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https://issues.apache.org/jira/browse/FLINK-4624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15509376#comment-15509376
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Timo Walther commented on FLINK-4624:
-------------------------------------
{{VertexGroupItem<K, VV>}} and {{VertexGroupItem}} are compatible. They both
have the same class. Just the generics cause problems as Java classes have no
generics (because of legacy reasons). Just do a hard cast. If you look into the
type extractor, you will see that we had to do this several times.
{code}
@SuppressWarnings({"rawtype", "unchecked"})
TypeInformation<VertexGroupItem<K, VV>> t = (TypeInformation<VertexGroupItem<K,
VV>>) new TupleTypeInfo(VertexGroupItem.class, keyType, keyType, eitherType,
BasicTypeInfo.LONG_TYPE_INFO);
{code}
> 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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