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Since we mustn't force an initdb in released branches, there is no simple way to correct the markings of pg_subscription.subslotname and pg_subscription_rel.srsublsn as attnotnull in existing pre-v13 installations. Fortunately, released branches don't rely on attnotnull being correct for much. The planner looks at it in relation_excluded_by_constraints, but it'd be difficult to get that to matter for a query on a system catalog. The only place where it's really problematic is in JIT's slot_compile_deform(), which can produce incorrect code that crashes if there are NULLs in an allegedly not-null column. Hence, hack up slot_compile_deform() to be specifically aware of these two incorrect markings and not trust them. This applies to v11 and v12; the JIT code didn't exist before that, and we've fixed the markings in v13. Discussion: https://postgr.es/m/229396.1595191345@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/.