Methods, systems, and apparatus, including computer programs encoded on computer storage media, for a source independent query language. One of the methods includes receiving a first executable statement, the first executable statement referencing a second set of fields in a dataset, the first executable statement having instructions to cause the query processor to perform operations on data in the dataset. The method includes Generating a second executable statement based on the first set of fields and the first executable statement. The method includes determining a mapping between the first set of fields and the second set of fields. The method includes specifying a derived dataset using the corresponding values and the mapping. The method includes generating instructions to cause the query processor to perform the operations on the derived dataset. The method includes sending the second executable statement to the query processor.