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Previously, a byte with the high bit set was just transmitted as-is by charin() and charout(). This is problematic if the database encoding is multibyte, because the result of charout() won't be validly encoded, which breaks various stuff that expects all text strings to be validly encoded. We've previously decided to enforce encoding validity rather than try to individually harden each place that might have a problem with such strings, so it's time to do something about "char". To fix, represent high-bit-set characters as \ooo (backslash and three octal digits), following the ancient "escape" format for bytea. charin() will continue to accept the old way as well, though that is only reachable in single-byte encodings. Add some test cases just so there is coverage for this code. We'll otherwise leave this question undocumented as it was before, because we don't really want to encourage end-user use of "char". For the moment, back-patch into v15 so that this change appears in 15beta3. If there's not great pushback we should consider absorbing this change into the older branches. Discussion: https://postgr.es/m/2318797.1638558730@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/.