Clojure functions and data structures for working with datasets that exceed available RAM.

The core primitives include:

• External sorting - sorts an arbitrarily large collection in constant space, and returns a lazy seq of the results. Intermediate results are transparently spilled to disk (items serialized via Fressian).

• ExternalSet is a datatype representing a file-backed set data structure, implementing clojure.lang.IPersistentSet. Values are transparently serialized via Fressian and stored in a Riffle.

• Operations are provided for set intersection, union, shuffling, and more.

See the docs for the full API.