[jira] [Created] (FLINK-22942) Disable upsert into syntax in Flink SQL

[Shang Yuanchun (Jira)]

Leonard Xu created FLINK-22942:
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             Summary: Disable upsert into syntax in Flink SQL
                 Key: FLINK-22942
                 URL: https://issues.apache.org/jira/browse/FLINK-22942
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / API
            Reporter: Leonard Xu


I found we can write  *insert into* and *upsert into* in Flink SQL， but the later syntax's semantic and behavior is never discussed, currently they have same implementation.

We should disable the later one util we support  `*upsert into* ` with correct behavior.



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