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https://issues.apache.org/jira/browse/FLINK-16993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17173094#comment-17173094
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Timo Walther commented on FLINK-16993:
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[~godfreyhe] is right. It should be similar to the code of a projection that is
generated and passed as a string in the `ComputedColumnConverter`
implementation class. The code is then compiled in the open method of
`ComputedColumnConverter`.
> 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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