Github user vasia commented on the pull request:
https://github.com/apache/flink/pull/400#issuecomment-74527767
Right, so let me copy:
The problem is here:
```
DataSet<Tuple2<K, HashSet<K>>> neighborhoods = input.reduceOnEdges(new
NeighborhoodEdgesFunction<K>(), EdgeDirection.OUT);
```
and we try to get the return type `Tuple2<K, HashSet<K>>` like this:
```
public TypeInformation<T> getProducedType() {
return TypeExtractor.createTypeInfo(EdgesFunction.class,
function.getClass(), 2, null, null);
}
```
Anyone have an idea? Is it because of the nested type parameter in
`Tuple2<K, HashSet<K>>` ?
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