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https://issues.apache.org/jira/browse/FLINK-4624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15517294#comment-15517294
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ASF GitHub Bot commented on FLINK-4624:
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Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/2527
`ToNullValue` is now committed in a new `translator` package in Gelly. I
think that one will be generally very useful.
I created FLINK-4673 so we can look at fixing the type extraction with the
Either type. Using the recently added `TypeInfoFactory` it was quite simple and
I will create the PR after tests pass (I also removed the explicit code from
`TypeExtractor`).
> 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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