f69319f2f1
The builtin C.UTF-8 locale has similar semantics to the libc locale of the same name. That is, code point sort order (fast, memcmp-based) combined with Unicode semantics for character operations such as pattern matching, regular expressions, and LOWER()/INITCAP()/UPPER(). The character semantics are based on Unicode simple case mappings. The builtin provider's C.UTF-8 offers several important advantages over libc: * faster sorting -- benefits from additional optimizations such as abbreviated keys and varstrfastcmp_c * faster case conversion, e.g. LOWER(), at least compared with some libc implementations * available on all platforms with identical semantics, and the semantics are stable, testable, and documentable within a given Postgres major version Being based on memcmp, the builtin C.UTF-8 locale does not offer natural language sort order. But it is an improvement for most use cases that might otherwise use libc's "C.UTF-8" locale, as well as many use cases that use libc's "C" locale. Discussion: https://postgr.es/m/ff4c2f2f9c8fc7ca27c1c24ae37ecaeaeaff6b53.camel%40j-davis.com Reviewed-by: Daniel Vérité, Peter Eisentraut, Jeremy Schneider |
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| config | ||
| contrib | ||
| doc | ||
| src | ||
| .cirrus.star | ||
| .cirrus.tasks.yml | ||
| .cirrus.yml | ||
| .dir-locals.el | ||
| .editorconfig | ||
| .git-blame-ignore-revs | ||
| .gitattributes | ||
| .gitignore | ||
| aclocal.m4 | ||
| configure | ||
| configure.ac | ||
| COPYRIGHT | ||
| GNUmakefile.in | ||
| HISTORY | ||
| Makefile | ||
| meson.build | ||
| meson_options.txt | ||
| README.md | ||
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/.