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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.
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/.