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The implementation uses smaller code when the "expected" operand is a small constant, but the implementation needlessly defined the set of acceptable constants more narrowly than the ABI does. Core PostgreSQL and PGXN don't use the constant path at all, so this is future-proofing. Back-patch to v13, where commit 30ee5d17c20dbb282a9952b3048d6ad52d56c371 introduced this code. Reviewed by Tom Lane. Reported by Christoph Berg. Discussion: https://postgr.es/m/20201009092825.GD889580@msg.df7cb.de
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/.