904f6a593a
There are several pieces of catalog information that need to be retrieved for a relation during the early stage of planning. These include relhassubclass, which is used to clear the inh flag if the relation has no children, as well as a column's attgenerated and default value, which are needed to expand virtual generated columns. More such information may be required in the future. Currently, these pieces of catalog data are collected in multiple places, resulting in repeated table_open/table_close calls for each relation in the rangetable. This patch centralizes the collection of all required early-stage catalog information into a single loop over the rangetable, allowing each relation to be opened and closed only once. 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/.