I have been working in various product areas within SAP SE for many years, hence have a deep understanding of the products listed below. Not only have I used them, I was part of the team developing them!
As part of the Hana development team I do know the details of the database quite well.
There are many options to combine Big Data with SAP including cheap ones.
Pick and use the the best suited SAP product for data Integration.
SAP Hana Smart Data Integration is one of the hidden gems, useful for many situations.
SAP Data Services is a very powerful ETL tool, per Gartner Magic Quadrant. We can help to be most efficient.