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https://issues.apache.org/jira/browse/FLINK-4624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15506211#comment-15506211
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Timo Walther commented on FLINK-4624:
-------------------------------------
You can get rid of the {{ClassCastException}} by using the correct constructor
call of {{TupleTypeInfo}}. There are two constructors one that creates plain
tuples and one that allows subclasses of tuples. In your case
{{VertexGroupItem}}.
{code}
new TupleTypeInfo<>(VertexGroupItem.class, keyType, keyType, eitherType,
BasicTypeInfo.LONG_TYPE_INFO)
{code}
should work.
> 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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