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Future patches are expected to introduce logical replication that works by decoding WAL. WAL contains relfilenodes rather than relation OIDs, so this infrastructure will be needed to find the relation OID based on WAL contents. If logical replication does not make it into this release, we probably should consider reverting this, since it will add some overhead to DDL operations that create new relations. One additional index insert per pg_class row is not a large overhead, but it's more than zero. Another way of meeting the needs of logical replication would be to the relation OID to WAL, but that would burden DML operations, not only DDL. Andres Freund, with some changes by me. Design review, in earlier versions, by Álvaro Herrera.
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Changes between all PostgreSQL releases are recorded in the file HISTORY. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.