Re: docs: note ownership requirement for refreshing materialized views

> On Aug 16, 2018, at 1:05 AM, Jonathan S. Katz <jonathan(dot)katz(at)excoventures(dot)com> wrote:
>
>>
>> On Aug 15, 2018, at 9:15 PM, Michael Paquier <michael(at)paquier(dot)xyz> wrote:
>>
>> On Wed, Aug 15, 2018 at 09:06:34PM -0400, Jonathan S. Katz wrote:
>>> I played around with this feature a bit and did see this was the case.
>>> Also while playing around I noticed the error message was as such:
>>>
>>> test=> REFRESH MATERIALIZED VIEW blah;
>>> ERROR: must be owner of relation blah
>>>
>>> But it’s not a relation, it’s a materialized view. I attached a patch
>>> that I think should fix this. Kudos to Dave Cramer who was
>>> sitting next to me helping me to locate files and confirm assumptions.
>>
>> A relation may be a materialized view, no? The ACL check happens in
>> RangeVarCallbackOwnsTable by the way (look at ExecRefreshMatView in
>> matview.c).
>
> Comment on the RangeVarCallbackOwnsTable func (abbr):
>
> /*
> * This is intended as a callback for RangeVarGetRelidExtended(). It allows
> * the relation to be locked only if (1) it's a plain table, materialized
> * view, or TOAST table and (2) the current user is the owner (or the
> * superuser). This meets the permission-checking needs of CLUSTER, REINDEX
> * TABLE, and REFRESH MATERIALIZED VIEW; we expose it here so that it can be
> * used by all.
> */
>
> So it’s sharing the permission checking needs amongst all of those commands.
>
> As a user I could be confused if I saw the above error message, esp. because
> the behavior of REFRESH .. is specific to materialized views.

With encouragement from Dave, let me demonstrate what the proposed patch
does to fix the behavior. The steps, running from my “jkatz” user:

CREATE ROLE bar LOGIN;
CREATE TABLE a (x int);
CREATE MATERIALIZED VIEW b AS SELECT * FROM a;
\c - bar
REFRESH MATERIALIZED VIEW b;
ERROR: must be owner of materialized view b

vs. the existing error message which I posted further upthread.

Thanks,

Jonathan