KeyBy fields do not support java.lang.Array?

[Xu Pingyong]

Hi Aljoscha：
   
       The java.lang.Array hashCode depends on the reference instead of the 
content. If the keyBy field contains an array, Two records are hash-partitioned 
to different stream although their keys are equal.
      
                 int a1[] = new int[]{1, 2};  //  hashcode is : 5592464
int a2[] = new int[]{1, 2};  //  hashcode is 1830712962


        streaming job example:


Tuple2<byte[], Integer>[] soures = new Tuple2[]{new Tuple2("a".getBytes(), 2), 
new Tuple2("a".getBytes(), 5)};


final StreamExecutionEnvironment env = 
StreamExecutionEnvironment.getExecutionEnvironment();
env.fromElements(soures)
.keyBy(0)
.sum(1)
.map(new MapFunction<Tuple2<byte[], Integer>, Tuple2<String, Integer>>() {
@Override
public Tuple2<String, Integer> map(Tuple2<byte[], Integer> value) throws 
Exception {
return new Tuple2<>(new String(value.f0), value.f1);
}
}).print();


env.execute();


      Expected result is: (a, 7), not the actual result. What do you think 
about this case?


Best Regards!
Xu Pingyong