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https://issues.apache.org/jira/browse/FLINK-4624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15506100#comment-15506100
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Martin Junghanns commented on FLINK-4624:
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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
constructors.
> 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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