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As of commit 37a795a60, populate_recordset_worker() tried to pass back (as rsi.setDesc) a tupdesc that it also had cached in its fn_extra. But the core executor would free the passed-back tupdesc, risking a crash if the function were called again in the same query. The safest and least invasive way to fix that is to make an extra tupdesc copy to pass back. While at it, I failed to resist the temptation to get rid of unnecessary get_fn_expr_argtype() calls here and in populate_record_worker(). Per report from Dmitry Dolgov; thanks to Michael Paquier and Andrew Gierth for investigation and discussion. Discussion: https://postgr.es/m/CA+q6zcWzN9ztCfR47ZwgTr1KLnuO6BAY6FurxXhovP4hxr+yOQ@mail.gmail.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/.