pg_policy
   The catalog pg_policy stores row-level
   security policies for tables.  A policy includes the kind of
   command that it applies to (possibly all commands), the roles that it
   applies to, the expression to be added as a security-barrier
   qualification to queries that include the table, and the expression
   to be added as a WITH CHECK option for queries that attempt to
   add new records to the table.
  
Table 53.38. pg_policy Columns
| Column Type Description | 
|---|
| 
        Row identifier | 
| 
        The name of the policy | 
| 
        The table to which the policy applies | 
| 
        
       The command type to which the policy is applied:
        | 
| 
        Is the policy permissive or restrictive? | 
| 
        
       The roles to which the policy is applied;
       zero means  | 
| 
        The expression tree to be added to the security barrier qualifications for queries that use the table | 
| 
        The expression tree to be added to the WITH CHECK qualifications for queries that attempt to add rows to the table | 
    Policies stored in pg_policy are applied only when
    pg_class.relrowsecurity is set for
    their table.