| Name | Description | Type | Package | Framework |
| UniqueColumns | A simple map reduce job that computes the unique column families and column qualifiers in a table. | Class | org.apache.accumulo.examples.simple.mapreduce | Apache Accumulo |
| UniqueColumns .UMapper | Class | org.apache.accumulo.examples.simple.mapreduce.UniqueColumns | Apache Accumulo | |
| UniqueColumns .UReducer | Class | org.apache.accumulo.examples.simple.mapreduce.UniqueColumns | Apache Accumulo | |