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https://issues.apache.org/jira/browse/FLINK-4624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15515537#comment-15515537
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ASF GitHub Bot commented on FLINK-4624:
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Github user s1ck commented on the issue:
https://github.com/apache/flink/pull/2527
> I'm not following why specifying the TypeInformation is now required with
the change to using Either. Is the type system failing to handle this properly?
You are right, I was experimenting with return type definitions for the
groupReduce and the map call. However, for the map call in
`Summarization.java:126` the return type definition is required or the job
fails as it cannot determine the type for `VV`.
> 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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