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Base de données relationnelle
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When adjust_appendrel_attrs translates a Var referencing a parent relation into a Var referencing a child relation, it propagates varnullingrels from the parent Var to the translated Var. Previously, the code simply overwrote the translated Var's varnullingrels with those of the parent. This was incorrect because the translated Var might already possess nonempty varnullingrels. This happens, for example, when a LATERAL subquery within a UNION ALL references a Var from the nullable side of an outer join. In such cases, the translated Var correctly carries the outer join's relid in its varnullingrels. Overwriting these bits with the parent Var's set caused the planner to lose track of the fact that the Var could be nulled by that outer join. In the reported case, because the underlying column had a NOT NULL constraint, the planner incorrectly deduced that the Var could never be NULL and discarded essential IS NOT NULL filters. This led to incorrect query results where NULL rows were returned instead of being filtered out. To fix, use bms_add_members to merge the parent Var's varnullingrels into the translated Var's existing set, preserving both sources of nullability. Back-patch to v16. Although the reported case does not seem to cause problems in v16, leaving incorrect varnullingrels in the tree seems like a trap for the unwary. Bug: #19412 Reported-by: Sergey Shinderuk <s.shinderuk@postgrespro.ru> Author: Richard Guo <guofenglinux@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/19412-1d0318089b86859e@postgresql.org Backpatch-through: 16 |
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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. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.