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For GiST, having a sortsupport function allows building the index using the "sorted build" method, which is much faster. For b-tree, the sortsupport routine doesn't give any new functionality, but speeds up sorting a tiny bit. The difference is not very significant, about 2% in cursory testing on my laptop, because the range type comparison function has quite a lot of overhead from detoasting. In any case, since we have the function for GiST anyway, we might as well register it for the btree opfamily too. Author: Bernd Helmle <mailings@oopsware.de> Discussion: https://www.postgresql.org/message-id/64d324ce2a6d535d3f0f3baeeea7b25beff82ce4.camel@oopsware.de
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/.