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The code has always set this column to NULL when it's not valid, but the catalog header's description failed to reflect that, as did the SGML docs, as did some of the code. To prevent future coding errors of the same ilk, let's hide the field from C code as though it were variable-length (which, in a sense, it is). As with commit 72eab84a5, we can only fix this cleanly in HEAD and v13; the problem extends further back but we'll need some klugery in the released branches. Discussion: https://postgr.es/m/367660.1595202498@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/.
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