dt_aggregate_keycmp
if ((rval = dt_aggregate_keycmp(&lh[i], &rh[i])) != 0)
return (dt_aggregate_keycmp(&lh[i], &rh[i]));
dt_aggregate_keycmp(&sorted[i], &sorted[i - 1]) == 0)
return (dt_aggregate_keycmp(lhs, rhs));
if ((rval = dt_aggregate_keycmp(lhs, rhs)) != 0)
return (dt_aggregate_keycmp(lhs, rhs));