ABAP Databases, oracle, MaxDB et al., are mostly RDBMS. Right now, I have a JSON structure that cannot be normalised and hence I want to store it as is. So, I want a MongoDB like Object store in ABAP.
What's the best way to achieve this? Is data cluster an option? Perhaps the only option?
I don't think you can connect to some other then supported DBs directly from ABAP. If you have Netweaver Java, you can call some custom Java application, which accesses MongoDB. You can check SAP Hana if there is something similar.
In ABAP you interact with RDBMS via ABAP Dictionary.
It supports data types like LCHR, STRING, RAWSTRING. Checkout docs for more details.