fdda78e361
03d40e4b5 allowed dummy UNION [ALL] children to be removed from the plan by checking for is_dummy_rel(). That commit neglected to still account for the relids from the dummy rel so that the correct UPPERREL_SETOP RelOptInfo could be found and used for adding the Paths to. Not doing this could result in processing of subsequent UNIONs using the same RelOptInfo as a previously processed UNION, which could result in add_path() freeing old Paths that are needed by the previous UNION. The same fix was independently submitted (2 mins later) by Richard Guo. Reported-by: Alexander Lakhin <exclusion@gmail.com> Author: David Rowley <dgrowleyml@gmail.com> Discussion: https://postgr.es/m/bee34aec-659c-46f1-9ab7-7bbae0b7616c@gmail.com
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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.