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https://issues.apache.org/jira/browse/FLINK-15881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17030381#comment-17030381
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Zhenghua Gao commented on FLINK-15881:
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This duplicates to FLINK-15445. The PR for FLINK-15445 would remove
*getRetrunType* in JDBCTableSource
> Stop overriding TableSource::getReturnType in jdbc connector
> ------------------------------------------------------------
>
> Key: FLINK-15881
> URL: https://issues.apache.org/jira/browse/FLINK-15881
> Project: Flink
> Issue Type: Sub-task
> Components: Connectors / JDBC, Table SQL / API
> Reporter: Kurt Young
> Assignee: Zhenghua Gao
> Priority: Major
> Fix For: 1.11.0
>
>
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