With the rise of cloud-computing and cloud-scale data management the importance of shipping the code of an application to its data has increased tremendously. Especially when offering data analytics on top of traditional relational databases as a service in the cloud, new data-centric programming paradigms become necessary. Traditionally, relational databases offer two approaches to ship code close to the data: declarative SQL statements and imperative stored procedures. While SQL statements can be efficiently optimized and parallelized, stored procedures allow more complex logic that can be efficiently decomposed.