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Previously this was allowed, but the collation effectively vanished into the ether because of the way lookup_collation() works: you could not use the collation, nor even drop it. Seems better to give an error up front than to leave the user wondering why it doesn't work. (Because this test is in DefineCollation not CreateCollation, it does not prevent pg_import_system_collations from creating ICU collations, regardless of the initially-chosen encoding.) Per bug #17170 from Andrew Bille. Back-patch to v10 where ICU support was added. Discussion: https://postgr.es/m/17170-95845cf3f0a9c36d@postgresql.org |
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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/.