|PostgreSQL 8.2.6 Documentation|
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The view applicable_roles identifies all roles whose privileges the current user can use. This means there is some chain of role grants from the current user to the role in question. The current user itself is also an applicable role. The set of applicable roles is generally used for permission checking.
Table 32-3. applicable_roles Columns
|grantee||sql_identifier||Name of the role to which this role membership was granted (may be the current user, or a different role in case of nested role memberships)|
|role_name||sql_identifier||Name of a role|
|is_grantable||character_data||YES if the grantee has the admin option on the role, NO if not|