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Since the size of the string representation of an uuid is fixed, there is no benefit in using a StringInfo. This commit simplifies uuid_oud() to not rely on a StringInfo, where avoiding the overhead of the string manipulation makes the function substantially faster. A COPY TO on a relation with one UUID attribute can show up to a 40% speedup when the bottleneck is the COPY computation with uuid_out() showing up at the top of the profiles (numbered measure here, Laurenz has mentioned something closer to 20% faster runtimes), for example when the data is fully in shared buffers or the OS cache. Author: Laurenz Albe Reviewed-by: Andres Freund, Michael Paquier Description: https://postgr.es/m/679d5455cbbb0af667ccb753da51a475bae1eaed.camel@cybertec.at
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/.