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Previously the funcCtx was a child of the tmpCtx, but that was broken by commit eaa5808e8ec4e82ce1a87103a6b6f687666e4e4c, which made MemoryContextReset() delete, not reset, child contexts. The behavior of having a tmpCtx reset also clear the other context seems rather dubious anyway, so let's just disentangle them. Per report from Erik Rijkers. In passing, fix badly-inaccurate comments about these contexts.
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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.