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Commit db0d67db2 tweaked sort costing, which however resulted in a couple plan changes in our regression tests. Most of the new plans were fine, but partition_aggregate were meant to test parallel plans and the new plans were serial. Fix that by lowering parallel_setup_cost to 0, which is enough to switch to the parallel plan again. Commit 1349d2790 already made the plans parallel again, but do this anyway to keep the tests in sync with 15, to make backpatching simpler. Report and patch by David Rowley. Author: David Rowley Reviewed-by: Tomas Vondra Discussion: https://postgr.es/m/CAApHDvpVFgWzXdtUQkjyOPhNrNvumRi_=ftgS79KeAZ92tnHKQ@mail.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. 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/.