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The finalfunc might return a read-write expanded object. If we de-duplicate multiple call sites for the aggregate, any function(s) receiving the aggregate result earlier could alter or destroy the value that reaches the ones called later. This is a brown-paper-bag bug in commit 42b746d4c, because we actually considered the need for read-only-ness but failed to realize that it applied to the case with a finalfunc as well as the case without. Per report from Justin Pryzby. New error in HEAD, no need for back-patch. Discussion: https://postgr.es/m/ZDm5TuKsh3tzoEjz@telsasoft.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/.