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Use the clause's required_relids not clause_relids for testing whether it is computable at the current join level, if it is a clone clause generated by deconstruct_distribute_oj_quals(). Arguably, this is more correct and we should do it for all clauses; that would at least remove the handwavy claim that we are doing it to save cycles compared to inspecting Vars individually. However, attempting to do that exposes that we are not being careful to compute an accurate value for required_relids in all cases. I'm unsure whether it's a good idea to attempt to do that for v16, or leave it as future clean-up. In the meantime, this quick hack demonstrably fixes some cases, so let's squeeze it in for beta1. Patch by me, but great thanks to Richard Guo for investigation and testing. The new test cases are all modeled on his examples. Discussion: https://postgr.es/m/CAMbWs4-_vwkBij4XOQ5ukxUvLgwTm0kS5_DO9CicUeKbEfKjUw@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/.