From the website:
Cascalog is a tool for processing data on Hadoop with Clojure in a concise and expressive manner. Cascalog combines two cutting edge technologies in Clojure and Hadoop and resurrects an old one in Datalog. Cascalog is high performance, flexible, and robust.
Most query languages, like SQL, Pig, and Hive, are custom languages — and this leads to huge amounts of accidental complexity. Constructing queries dynamically by doing string manipulation is an impedance mismatch and makes usual programming techniques like abstraction and composition difficult.
Cascalog queries are first-class within Clojure and are extremely composable. Additionally, the Datalog syntax of Cascalog is simpler and more expressive than SQL-based languages.
Follow the getting started steps, check out the tutorial, and you’ll be running Cascalog queries on your local computer within 5 minutes.
Seems like I have heard the term datalog in TMQL discussions. 😉
I wonder what it would be like to define TMQL operators in Cascalog so that all the other capabilities of Cascalog are also available?
When the next draft appears that will be an interesting question to explore.