mirror of
https://github.com/postgres/postgres.git
synced 2025-11-24 00:23:06 +03:00
b85397481c
The fix for bug #19055 (commitb0cc0a71e) allowed CTE references in sub-selects within aggregate functions to affect the semantic levels assigned to such aggregates. It turns out this broke some related cases, leading to assertion failures or strange planner errors such as "unexpected outer reference in CTE query". After experimenting with some alternative rules for assigning the semantic level in such cases, we've come to the conclusion that changing the level is more likely to break things than be helpful. Therefore, this patch undoes whatb0cc0a71echanged, and instead installs logic to throw an error if there is any reference to a CTE that's below the semantic level that standard SQL rules would assign to the aggregate based on its contained Var and Aggref nodes. (The SQL standard disallows sub-selects within aggregate functions, so it can't reach the troublesome case and hence has no rule for what to do.) Perhaps someone will come along with a legitimate query that this logic rejects, and if so probably the example will help us craft a level-adjustment rule that works better than whatb0cc0a71edid. I'm not holding my breath for that though, because the previous logic had been there for a very long time before bug #19055 without complaints, and that bug report sure looks to have originated from fuzzing not from real usage. Likeb0cc0a71e, back-patch to all supported branches, though sadly that no longer includes v13. Bug: #19106 Reported-by: Kamil Monicz <kamil@monicz.dev> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/19106-9dd3668a0734cd72@postgresql.org Backpatch-through: 14
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/.