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https://issues.apache.org/jira/browse/FLINK-16993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17172057#comment-17172057
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godfrey he commented on FLINK-16993:
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Hi [~jackylau] I think we should use code-gen for computed column to convert 
RowData, which is just like codegen for project

> Support SupportsComputedColumnPushDown in planner
> -------------------------------------------------
>
>                 Key: FLINK-16993
>                 URL: https://issues.apache.org/jira/browse/FLINK-16993
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table SQL / Planner
>            Reporter: Timo Walther
>            Assignee: jackylau
>            Priority: Major
>
> Support the {{SupportsComputedColumnPushDown}} interface for 
> {{ScanTableSource}}.



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