Where to write the transformation logic in native Hana ?

Hi Experts,

One of the Revenue report is running in BW and client is expecting the same report to be developed in native Hana (Hana Studio). I am aware of the fact that by using Calculation view,i  can pull all the required fields from multiple tables.

But here my question is how & where i can write the transformation logic for the data which i am getting from source table.

Say one record is being split into multiple records on the basis of Date open & Date closed and this is being achieved in BW at transformation level using ABAP Code in End Routine.

How can we manage the same in Native Hana?

Thanks,

Vikas Gupta