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Commit 44fe30fdab6 introduced the 'default_char_signedness' field in controlfile. Newly created database clusters always set this field to 'signed'. This change ensures that pg_upgrade updates the 'default_char_signedness' to 'unsigned' if the source database cluster has signedness=false. For source clusters from v17 or earlier, which lack the 'default_char_signedness' information, pg_upgrade assumes the source cluster was initialized on the same platform where pg_upgrade is running. It then sets the 'default_char_signedness' value according to the current platform's default character signedness. Reviewed-by: Noah Misch <noah@leadboat.com> Discussion: https://postgr.es/m/CB11ADBC-0C3F-4FE0-A678-666EE80CBB07%40amazon.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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.