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https://issues.apache.org/jira/browse/FLINK-1133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14154896#comment-14154896
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ASF GitHub Bot commented on FLINK-1133:
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Github user twalthr commented on the pull request:
https://github.com/apache/incubator-flink/pull/137#issuecomment-57478197
Too quick. I think I could also do it recursively. A commit will follow..
> Type extractor cannot determine type of function
> ------------------------------------------------
>
> Key: FLINK-1133
> URL: https://issues.apache.org/jira/browse/FLINK-1133
> Project: Flink
> Issue Type: Bug
> Components: Java API
> Affects Versions: 0.7-incubating
> Reporter: Stephan Ewen
> Assignee: Timo Walther
> Fix For: 0.7-incubating
>
>
> This function fails in the type extractor.
> {code}
> public static final class DuplicateValue<T> implements MapFunction<Tuple1<T>,
> Tuple2<T, T>> {
>
> @Override
> public Tuple2<T, T> map(Tuple1<T> vertex) {
> return new Tuple2<T, T>(vertex.f0, vertex.f0);
> }
> }
> {code}
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