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Commit 1efc7e538 did a poor job of emulating existing logic for touching Datums that might be expanded-object pointers. It didn't check for typlen being -1 first, which meant it could crash on fixed-length pass-by-ref values, and probably on cstring values as well. It also didn't use DatumGetPointer before VARATT_IS_EXTERNAL_EXPANDED, which while currently harmless is not according to documentation nor prevailing style. I also think the lack of any explanation as to why datumSerialize makes these particular nonobvious choices is pretty awful, so fix that. Per report from Jarred Ward. Back-patch to 9.6 where this code came in. Discussion: https://postgr.es/m/6F61E6D2-2F5E-4794-9479-A429BE1CEA4B@simple.com
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/.