Tianshi Zhu created FLINK-21310:
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Summary: unexpected behavior of DataFrame union
Key: FLINK-21310
URL: https://issues.apache.org/jira/browse/FLINK-21310
Project: Flink
Issue Type: Bug
Reporter: Tianshi Zhu
[https://gist.github.com/tianshizz/fd1bdbcc4676783b7300984c0bf532c1]
The gist shows two unit tests. In one of them, a data stream unions with
itself. In the other, two identical data streams are unioned. However, the two
operations will lead to different end results, which seems surprising to me. Is
this expected? Could someone help me understand the different behaviors here?
Thanks!
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