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build_grouped_rel() makes a flat copy of the input relation, including its FDW fields. As a result, when building a grouped join relation for eager aggregation, add_paths_to_joinrel() called the FDW's GetForeignJoinPaths for it. postgres_fdw then failed with "Aggref found where not expected" on the partial Aggrefs in the target list, and in any case it would have treated a partially aggregated input as a plain foreign scan. FDWs are not prepared to handle grouped relations, so clear serverid, fdwroutine and fdw_private in build_grouped_rel(). Reported-by: Robert Haas <robertmhaas@gmail.com> Author: Richard Guo <guofenglinux@gmail.com> Discussion: https://postgr.es/m/CA+Tgmob7iSM9YkRM44VjUDuaCchW-fY54MV5njpTZTL9uNyV4w@mail.gmail.com Backpatch-through: 19
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/.