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https://issues.apache.org/jira/browse/FLINK-2442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14653882#comment-14653882
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ASF GitHub Bot commented on FLINK-2442:
---------------------------------------
Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/963#issuecomment-127661514
Merging
> PojoType fields not supported by field position keys
> -----------------------------------------------------
>
> Key: FLINK-2442
> URL: https://issues.apache.org/jira/browse/FLINK-2442
> Project: Flink
> Issue Type: Bug
> Components: Java API
> Affects Versions: 0.9
> Reporter: Fabian Hueske
> Assignee: Fabian Hueske
> Priority: Critical
> Fix For: 0.10, 0.9.1
>
>
> Tuple fields which are Pojos (or any other non-tuple composite type) cannot
> be selected as keys by field position keys.
> Something like
> {code}
> DataSet<Tuple2<Integer, MyPojo>> data = ...
> data.groupBy(1).reduce(...)
> {code}
> fails with an exception.
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