Function pgx_pg_sys::cost_merge_append

pub unsafe fn cost_merge_append(
    arg_path: *mut Path, 
    arg_root: *mut PlannerInfo, 
    arg_pathkeys: *mut List, 
    arg_n_streams: c_int, 
    arg_input_startup_cost: Cost, 
    arg_input_total_cost: Cost, 
    arg_tuples: f64
)