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https://issues.apache.org/jira/browse/FLINK-8255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16466383#comment-16466383
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ASF GitHub Bot commented on FLINK-8255:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/5961#discussion_r186527205
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/util/typeutils/FieldAccessor.java
---
@@ -157,15 +156,15 @@ public T set(T record, F fieldValue) {
SimpleTupleFieldAccessor(int pos, TypeInformation<T> typeInfo) {
--- End diff --
accessing fields in a `Row` will fail because `Row` does not extend
`Tuple`. For a proper fix, we would need a `RowFieldAccessor` and use that one
when we deal with a `DataStream<Row>`. We would then need to add the
`RowFieldAccessor` to the `FieldAccessorFactory`.
> 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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