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build_child_join_sjinfo creates a derived SpecialJoinInfo in the short-lived GEQO context, but afterwards the semi_rhs_exprs from that may be used in a UniquePath for a child base relation. This breaks the expectation that all base-relation-level structures are in the planning-lifespan context, leading to use of a dangling pointer with probable ensuing crash later on in create_unique_plan. To fix, copy the expression trees when making a UniquePath. Per bug #18360 from Alexander Lakhin. This has been broken since partitionwise joins were added, so back-patch to all supported branches. Discussion: https://postgr.es/m/18360-a23caf3157f34e62@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/.