3d3a81fc24
6b94e7a6da adjusted generate_orderedappend_paths() to consider fractional paths. However, it didn't manage to interpret the tuple_fraction value correctly. According to the header comment of grouping_planner(), the tuple_fraction >= 1 specifies the absolute number of expected tuples. That number must be divided by the expected total number of tuples to get the actual fraction. Even though this is a bug fix, we don't backpatch it. The risks of the side effects of plan changes on stable branches are too high. Reported-by: Andrei Lepikhov <lepihov@gmail.com> Discussion: https://postgr.es/m/3ca271fa-ca5c-458c-8934-eb148622b270%40gmail.com Author: Andrei Lepikhov <lepihov@gmail.com> Reviewed-by: Junwang Zhao <zhjwpku@gmail.com> Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
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/.