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We previously allowed this, but it leads to odd behaviors, basically because putting a SRF there is inconsistent with the principle that a window function doesn't change the number of rows in the query result. There doesn't seem to be a strong reason to try to make such cases behave consistently. Users should put their SRFs in lateral FROM clauses instead. This issue has been sitting on the back burner for multiple years now, partially because it didn't seem wise to back-patch such a change. Let's squeeze it into v19 before it's too late. Bug: #17502 Bug: #19535 Reported-by: Daniel Farkaš <daniel.farkas@datoris.com> Reported-by: Qifan Liu <imchifan@163.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: David Rowley <dgrowleyml@gmail.com> Discussion: https://postgr.es/m/17502-281a7aaacfaa872a@postgresql.org Discussion: https://postgr.es/m/19535-376081d7cc07c86d@postgresql.org Backpatch-through: 19
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/19/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/19/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/.