1. A method comprising: receiving, by a database server from a remote application server, a query associated with a calculation scenario that defines a data flow model that includes one or more calculation nodes, each calculation node defining one or more operations to execute on the database server; transforming at least one of the calculation nodes into a star schema; instantiating, by the database server, the calculation scenario with the transformed at least one calculation node; executing, by a calculation engine of the database server, the operations defined by the calculation nodes of the instantiated calculation scenario other than the transformed at least one calculation node and executing, by an OLAP engine, the transformed at least one calculation node to collectively result in a responsive data set; and providing, by the database server to the application server, the data set.