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group_keys_reorder_by_pathkeys() function searched for matching pathkeys within root->group_pathkeys. That could lead to picking an aggregate pathkey and using its pathkey->pk_eclass->ec_sortref as an argument of get_sortgroupref_clause_noerr(). Given that ec_sortref of an aggregate pathkey references aggregate targetlist not query targetlist, this leads to incorrect query optimization. Fix this by looking for matching pathkeys only within the first num_groupby_pathkeys pathkeys. Reported-by: David G. Johnston Discussion: https://postgr.es/m/CAKFQuwY3Ek%3DcLThgd8FdaSc5JRDVt0FaV00gMcWra%2BTAR4gGUw%40mail.gmail.com Author: Andrei Lepikhov, Alexander Korotkov
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/.