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This routine is designed to never return an empty description or NULL, providing description fallbacks even if missing objects are accepted, but it included a code path where this was considered possible. All the callers of this routine already consider NULL as not possible, so change a bit the code to map with the assumptions of the callers, and add more comments close to the callers of this routine to outline the behavior expected. This code is new as of 2a10fdc, so no backpatch is needed. Discussion: https://postgr.es/m/YMNY6RGPBRCeLmFb@paquier.xyz
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/.