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Renaming varchar_transform to varchar_support had a side effect I hadn't foreseen: the core regression tests leave around a transform object that relies on that function, so the name change breaks cross-version upgrade tests, because the name used in the older branches doesn't match. Since the dependency on varchar_transform was chosen with the aid of a dartboard anyway (it would surely not work as a language transform support function), fix by just choosing a different random builtin function with the right signature. Also add some comments explaining why this isn't horribly unsafe. I chose to make the same substitution in a couple of other copied-and-pasted test cases, for consistency, though those aren't directly contributing to the testing problem. Per buildfarm. Back-patch, else it doesn't fix the problem.
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/.