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"FPeq(infinity, infinity)" returned false, on account of getting NaN when it subtracts the two inputs. Fix that by adding a separate check for exact equality. FPle() and FPge() similarly got the wrong answer for two like-signed infinities. In those cases, we can just rearrange the comparisons to avoid potentially subtracting infinities. While the sibling functions FPne() etc accidentally gave the right answers even with the internal NaN results, it seems best to make similar adjustments to them to avoid depending on this. FPeq() has to be converted to an inline function to avoid double evaluations of its arguments, and I did the same for the others just for consistency. In passing, make the handling of NaN cases in line_eq() and point_eq_point() simpler and easier to reason about, and perhaps faster. This results in just one visible regression test change: slope() now gives DBL_MAX for two inputs of (inf,1e300), which is consistent with what it does for (1e300,inf), so that seems like a bug fix. Discussion: https://postgr.es/m/CAGf+fX70rWFOk5cd00uMfa__0yP+vtQg5ck7c2Onb-Yczp0URA@mail.gmail.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/.