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If we recursed to a new call of the same function, with a different coldeflist (AS clause), it would fail because the inner call would overwrite the outer call's idea of what to return. This is vaguely like 1d2fe56e4 and c5bec5426, but it's not due to any API decisions: it's just that we computed the actual output rowtype at the start of the call, and saved it in the per-procedure data structure. We can fix it at basically zero cost by doing the computation at the end of each call instead of the start. It's not clear that there's any real-world use-case for such a function, but given that it doesn't cost anything to fix, it'd be silly not to. Per report from Andreas Karlsson. Back-patch to all supported branches. Discussion: https://postgr.es/m/1651a46d-3c15-4028-a8c1-d74937b54e19@proxel.se
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/.