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The point of this restriction is to avoid trying to substitute variables into timestamp literal values, which may contain strings like '12:34'. There is a good deal more that should be done to reduce pgbench's tendency to substitute where it shouldn't. But this is sufficient to solve the case complained of by Jaime Soler, and it's simple enough to back-patch. Back-patch to v11; before commit 9d36a3866, pgbench had a slightly different definition of what a variable name is, and anyway it seems unwise to change long-stable branches for this. Fabien Coelho Discussion: https://postgr.es/m/alpine.DEB.2.22.394.2006291740420.805678@pseudo
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/.