I am currently working on Library with some specific operators to manipulate RangeType in PostGreSQL. I would like to know if it is possible to return a setof rangetype elements in Postresql in C-Language function using the suggestion like specified here: https://www.postgresql.org/docs/current/xfunc-c.html#XFUNC-C-RETURN-SET. I have been trying this for days. If what I am trying to do is impossible, is there any way I can use to have a RangeType set return?