Abstract: Methods and apparatus, including computer program products, related to query language function in-lining. In general, data characterizing a query in accordance with structured query language format is received. A determination is made as to whether the query includes qualified function calls. If the query includes the qualified function calls, operations are performed that include: mapping available values from the qualified function calls to available parameters of the qualified functions referred to by the qualified function calls; replacing the qualified function calls with data derived from a body of code to be executed when a corresponding function is called, where the replacing is to generate a modified query and the data derived from the body of code is based on the mapping; and providing the modified query to be executed as a substitute for an original version of the query.