Sometimes I want to save in a table reference to another table's name. E.g. I am creating an accounting system which (on triggers) logs which record is changed and in which table:
CREATE TABLE log( tbl XXX, id INTEGER, blahblah );
Nowadays XXX may be: 1) Table name. But it is quite inefficient by disk usage. Another bad thing: if I rename a table, I have to rename all rows in log table. 2) Table OID. It is very bad for pg_dump: after the restoration log table will be unusable. 3) ENUM with all table names. But I have to add an element to ENUM each time I create a new table, and, if I rename a table, I have to rename an ENUM element too.
So it would be very useful if Postgres has a special, system ENUM (e.g. pg_catalog.table_names_enum) which holds names of all tables in the database (format: schema.table), and their elements are automatically renamed when a table is renamed.