question: private static void globalUnionTest ( final ISchemaVersion schemaVersion ) throws IOException { final Writer output = openOutput ( schemaVersion , "comprehensive" , TestType . UNION ) ; final HLL hll = newHLL ( HLLType . EMPTY ) ; final HLL emptyHLL = newHLL ( HLLType . EMPTY ) ; cumulativeUnionLine ( output , hll , emptyHLL , schemaVersion ) ; for ( int i = 0 ; i < 1000 ; i ++ ) { final HLL randomHLL = generateRandomHLL ( ) ; cumulativeUnionLine ( output , hll , randomHLL , schemaVersion ) ; } output . flush ( ) ; output . close ( ) ; }
target:  Unions an EMPTY accumulator with random HLLs. Format: cumulative union Tests: - hopefully all union possibilities