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When we invented arrays of composite types (commit bc8036fc6), we excluded system catalogs, basically just on the grounds of not wanting to bloat pg_type. However, it's definitely inconsistent that catalogs' composite types can't be put into arrays when others can. Another problem is that the exclusion is done by checking IsUnderPostmaster in heap_create_with_catalog, which means that (1) If a user tries to create a table in single-user mode, it doesn't get an array type. That's bad in itself, plus it breaks pg_upgrade. (2) If someone drops and recreates a system view or information_schema view (as we occasionally recommend doing), it will now have an array type where it did not before, making for still more inconsistency. So this is all pretty messy. Let's just get rid of the inconsistency and decree that system-created relations should have array types if similar user-created ones would, i.e. it only depends on the relkind. As of HEAD, that means that the initial contents of pg_type grow from 411 rows to 605, which is a lot of growth percentage-wise, but it's still quite a small catalog compared to others. Wenjing Zeng, reviewed by Shawn Wang, further hacking by me Discussion: https://postgr.es/m/761F1389-C6A8-4C15-80CE-950C961F5341@gmail.com
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/.