Till Rohrmann created FLINK-4624:
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Summary: 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
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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