Github user manuzhang commented on a diff in the pull request:
    --- Diff: 
    @@ -15,17 +15,18 @@
      * See the License for the specific language governing permissions and
      * limitations under the License.
    +package org.apache.gearpump.streaming.dsl.javaapi.functions
    -package org.apache.gearpump.streaming.javaapi.dsl.functions;
    - * GroupBy function which assign value of type T to groups
    + * Transforms one input into zero or more outputs of possibly different 
    + * This Java version of FlatMapFunction returns a java.util.Iterator.
    - * @param <T> Input value type
    - * @param <Group> Group Type
    + * @param T Input value type
    + * @param R Output value type
    -public interface GroupByFunction<T, Group> extends Serializable {
    -  Group apply(T t);
    +abstract class FlatMapFunction[T, R] extends SerializableFunction {
    --- End diff --
    it's already under the `javaapi` package. 

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