pub unsafe fn function_selectivity(
arg_root: *mut PlannerInfo,
arg_funcid: Oid,
arg_args: *mut List,
arg_inputcollid: Oid,
arg_is_join: bool,
arg_varRelid: c_int,
arg_jointype: Type,
arg_sjinfo: *mut SpecialJoinInfo,
) -> Selectivity