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Having rejected the principle that we should know how to re-order the sub-commands of CREATE SCHEMA, there is not really anything except a little coding to stop us from supporting more object types. This patch adds support for creating functions (including procedures and aggregates), operators, types (including domains), collations, and text search objects. SQL:2021 specifies that we should allow functions, procedures, types, domains, and collations, so this moves us a great deal closer to full SQL compatibility of CREATE SCHEMA. What remains missing from their list are casts, transforms, roles, and some object types we don't support yet (e.g. CREATE CHARACTER SET). Supporting casts or transforms would be problematic because they don't have names at all, let alone schema-qualified names, so it'd be quite a stretch to say that they belong to a schema. Roles likewise are not schema-qualified, plus they are global to a cluster, making it even less reasonable to consider them as belonging to a schema. So I don't see us trying to complete the list. User-defined aggregates and operators are outside the spec's ken, as are text search objects, so adding them does not do anything for spec compatibility. But they go along with these other object types, plus it takes no additional code to support them since they are represented as DefineStmts like some variants of CREATE TYPE. It would indeed take some effort to reject them. Author: Kirill Reshke <reshkekirill@gmail.com> Author: Jian He <jian.universality@gmail.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CALdSSPh4jUSDsWu3K58hjO60wnTRR0DuO4CKRcwa8EVuOSfXxg@mail.gmail.com |
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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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.