Function compare_join_arrays 

pub fn compare_join_arrays(
    left_arrays: &[Arc<dyn Array>],
    left: usize,
    right_arrays: &[Arc<dyn Array>],
    right: usize,
    sort_options: &[SortOptions],
    null_equality: NullEquality,
) -> Result<Ordering, DataFusionError>

Get comparison result of two rows of join arrays