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Some code paths in this function perform syscache lookups, which can lead to table accesses and possibly leakage of cruft into the caller's context. If said context is CacheMemoryContext, we eventually will have visible bloat. But fixing this is no harder than moving one memory context switch step. (The other callers don't have a problem.) Andres Freund and I independently found this via valgrind testing. Back-patch to v12 where this code was added. Discussion: https://postgr.es/m/20210317023101.anvejcfotwka6gaa@alap3.anarazel.de Discussion: https://postgr.es/m/3816764.1616104288@sss.pgh.pa.us |
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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/.