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https://issues.apache.org/jira/browse/FLINK-8255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16477104#comment-16477104
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ASF GitHub Bot commented on FLINK-8255:
---------------------------------------

Github user fhueske commented on the issue:

    https://github.com/apache/flink/pull/5961
  
    Thanks for the update @snuyanzin. I'll try to have a look at the changes in 
the next days.
    Best, Fabian


> Key expressions on named row types do not work
> ----------------------------------------------
>
>                 Key: FLINK-8255
>                 URL: https://issues.apache.org/jira/browse/FLINK-8255
>             Project: Flink
>          Issue Type: Bug
>          Components: DataSet API, DataStream API
>    Affects Versions: 1.4.0, 1.5.0
>            Reporter: Timo Walther
>            Assignee: Sergey Nuyanzin
>            Priority: Major
>
> The following program fails with a {{ClassCastException}}. It seems that key 
> expressions and rows are not tested well. We should add more tests for them.
> {code}
> final StreamExecutionEnvironment env = 
> StreamExecutionEnvironment.getExecutionEnvironment();
> TypeInformation[] types = new TypeInformation[] {Types.INT, Types.INT};
> String[] fieldNames = new String[]{"id", "value"};
> RowTypeInfo rowTypeInfo = new RowTypeInfo(types, fieldNames);
> env.fromCollection(Collections.singleton(new Row(2)), rowTypeInfo)
> .keyBy("id").sum("value").print();
> env.execute("Streaming WordCount");
> {code}



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