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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-3080) Cannot union a data stream with a product of itself
Date Tue, 01 Dec 2015 15:38:11 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15033886#comment-15033886

ASF GitHub Bot commented on FLINK-3080:

Github user vasia commented on the pull request:

    Hi @aljoscha,
    thanks for fixing this! It seems that, with this change, when you union a stream with
itself you get each element twice. If this is intentional, could you please also update the

> 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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