Systems and apparatuses are provided for analytical data processing. A system includes a processor and a non-transitory computer readable medium, comprising machine readable instructions executable by the processor. The instructions include a query compiler to identify a call to a user defined function and an output expression defining an output field for the user defined function within a query and generate an output table object for the user defined function. The generated output table object contains the defined output field. The instructions further include a processing engine to execute the user defined function and populate the output field in rows into the output table object with the output of the user defined function.