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From "Mamta A. Satoor (JIRA)" <derby-...@db.apache.org>
Subject [jira] Created: (DERBY-1632) When a revoke privilege is issued, the affected objects before dropping themselves should see if there is any other replacement privilege
Date Wed, 02 Aug 2006 05:02:13 GMT
When a revoke privilege is issued, the affected objects before dropping themselves should see
if there is any other replacement privilege
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                 Key: DERBY-1632
                 URL: http://issues.apache.org/jira/browse/DERBY-1632
             Project: Derby
          Issue Type: Improvement
          Components: Documentation, SQL
    Affects Versions: 10.2.0.0
            Reporter: Mamta A. Satoor


Currently, when an object (trigger/constraint/view) is created, it depends on the available
required privilege at the user level. If none found, it depends on the available required
privilege at PUBLIC level. If none exist both at user level or PUBLIC level, then create object
fails.

To reiterate, if the privilege is found say at the user level, the object depends on that
privilege. Consider the case, where the privilege also exist at the PUBLIC level. Later, when
a revoke privilege is issued at the user level, the dependent object gets a revoke invalidation
action and the dependent object drops itself. Instead, the dependent object should make itself
depend on the PUBLIC level privilege. This does not happen in Derby at this point and would
be a very useful feature.

eg for the problem at hand
user1
create table t1
grant select on t1 to user2, public
user2
create view v1 as select * from user1.t1
-- this view will depend on the user level select privilege on table t1
user1
revoke select on t1 from user2
-- this revoke will end up dropping the view. The view could have made itself depend on the
PUBLIC level select privilege
--  on t1 but that doesn't happen currently

another eg for the same problem
user1
create table t1
grant select on t1 to public
user2
create view v1 as select * from user1.t1
-- this view will depend on the PUBLIC level select privilege on table t1
user1
grant select on to to user2
revoke select on t1 from public
-- this revoke ends up dropping the view user2.v1 eventhough there is a user level SELECT
privilege availble
--  on user1.t1

So, in brief, the problem is that when a dependent object gets a revoke invalidation action,
it does not check if there is another privilege available to replace the privilege being revoked.
Instead, they just go ahead and drop themselves.

Until we fix this behavior, we should document it so the user will know what to expect for
same privilege being available at different levels.

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