Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/2025#issuecomment-221186678
Thanks for the PR, @yjshen. Looks good except for a few minor comments.
Can you also add one test method to the Scala SQL UnionITCase, such that
the SQL side is also covered?
Union on streams cannot be supported right now. It would need a lot of the
windowing logic to deduplicate rows.
Thanks, Fabian
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