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The function generated to perform JIT compiled tuple deforming failed when HeapTupleHeader's t_hoff was bigger than a signed int8. I'd failed to realize that LLVM's getelementptr would treat an int8 index argument as signed, rather than unsigned. That means that a hoff larger than 127 would result in a negative offset being applied. Fix that by widening the index to 32bit. Add a testcase with a wide table. Don't drop it, as it seems useful to verify other tools deal properly with wide tables. Thanks to Justin Pryzby for both reporting a bug and then reducing it to a reproducible testcase! Reported-By: Justin Pryzby Author: Andres Freund Discussion: https://postgr.es/m/20181115223959.GB10913@telsasoft.com Backpatch: 11, just as jit compilation was
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/.