97b0f36bde
For a child relation, we should not assume that its parent's unique-ified relation (or unique-ified path in v18) always exists. In cases where all RHS columns that need to be unique-ified are equated to constants, the unique-ified relation/path for the parent table is not built, as there are no columns left to unique-ify. Failing to account for this can result in a SIGSEGV crash during planning. This patch checks whether the parent's unique-ified relation or path exists and skips unique-ification of the child relation if it does not. Author: Richard Guo <guofenglinux@gmail.com> Discussion: https://postgr.es/m/CAMbWs49MOdLW2c+qbLHHBt8VBu=4ONpM91D19=AWeW93eFUF6A@mail.gmail.com Backpatch-through: 18
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/.