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From "Timo Walther (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4624) Gelly's summarization algorithm cannot deal with null vertex group values
Date Wed, 21 Sep 2016 09:35:20 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15509376#comment-15509376
] 

Timo Walther commented on FLINK-4624:
-------------------------------------

{{VertexGroupItem<K, VV>}} and {{VertexGroupItem}} are compatible. They both have the
same class. Just the generics cause problems as Java classes have no generics (because of
legacy reasons). Just do a hard cast. If you look into the type extractor, you will see that
we had to do this several times.

{code}
@SuppressWarnings({"rawtype", "unchecked"})
TypeInformation<VertexGroupItem<K, VV>> t = (TypeInformation<VertexGroupItem<K,
VV>>) new TupleTypeInfo(VertexGroupItem.class, keyType, keyType, eitherType, BasicTypeInfo.LONG_TYPE_INFO);
{code}

> 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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