Anton Voloshin <a.volos...@postgrespro.ru> writes: > The documentation for 13 and 14 says in "Geometric Functions and > Operators" https://www.postgresql.org/docs/14/functions-geometry.html: >>> @@ geometric_type → point >>> Computes the center point. Available for box, lseg, path, polygon, circle. >>> @@ box '(2,2),(0,0)' → (1,1)
> However, apparently, this operator does not work for path: >>> postgres=# SELECT @@ path '[(0,0),(0,1)]'; >>> ERROR: function "path_center" not implemented The fact that this operator is documented is probably my fault --- when I went through the operator tables not long ago, I made sure there was an entry for every operator listed in the system catalogs. It didn't enter my mind that some of them might be pointing at useless stubs :-(. Looking through geo_ops.c, I see that not only path_center but also dist_lb, dist_bl, close_sl, close_lb, poly_distance error out with "not implemented". Given that that code has sat there for more than 20 years with nobody coming to finish the job, I think we should just rip those functions and catalog entries out altogether. It's misleading and probably a small waste of cycles to have useless entries in pg_proc and pg_operator. regards, tom lane