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https://issues.apache.org/jira/browse/FLINK-3736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15236956#comment-15236956
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Yijie Shen commented on FLINK-3736:
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Ah I see, thanks :)
> Move toRexNode and toAggCall logic into Expressions
> ---------------------------------------------------
>
> Key: FLINK-3736
> URL: https://issues.apache.org/jira/browse/FLINK-3736
> Project: Flink
> Issue Type: Improvement
> Components: Table API
> Reporter: Yijie Shen
> Assignee: Yijie Shen
> Priority: Minor
>
> Since we have a one-to-one mapping from Flink {{Expression}} to Calcite
> {{RexNode}}, and we will implement more and more expressions to make
> flink-table a full-fledged module, I think it's worthwhile to let each
> {{Expression}} take care of its own behaviour on conversion to {{RexNode}}.
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