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When the rewriter converts an RTE_RELATION RTE for a view into an RTE_SUBQUERY RTE containing the view's defining query, leave the relid field alone instead of zeroing it. This allows the planner to tell that the subquery came from a view rather than having been written in-line, which is needed to support an upcoming planner bug fix. We cannot change the behavior of the outfuncs/readfuncs code in released branches, so the relid field will not survive in plans passed to parallel workers; therefore this info should not be relied on in the executor. This back-patches a portion of the data structure definitional changes made in v16 and up by commit 47bb9db75. It's being committed separately for visibility in the commit log, but with luck it will not actually matter to anyone. While it's not inconceivable that this change will break code expecting relid to be zero in a subquery RTE, we can hope that such code has already been adjusted to cope with v16 and up. Reported-by: Duncan Sands <duncan.sands@deepbluecap.com> Diagnosed-by: Tender Wang <tndrwang@gmail.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Dean Rasheed <dean.a.rasheed@gmail.com> Discussion: https://postgr.es/m/3518c50a-ab18-482f-b916-a37263622501@deepbluecap.com Backpatch-through: 13-15
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/.