199012a3d8
0452b461bc made get_eclass_for_sort_expr() always set EquivalenceClass.ec_sortref if it's not done yet. This leads to an asymmetric situation when whoever first looks for the EquivalenceClass sets the ec_sortref. It is also counterintuitive that get_eclass_for_sort_expr() performs modification of data structures. This commit makes make_pathkeys_for_sortclauses_extended() responsible for setting EquivalenceClass.ec_sortref. Now we set the EquivalenceClass.ec_sortref's needed to explore alternative GROUP BY ordering specifically during building pathkeys by the list of grouping clauses. Discussion: https://postgr.es/m/17037754-f187-4138-8285-0e2bfebd0dea%40postgrespro.ru Reported-by: Tom Lane Author: Andrei Lepikhov Reviewed-by: Alexander Korotkov, Pavel Borisov
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/.