Add Insert on duplicate update batch in query builder

Hi,

I think all we need and using insert on duplicate update batch because it will reduce development time when doing add edit and delete functionality for unique records.

is that possible to add insert on duplicate update batch in codeigniter query builder. Currently we need to add this function in core system and when updating CI version then it is removed.

i also want to contribute something in CI. Can you guide me how can i do that.

Thanks