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SubPlan nodes are typically built very early, before any RelOptInfos have been constructed for the parent query level. As a result, the simple_rel_array in the parent root has not yet been initialized. Currently, during cost estimation of a SubPlan's testexpr, we may call examine_variable() to look up statistical data about the expressions. This can lead to "no relation entry for relid" errors. To fix, pass root as NULL to cost_qual_eval() in cost_subplan(), since the root does not yet contain enough information to safely consult statistics. One exception is SubPlan nodes built for the initplans of MIN/MAX aggregates from indexes. In this case, having a NULL root is safe because testexpr will be NULL. Additionally, an initplan will by definition not consult anything from the parent plan. Backpatch to all supported branches. Although the reported call path that triggers this error is not reachable prior to v17, there's no guarantee that other code paths -- especially in extensions -- could not encounter the same issue when cost_qual_eval() is called with a root that lacks a valid simple_rel_array. The test case is not included in pre-v17 branches though. Bug: #19037 Reported-by: Alexander Lakhin <exclusion@gmail.com> Diagnosed-by: Tom Lane <tgl@sss.pgh.pa.us> Author: Richard Guo <guofenglinux@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/19037-3d1c7bb553c7ce84@postgresql.org Backpatch-through: 13
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/.