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When JIT deformed tuples (controlled via the jit_tuple_deforming GUC), types narrower than sizeof(Datum) would be zero-extended up to Datum width. This wasn't the same as what fetch_att() does in the standard tuple deforming code. Logically the values are the same when fetching via the DatumGet*() marcos, but negative numbers are not the same in binary form. In the report, the problem was manifesting itself with: ERROR: could not find memoization table entry in a query which had a "Cache Mode: binary" Memoize node. However, it's currently unclear what else is affected. Anything that uses datum_image_eq() or datum_image_hash() on a Datum from a tuple deformed by JIT could be affected, but it may not be limited to that. The fix for this is simple: use signed extension instead of zero extension. Many thanks to Emmanuel Touzery for reporting this issue and providing steps and backup which allowed the problem to easily be recreated. Reported-by: Emmanuel Touzery <emmanuel.touzery@plandela.si> Author: David Rowley <dgrowleyml@gmail.com> Discussion: https://postgr.es/m/DB8P194MB08532256D5BAF894F241C06393F3A@DB8P194MB0853.EURP194.PROD.OUTLOOK.COM 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. 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/.