pub const BATCH_HEADER_SIZE: usize = size_of::<i32>() + size_of::<u8>() + size_of::<i32>() + size_of::<i16>() +
                        size_of::<i32>() + size_of::<i64>() + size_of::<i64>() +
            size_of::<i64>() + size_of::<i16>() + size_of::<i32>(); // 45usize