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Since commit7012b132d0, postgres_fdw has been able to push down the toplevel aggregation operation to the remote server. Commite2f1eb0ee3made it possible to break down the toplevel aggregation into one aggregate per partition. This commit lets postgres_fdw push down aggregation in that case just as it does at the top level. In order to make this work, this commit adds an additional argument to the GetForeignUpperPaths FDW API. A matching argument is added to the signature for create_upper_paths_hook. Third-party code using either of these will need to be updated. Also adjust create_foreignscan_plan() so that it picks up the correct set of relids in this case. Jeevan Chalke, reviewed by Ashutosh Bapat and by me and with some adjustments by me. The larger patch series of which this patch is a part was also reviewed and tested by Antonin Houska, Rajkumar Raghuwanshi, David Rowley, Dilip Kumar, Konstantin Knizhnik, Pascal Legrand, and Rafia Sabih. Discussion: http://postgr.es/m/CAM2+6=V64_xhstVHie0Rz=KPEQnLJMZt_e314P0jaT_oJ9MR8A@mail.gmail.com Discussion: http://postgr.es/m/CAM2+6=XPWujjmj5zUaBTGDoB38CemwcPmjkRy0qOcsQj_V+2sQ@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/.