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https://issues.apache.org/jira/browse/FLINK-24116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17408617#comment-17408617
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Jark Wu commented on FLINK-24116:
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We need to be careful here. Because primary key on bounded table should still
be valid.
> PRIMARY KEY declaration on insert-only table is not validated globally
> ----------------------------------------------------------------------
>
> Key: FLINK-24116
> URL: https://issues.apache.org/jira/browse/FLINK-24116
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / API
> Reporter: Timo Walther
> Priority: Major
>
> In the regular Kafka connector, we validate that a primary key is not defined
> on an insert-only table source:
> https://github.com/apache/flink/pull/13850/commits/c1d4dc89fa629e0f04102e7ab2fa94984cd98218
> However, this should be validated for every connector because it is confusing
> if it works for others. We should validate this in the planner instead.
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