Hector's column slice iterator

hector_column_slice_npe.java

SliceQuery<Integer, Double Long> query = HFactory.createSliceQuery(keyspace, IntegerSerializer.get(),
    LongSerializer.get(), DoubleSerializer.get());
query.setColumnFamily(rawMetricsDataCF);
query.setKey(scheduleId);

ColumnSliceIterator<Integer, Double, Long> iterator = new ColumnSliceIterator<Integer, Double, Long>(
    query, startTime.getMillis(), endTime.getMillis(), false);
HColumn<Long, Double> column = iterator.next();