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ec63622c03
recurse_set_operations() uses the parse tree for the group number estimation, because of the "varno 0" hack. At the same time 2489d76c49 made root->parse and corresponding parent_root->simple_rte_array[]->subquery distinct copies of the parse tree, while d3d55ce571 introduced self-join removal replacing relid of removed relation only in one of the copies. The present commit fixes this bug by making recurse_set_operations() call estimate_num_groups() with the copy of the parse tree processed by self-join removal. In future, we may think about maintaining just one copy of the parse tree and/or keeping removed relids as aliases. Reported-by: Zuming Jiang Bug: #18170 Discussion: https://postgr.es/m/flat/18170-f1d17bf9a0d58b24%40postgresql.org Author: Richard Guo, Alexander Korotkov Reviewed-by: Andrei Lepikhov
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/.