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Commits 84f5c2908 et al missed the need to cover plpgsql's "simple expression" code path. If the first thing we execute after a COMMIT/ROLLBACK is one of those, rather than a full-fledged SPI command, we must explicitly do EnsurePortalSnapshotExists() to make sure we have an outer snapshot. Note that it wouldn't be good enough to just push a snapshot for the duration of the expression execution: what comes back might be toasted, so we'd better have a snapshot protecting it. The test case demonstrating this fact cheats a bit by marking a SQL function immutable even though it fetches from a table. That's nothing that users haven't been seen to do, though. Per report from Jim Nasby. Back-patch to v11, like the previous fix. Discussion: https://postgr.es/m/378885e4-f85f-fc28-6c91-c4d1c080bf26@amazon.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/.