0CU1ygO1U5qpLW4Rgivmu8rZNmNNQ8WeC2y92S
> {code}
> Then
> {code}
> cassandra@cqlsh> ALTER USER IF EXISTS this_does_not_exist SUPERUSER ;
> cassandra@cqlsh> select * from system_auth.roles where role =
> 'this_does_not_exist';
> role | can_login | is_superuser | member_of | salted_hash
> ---------------------+-----------+--------------+-----------+-------------
> this_does_not_exist | null | True | null | null
> {code}
> It seems to be same behaviour for ALTER ROLE too.
> {code}
> cassandra@cqlsh> ALTER ROLE IF EXISTS this_role_is_not_there WITH SUPERUSER =
> true ;
> cassandra@cqlsh> select * from system_auth.roles where role =
> 'this_role_is_not_there';
> role | can_login | is_superuser | member_of | salted_hash
> ------------------------+-----------+--------------+-----------+-------------
> this_role_is_not_there | null | True | null | null
> {code}
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