question: private static void explicitOverlapTest ( final ISchemaVersion schemaVersion ) throws IOException { final Writer output = openOutput ( schemaVersion , "explicit_explicit" , TestType . UNION ) ; final Random random = new Random ( randomLong ( ) ) ; final HLL hll = newHLL ( HLLType . EMPTY ) ; final HLL emptyHLL = newHLL ( HLLType . EMPTY ) ; cumulativeUnionLine ( output , hll , emptyHLL , schemaVersion ) ; for ( int i = 0 ; i < EXPLICIT_THRESHOLD ; i ++ ) { final HLL explicitHLL = newHLL ( HLLType . EXPLICIT ) ; explicitHLL . addRaw ( random . nextLong ( ) ) ; cumulativeUnionLine ( output , hll , explicitHLL , schemaVersion ) ; cumulativeUnionLine ( output , hll , explicitHLL , schemaVersion ) ; } output . flush ( ) ; output . close ( ) ; }
target:  Unions an EMPTY accumulator with EXPLICIT HLLs, each having a single random value, twice in a row to verify that the set properties are satisfied. Format: cumulative union Tests: - EMPTY U EXPLICIT - EXPLICIT U EXPLICIT