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https://issues.apache.org/jira/browse/FLINK-21310?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Metzger updated FLINK-21310:
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Component/s: API / DataStream
> 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: Major
>
> [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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