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In the previous design, the GetForeignUpperPaths FDW callback hook was called before we got around to labeling upper relations with the proper consider_parallel flag; this meant that any upper paths created by an FDW would be marked not-parallel-safe. While that's probably just as well right now, we aren't going to want it to be true forever. Hence, abandon the idea that FDWs should be allowed to inject upper paths before the core code has gotten around to creating the relevant upper relation. (Well, actually they still can, but it's on their own heads how well it works.) Instead, adopt the same API already designed for create_upper_paths_hook: we call GetForeignUpperPaths after each upperrel has been created and populated with the paths the core planner knows how to make. |
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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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.