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https://issues.apache.org/jira/browse/FLINK-4624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15517351#comment-15517351
 ] 

ASF GitHub Bot commented on FLINK-4624:
---------------------------------------

Github user greghogan commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2527#discussion_r80309626
  
    --- Diff: 
flink-libraries/flink-gelly-examples/src/test/java/org/apache/flink/graph/library/SummarizationITCase.java
 ---
    @@ -100,23 +102,41 @@ public void testWithVertexAndAbsentEdgeValues() 
throws Exception {
                validateEdges(SummarizationData.EXPECTED_EDGES_ABSENT_VALUES, 
summarizedEdges);
        }
     
    -   private void validateVertices(String[] expectedVertices,
    -                                                                           
                                                List<Vertex<Long, 
Summarization.VertexValue<String>>> actualVertices) {
    +   @Test
    +   public void testWithVertexAndEdgeLongValues() throws Exception {
    +           ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
    +
    +           Graph<Long, Long, Long> input = Graph.fromDataSet(
    +                           SummarizationData.getVertices(env),
    +                           SummarizationData.getEdges(env),
    +                           env)
    +                   .run(new TranslateVertexValues<Long, String, Long, 
String>(new StringToLong()))
    +                   .run(new TranslateEdgeValues<Long, Long, String, 
Long>(new StringToLong()));
    +
    +           List<Vertex<Long, Summarization.VertexValue<Long>>> 
summarizedVertices = Lists.newArrayList();
    --- End diff --
    
    Can replace Guava's `Lists.newArrayList()` with `new ArrayList<>()`.


> 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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