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When looping around after finding that the set-returning function returned zero rows for the current input tuple, ExecProjectSet neglected to reset either of the two memory contexts it's responsible for cleaning out. Typically this wouldn't cause much problem, because once the SRF does return at least one row, the contexts would get reset on the next call. However, if the SRF returns no rows for many input tuples in succession, quite a lot of memory could be transiently consumed. To fix, make sure we reset both contexts while looping around. Per bug #18172 from Sergei Kornilov. Back-patch to all supported branches. Discussion: https://postgr.es/m/18172-9b8c5fc1d676ded3@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/.