[jira] [Updated] (FLINK-21310) unexpected behavior of DataStream union

["Flink Jira Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-21310?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Flink Jira Bot updated FLINK-21310:
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    Labels: auto-deprioritized-major stale-minor  (was: auto-deprioritized-major)

I am the [Flink Jira Bot|https://github.com/apache/flink-jira-bot/] and I help the community manage its development. I see this issues has been marked as Minor but is unassigned and neither itself nor its Sub-Tasks have been updated for 180 days. I have gone ahead and marked it "stale-minor". If this ticket is still Minor, please either assign yourself or give an update. Afterwards, please remove the label or in 7 days the issue will be deprioritized.


> unexpected behavior of DataStream union
> ---------------------------------------
>
>                 Key: FLINK-21310
>                 URL: https://issues.apache.org/jira/browse/FLINK-21310
>             Project: Flink
>          Issue Type: Bug
>          Components: API / DataStream
>    Affects Versions: 1.12.0
>            Reporter: Tianshi Zhu
>            Priority: Minor
>              Labels: auto-deprioritized-major, stale-minor
>
> [https://gist.github.com/tianshizz/fd1bdbcc4676783b7300984c0bf532c1]
> The gist shows three unit tests, that have different union behaviors. In the first one, a data stream unions with itself. In the second one, two identical data streams are unioned. However, the two operations will lead to different end results, which seems surprising to me. 
> In the third test when the list is long enough, union can show nondeterministic behavior. When running the third test for multiple times, each time the test will fail with a different `i` position.
> Are these expected? Could someone help me understand the different behaviors here?
> Thanks!



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