55.26. pg_shadow #
 The view pg_shadow exists for backwards compatibility: it emulates a catalog that existed in PostgreSQL before version 8.1. It shows properties of all roles that are marked as rolcanlogin in pg_authid. 
 The name stems from the fact that this table should not be readable by the public since it contains passwords. pg_user is a publicly readable view on pg_shadow that blanks out the password field. 
Table 55.26. pg_shadow Columns
Column Type Description  | 
|---|
 User name  | 
 ID of this user  | 
 User can create databases  | 
 User is a superuser  | 
 User can initiate streaming replication and put the system in and out of backup mode.  | 
 User bypasses every row-level security policy, see Section 5.9 for more information.  | 
  Encrypted password; null if none. See   | 
 Password expiry time (only used for password authentication)  | 
 Session defaults for run-time configuration variables  |