Martin Junghanns commented on FLINK-4624:

Thanks for the explanation. As I need {{TypeInformation<VertexGroupItem<K, 
VV>}} could you please point me to an example where type informations for 
generic classes are created? I am only familiar with generic tuple types as 
those are also used throughout Gelly and Gradoop. 
I thought about using {{TypeExtractor.getForObject(..)}} but then I need to 
create instances of the generic types, which do not necessarily have no-arg 

> Gelly's summarization algorithm cannot deal with null vertex group values
> -------------------------------------------------------------------------
>                 Key: FLINK-4624
>                 URL: https://issues.apache.org/jira/browse/FLINK-4624
>             Project: Flink
>          Issue Type: Bug
>          Components: Gelly
>            Reporter: Till Rohrmann
>            Assignee: Martin Junghanns
>             Fix For: 1.2.0
> Gelly's {{Summarization}} algorithm cannot handle null values in the 
> `VertexGroupItem.f2`. This behaviour is hidden by using Strings as a vertex 
> value in the {{SummarizationITCase}}, because the {{StringSerializer}} can 
> handle null values. 

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