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This field was added in commit 0164a0f9ee to provide a way to determine whether a storage parameter was explicitly set for the relation or if it just picked up the default value. In most cases, this can be accomplished by giving the storage parameter a special out-of-range default value (e.g., the autovacuum_vacuum_insert_threshold storage parameter defaults to -2), but this approach doesn't work in all cases. For example, a Boolean storage parameter cannot be given an out-of-range default, so we need another way to discover the source of its value. Reported-by: "David G. Johnston" <david.g.johnston@gmail.com> Reviewed-by: "David G. Johnston" <david.g.johnston@gmail.com> Discussion: https://postgr.es/m/CAKFQuwYKtEUYKS%2B18gRs-xPhn0qOJgM2KGyyWVCODHuVn9F-XQ%40mail.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.
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/.