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https://issues.apache.org/jira/browse/FLINK-21283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17327191#comment-17327191
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Jark Wu commented on FLINK-21283:
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[~zhangjun], the community doesn't have a plan for this yet. But welcome for
designs.
> Support sql extension for flink sql
> ------------------------------------
>
> Key: FLINK-21283
> URL: https://issues.apache.org/jira/browse/FLINK-21283
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / API
> Affects Versions: 1.12.1
> Reporter: Jun Zhang
> Priority: Major
>
> I think we should add sql extension for flink sql so that users can customize
> sql parsing, sql optimization, etc. we can refer to [spark sql extension
> |https://issues.apache.org/jira/browse/SPARK-18127]
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