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The code for conversions SQL_ASCII <-> MULE_INTERNAL and SQL_ASCII <-> UTF8 was unreachable, because we long ago changed the wrapper functions pg_do_encoding_conversion() et al so that they have hard-wired behaviors for conversions involving SQL_ASCII. (At least some of those fast paths date back to 2002, though it looks like we may not have been totally consistent about this until later.) Given the lack of complaints, nobody is dissatisfied with this state of affairs. Hence, let's just remove the unreachable code. Also, change CREATE CONVERSION so that it rejects attempts to define such conversions. Since we consider that SQL_ASCII represents lack of knowledge about the encoding in use, such a conversion would be semantically dubious even if it were reachable. Adjust a couple of regression test cases that had randomly decided to rely on these conversion functions rather than any other ones. Discussion: https://postgr.es/m/41163.1559156593@sss.pgh.pa.us
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/.