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Replica identities that depend directly on an index rely on a set of properties, one of them being that all the columns defined in this index have to be marked as NOT NULL. There was a hole in the logic with ALTER TABLE DROP NOT NULL, where it was possible to remove the NOT NULL property of a column part of an index used as replica identity, so block it to avoid problems with logical decoding down the road. The same check was already done columns part of a primary key, so the fix is straight-forward. Author: Haiying Tang, Hou Zhijie Reviewed-by: Dilip Kumar, Michael Paquier Discussion: https://postgr.es/m/OS0PR01MB6113338C102BEE8B2FFC5BD9FB619@OS0PR01MB6113.jpnprd01.prod.outlook.com Backpatch-through: 10
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/.