code: public static <IN> CassandraSinkBuilder<IN> addSink(org.apache.flink.streaming.api.scala.DataStream<IN> input) {
  		return addSink(input.javaStream());
  	}
docs: Writes a DataStream into a Cassandra database.
  
  @param input input DataStream
  @param <IN>  input type
  @return CassandraSinkBuilder, to further configure the sink