Atlas Stack Language is designed to be a stable method of representing complex data queries in a URL-friendly format. It is loosely based on the RPN expressions supported by Tobias Oetiker's rrdtool. The following is an example of a stack language expression:
In Bigtable, google present a language called Sawzall which is client supplied but can be run on the address space of servers https://static.googleusercontent.com/media/research.google.com/en//archive/sawzall-sciprog.pdf