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Multiple calls to XMLTABLE in a query (e.g. laterally applying it to a table with an xml column, an important use-case) were leaking large amounts of memory into the per-query context, blowing up memory usage. Repair by reorganizing memory context usage in nodeTableFuncscan; use the usual per-tuple context for row-by-row evaluations instead of perValueCxt, and use the explicitly created context -- renamed from perValueCxt to perTableCxt -- for arguments and state for each individual table-generation operation. Backpatch to PG10 where this code was introduced. Original report by IRC user begriffs; analysis and patch by me. Reviewed by Tom Lane and Pavel Stehule. Discussion: https://postgr.es/m/153394403528.10284.7530399040974170549@wrigleys.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/.