a13833c35f
Instead of having five separate GUC structs, one for each type, with the generic part contained in each of them, flip it around and have one common struct, with the type-specific part has a subfield. The very original GUC design had type-specific structs and type-specific lists, and the membership in one of the lists defined the type. But now the structs themselves know the type (from the .vartype field), and they are all loaded into a common hash table at run time, and so this original separation no longer makes sense. It creates a bunch of inconsistencies in the code about whether the type-specific or the generic struct is the primary struct, and a lot of casting in between, which makes certain assumptions about the struct layouts. After the change, all these casts are gone and all the data is accessed via normal field references. Also, various code is simplified because only one kind of struct needs to be processed. Reviewed-by: Chao Li <li.evan.chao@gmail.com> Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi> Discussion: https://www.postgresql.org/message-id/flat/8fdfb91e-60fb-44fa-8df6-f5dea47353c9@eisentraut.org
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/.