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The initial commit tried to test them on trivial cases such as 0, reasoning that we shouldn't hit any portability issues that way. The buildfarm immediately proved that hope ill-founded, and anyway it's not a great testing scheme because it doesn't prove that we're even calling the right library function for each SQL function. Instead, let's test them at inputs such as 1 (or something within the valid range, as needed), so that each function should produce a different output. As committed, this is just about certain to show portability failures, because it's very unlikely that every platform computes these functions the same as mine down to the last bit. However, I want to put it through a buildfarm cycle this way, so that we can see how big the variations are. The plan is to add "set extra_float_digits = -1", or whatever we need in order to hide the variations; but first we need data. Discussion: https://postgr.es/m/E1h3nUY-0000sM-Vf@gemulon.postgresql.org
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/.