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Before commit 84f5c2908, a STABLE function in a plpgsql CALL statement's argument list would see an up-to-date snapshot, because exec_stmt_call would push a new snapshot. I got rid of that because the possibility of the snapshot disappearing within COMMIT made it too hard to manage a snapshot across the CALL statement. That's fine so far as the procedure itself goes, but I forgot to think about the possibility of STABLE functions within the CALL argument list. As things now stand, those'll be executed with the Portal's snapshot as ActiveSnapshot, keeping them from seeing updates more recent than Portal startup. (VOLATILE functions don't have a problem because they take their own snapshots; which indeed is also why the procedure itself doesn't have a problem. There are no STABLE procedures.) We can fix this by pushing a new snapshot transiently within ExecuteCallStmt itself. Popping the snapshot before we get into the procedure proper eliminates the management problem. The possibly-useless extra snapshot-grab is slightly annoying, but it's no worse than what happened before 84f5c2908. Per bug #17199 from Alexander Nawratil. Back-patch to v11, like the previous patch. Discussion: https://postgr.es/m/17199-1ab2561f0d94af92@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/.