Pilosa: An open source, distributed index

A Pilosa field might correspond to a single field in a relational table, where each row in a standard Pilosa field represents a single possible value of the relational field. Because Pilosa supports extremely high cardinality in both rows and columns, many types of joins are accomplished with basic Pilosa queries across multiple fields. For example, for a field with a time quantum of , the following queries will result in the data described in the diagram below:

Mutex fields are similar to fields, with the distinction of requiring the row value for each column to be mutually exclusive.

Source: www.pilosa.com