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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