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Make build_joinrel_tlist() responsible for adding PHVs that were already computed in one or the other input relation, and therefore change add_placeholders_to_joinrel() to only add PHVs that will be newly computed in this joinrel's output. This makes the handling of PHVs in build_joinrel_tlist() more like its handling of plain Vars, which seems like a good thing on intelligibility grounds and will simplify planned future changes. There is a purely cosmetic side-effect that the order of entries in the joinrel's tlist may change; but since it becomes more like the order of entries in the input tlists, that's not bad. The reason it wasn't done like this originally was the potential cost of looking up PlaceHolderInfo entries to consult ph_needed. Now that that's O(1) it shouldn't hurt. Discussion: https://postgr.es/m/1405792.1660677844@sss.pgh.pa.us
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/.