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https://issues.apache.org/jira/browse/FLINK-15123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17536420#comment-17536420
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godfrey he commented on FLINK-15123:
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Thanks [~LingJin]
> remove uniqueKeys from FlinkStatistic in blink planner
> -------------------------------------------------------
>
> Key: FLINK-15123
> URL: https://issues.apache.org/jira/browse/FLINK-15123
> Project: Flink
> Issue Type: Technical Debt
> Components: Table SQL / Planner
> Reporter: godfrey he
> Priority: Major
> Labels: starter
> Attachments: b_5.txt
>
>
> {{uniqueKeys}} is a kind of constraint, it's unreasonable that {{uniqueKeys}}
> is a kind of statistic. so we should remove uniqueKeys from
> {{FlinkStatistic}} in blink planner. Some temporary solutions (e.g.
> {{RichTableSourceQueryOperation}}) should also be resolved after primaryKey
> is introduced in {{TableSchema}}
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