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https://issues.apache.org/jira/browse/FLINK-22942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17418382#comment-17418382
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Jark Wu commented on FLINK-22942:
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We may also need to add a release note for this, even if it was never a public
API, but there already been some users using it.
> 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
> Assignee: Francesco Guardiani
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.15.0
>
>
> 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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