Function pgrx_pg_sys::function_selectivity

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: JoinType,
    arg_sjinfo: *mut SpecialJoinInfo
) -> Selectivity