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geo_ops.c contains half a dozen functions that are just stubs throwing ERRCODE_FEATURE_NOT_SUPPORTED. Since it's been like that for more than twenty years, there's clearly not a lot of interest in filling in the stubs. However, I'm uncomfortable with deleting poly_distance(), since every other geometric type supports a distance-to-another-object- of-the-same-type function. We can easily add this capability by cribbing from poly_overlap() and path_distance(). It's possible that the (existing) test case for this will show some numeric instability, but hopefully the buildfarm will expose it if so. In passing, improve the documentation to try to explain why polygons are distinct from closed paths in the first place. Discussion: https://postgr.es/m/3426566.1638832718@sss.pgh.pa.us
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/.