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The comment is no longer accurate, and hasn't been entirely accurate since Hot Standby was introduced. The original idea here was that StartupCLOG() wouldn't be called until the end of recovery and therefore this value would be uninitialized when this code is reached, but Hot Standby made that true only when hot_standby=off, and commit 1f113abdf87cd085dee3927960bb4f70442b7250 means that this value is now always initialized before replay even starts. The original purpose of this code was to bypass the sanity check in SimpleLruTruncate(), which will no longer occur: now, if something is wrong, that sanity check might trip during recovery. That's probably a good thing, because in the current code base latest_page_number should always be initialized and therefore we expect that the sanity check should pass. If it doesn't, something has gone wrong, and complaining about it is appropriate. Patch by me, reviewed by Heikki Linnakangas. Discussion: http://postgr.es/m/CA+TgmoZYig9+AQodhF5sRXuKkJ=RgFDugLr3XX_dz_F-p=TwTg@mail.gmail.com
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: https://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. 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 https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.