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This allows both univariate and multivariate statistics to be built on virtual generated columns and expressions that refer to virtual generated columns. The restriction disallowing extended statistics on a single column is lifted in the case of a single virtual generated column, since it is treated as a single expression. In the catalogs, references to virtual generated columns are stored as-is. They are expanded at ANALYZE time to build the statistics, and at planning time to allow the optimizer to make use of the statistics. This allows the statistics to be correctly rebuilt using ANALYZE, if a column's generation expression is altered (which causes any existing statistics data to be deleted). Author: Yugo Nagata <nagata@sraoss.co.jp> Reviewed-by: Dean Rasheed <dean.a.rasheed@gmail.com> Discussion: https://postgr.es/m/20250422181006.dd6f9d1d81299f5b2ad55e1a@sraoss.co.jp |
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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/.