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For a long time, our outfuncs.c code has supposed that the string contents of a BitString node could just be printed literally with no concern for quoting/escaping. Now, that's okay if the string literal contains only valid binary or hex digits ... but our lexer doesn't check that, preferring to let bitin() be the sole authority on what's valid. So we could have raw parse trees that contain incorrect BitString literals, and that can result in failures when WRITE_READ_PARSE_PLAN_TREES debugging is enabled. Fix by using outToken() to print the string field, and debackslash() to read it. This results in a change in the emitted representation only in cases that would have failed before, and don't represent valid SQL in the first place. Between that and the fact that we don't store raw parse trees in the catalogs, I judge this safe to apply without a catversion bump. Per bug #18340 from Alexander Lakhin. Back-patch to v16; before that, we lacked readfuncs support for BitString nodes, so that the problem was only cosmetic. Discussion: https://postgr.es/m/18340-4aa1ae6ed4121912@postgresql.org
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/.