mirror of
https://github.com/postgres/postgres.git
synced 2025-05-12 16:21:30 +03:00
f733219570
Generally, members of inheritance trees must be plain tables (or, in more recent versions, foreign tables). ALTER TABLE INHERIT rejects creating an inheritance relationship that has a view at either end. When DefineQueryRewrite attempts to convert a relation to a view, it already had checks prohibiting doing so for partitioning parents or children as well as traditional-inheritance parents ... but it neglected to check that a traditional-inheritance child wasn't being converted. Since the planner assumes that any inheritance child is a table, this led to making plans that tried to do a physical scan on a view, causing failures (or even crashes, in recent versions). One could imagine trying to support such a case by expanding the view normally, but since the rewriter runs before the planner does inheritance expansion, it would take some very fundamental refactoring to make that possible. There are probably a lot of other parts of the system that don't cope well with such a situation, too. For now, just forbid it. Per bug #16856 from Yang Lin. Back-patch to all supported branches. (In versions before v10, this includes back-patching the portion of commit 501ed02cf that added has_superclass(). Perhaps the lack of that infrastructure partially explains the missing check.) Discussion: https://postgr.es/m/16856-0363e05c6e1612fd@postgresql.org
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/.