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https://issues.apache.org/jira/browse/FLINK-3080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15034137#comment-15034137
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ASF GitHub Bot commented on FLINK-3080:
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Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/1425#issuecomment-161041124
Yes, you get each element twice, so it behaves like bag-union.
@mxm I added a test case.
> Cannot union a data stream with a product of itself
> ---------------------------------------------------
>
> Key: FLINK-3080
> URL: https://issues.apache.org/jira/browse/FLINK-3080
> Project: Flink
> Issue Type: Bug
> Components: Streaming
> Affects Versions: 0.10.0
> Reporter: Vasia Kalavri
> Assignee: Aljoscha Krettek
>
> Currently it is not possible to union a stream with itself or a product of
> itself.
> For example, the following code
> {{stream.union(stream.map(...))}}
> fails with this exception: "A DataStream cannot be unioned with itself".
> The documentation currently states that "If you union a data stream with
> itself you will still only get each element once." and should also be updated.
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