Depends on sketches-core.
To use Hive UDFs, you should do the following:
hive> add jar sketches-hive-0.1.0-incDeps.jar
hive> create temporary function estimate as 'com.yahoo.sketches.hive.theta.EstimateSketchUDF';
hive> create temporary function dataToSketch as 'com.yahoo.sketches.hive.theta.DataToSketchUDAF';
hive> select estimate(dataToSketch(myCol, 16384, 1.0)) from myTable where color = blue;