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The EvalPlanQual recheck for TID Range Scan wasn't rechecking the TID qual still passed after following update chains. This could result in tuples being updated or deleted by plans using TID Range Scans where the ctid of the new (updated) tuple no longer matches the clause of the scan. This isn't desired behavior, and isn't consistent with what would happen if the chosen plan had used an Index or Seq Scan, and that could lead to hard to predict behavior for scans that contain TID quals and other quals as the planner has freedom to choose TID Range or some other non-TID scan method for such queries, and the chosen plan could change at any moment. Here we fix this by properly implementing the recheck function for TID Range Scans. Backpatch to 14, where TID Range Scans were added Reported-by: Sophie Alpert <pg@sophiebits.com> Author: Sophie Alpert <pg@sophiebits.com> Author: David Rowley <dgrowleyml@gmail.com> Reviewed-by: David Rowley <dgrowleyml@gmail.com> Reviewed-by: Chao Li <li.evan.chao@gmail.com> Discussion: https://postgr.es/m/4a6268ff-3340-453a-9bf5-c98d51a6f729@app.fastmail.com Backpatch-through: 14 |
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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/.