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Currently, we expand virtual generated columns after we have pulled up any SubLinks within the query's quals. This ensures that the virtual generated column references within SubLinks that should be transformed into joins are correctly expanded. This approach works well and has posed no issues. In an upcoming patch, we plan to centralize the collection of catalog information needed early in the planner. This will help avoid repeated table_open/table_close calls for relations in the rangetable. Since this information is required during sublink pull-up, we are moving the expansion of virtual generated columns to occur beforehand. To achieve this, if any EXISTS SubLinks can be pulled up, their rangetables are processed just before pulling them up. Author: Richard Guo <guofenglinux@gmail.com> Reviewed-by: Robert Haas <robertmhaas@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAMbWs4-bFJ1At4btk5wqbezdu8PLtQ3zv-aiaY3ry9Ymm=jgFQ@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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.