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Matviews have been discarded from needing predicate locks since 3bf3ab8 and their introduction. At this point, there was no concurrent flavor of REFRESH yet, hence there was no meaning in having materialized views look at read/write conflicts with concurrent transactions using themselves the serializable isolation level because they could only be refreshed with an access exclusive lock. CONCURRENTLY, on the contrary, allows reads and writes during a refresh as it holds a share update exclusive lock. Some isolation tests are added to show the effect of the change, with a combination of one table and a matview based on it, using a mix of REFRESH CONCURRENTLY and read/write queries. This could arguably be considered as a bug, but as it is a subtle behavior change potentially impacting applications no backpatch is done. Author: Yugo Nagata Reviewed-by: Richard Guo, Dilip Kumar, Michael Paquier Discussion: https://postgr.es/m/20220726164434.42d4e33911b4b4fcf751c4e7@sraoss.co.jp
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/.