89e06d7829
Self-join elimination failed to check for inheritance cases, which has two big problems. First, a unique index on the parent table isn't sufficient to prove uniqueness across its children too. Second, since we matched RTEs by OID without considering rte->inh, we could try to merge "mytable" with "mytable ONLY", which doesn't even represent the same set of rows. We can fix both issues by just skipping RTEs that have inh set. preprocess_relation_rtes already cleared that flag for tables known not to have inheritance children, so this doesn't break SJE for the cases where it's valid. Author: Tender Wang <tndrwang@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAHewXNn4EjCQEvanN_FPKQ3OJWaBXq8Pxcj-DZYbeQ6_4xSFgw@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/.