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Most of the infrastructure for procedure arguments was already okay with polymorphic output arguments, but it turns out that CallStmtResultDesc() was a few bricks shy of a load here. It thought all it needed to do was call build_function_result_tupdesc_t, but that function specifically disclaims responsibility for resolving polymorphic arguments. Failing to handle that doesn't seem to be a problem for CALL in plpgsql, but CALL from plain SQL would get errors like "cannot display a value of type anyelement", or even crash outright. In v14 and later we can simply examine the exposed types of the CallStmt.outargs nodes to get the right type OIDs. But it's a lot more complicated to fix in v12/v13, because those versions don't have CallStmt.outargs, nor do they do expand_function_arguments until ExecuteCallStmt runs. We have to duplicatively run expand_function_arguments, and then re-determine which elements of the args list are output arguments. Per bug #18463 from Drew Kimball. Back-patch to all supported versions, since it's busted in all of them. Discussion: https://postgr.es/m/18463-f8cd77e12564d8a2@postgresql.org |
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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/.