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Most of our collations code has special handling for the locale names "C" and "POSIX", allowing those collations to be used whether or not the system libraries think those locale names are valid, or indeed whether said libraries even have any locale support. But we missed handling things that way in CREATE COLLATION. This meant you couldn't clone the C/POSIX collations, nor explicitly define a new collation using those locale names, unless the libraries allow it. That's pretty pointless, as well as being a violation of pg_newlocale_from_collation's API specification. The practical effect of this change is quite limited: it allows creating such collations even on platforms that don't HAVE_LOCALE_T, and it allows making "POSIX" collation objects on Windows, which before this would only let you make "C" collation objects. Hence, even though this is a bug fix IMO, it doesn't seem worth the trouble to back-patch. In passing, suppress the DROP CASCADE detail messages at the end of the collation regression test. I'm surprised we've never been bit by message ordering issues there. Per report from Murtuza Zabuawala. Discussion: https://postgr.es/m/CAKKotZS-wcDcofXDCH=sidiuajE+nqHn2CGjLLX78anyDmi3gQ@mail.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. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.