Operator ~ on type aclitem in pgsql 7.2

Iam testing postgresql 7.2

In postgres 6.5 i used the ~ Operator on type aclitem to search:

has user xyz the permisssion x on table x ?

This is useful to disable update-buttons in the GUI for users

who have only read-permissions.

with the following command as example

select
relname
, relacl
from
pg_class
where
relacl ~ 'nobody=r'::aclitem

and

relname = 'tab1'

;

In 7.2 this command only is successful if r is the only permission

of nobody on the table. To show the effect the following commands:

relname | relacl
---------+------------------------------------
tab1 | {=,probost=arwdRxt,nobody=r}
tab2 | {=,probost=arwdRxt,nobody=arwdRxt}
tab3 | {=,probost=arwdRxt,nobody=r}
(3 rows)

select relname
, relacl
from
pg_class
where
relkind ='r'
and
relname !~ '^pg_'
relname | relacl
---------+------------------------------
tab1 | {=,probost=arwdRxt,nobody=r}
tab3 | {=,probost=arwdRxt,nobody=r}
(2 rows)

select
relname
, relacl
from
pg_class
where
relacl ~ 'nobody=r'::aclitem

;

May I change the syntax of the sql ?

is this an error ?

is there another possibility to reply to the above question ?

--
MfG

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- Karin Probost
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