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ExecInitModifyTable() evaluated ForPortionOfExpr.targetRange unconditionally at executor start-up, with no EXEC_FLAG_EXPLAIN_ONLY guard. This caused three problems: - EXPLAIN (GENERIC_PLAN) failed with "no value found for parameter 1". - Plain EXPLAIN with FOR PORTION OF (null) raised "FOR PORTION OF target must not be null". - Plain EXPLAIN ran user functions appearing in the target a second time, beyond the one evaluation the planner already does for selectivity estimation. Now we skip the evaluation and the accompanying null check in explain-only mode. Reported-by: Noah Misch <noah@leadboat.com> Author: Paul A. Jungwirth <pj@illuminatedcomputing.com> Discussion: https://www.postgresql.org/message-id/flat/CA%2BrenyXci9khYXJ8uSwzF30DVw%2Bzc4QwGb1RdsuOu_YtrFuy1g%40mail.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/.