regression=# SELECT oid,* from pg_database;
  oid  |  oid  |  datname   | datdba | encoding | datcollate  |  datctype   | datistemplate | datallowconn | datconnlimit | datlastsysoid | datfrozenxid | datminmxid | dattablespace |               datacl                
-------+-------+------------+--------+----------+-------------+-------------+---------------+--------------+--------------+---------------+--------------+------------+---------------+-------------------------------------
 13593 | 13593 | postgres   |     10 |        6 | zh_CN.UTF-8 | zh_CN.UTF-8 | f             | t            |           -1 |         13592 |          479 |          1 |          1663 | 
 16384 | 16384 | tpch1s     |     10 |        6 | zh_CN.UTF-8 | zh_CN.UTF-8 | f             | t            |           -1 |         13592 |          479 |          1 |          1663 |