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https://issues.apache.org/jira/browse/FLINK-11449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16760988#comment-16760988
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sunjincheng commented on FLINK-11449:
-------------------------------------

Great thanks for the summarize [~twalthr] I think 

I think your proposal is very clearly!
I am already developing, I'll open the PR. as soon as possible.

> Uncouple the Expression class from RexNodes
> -------------------------------------------
>
>                 Key: FLINK-11449
>                 URL: https://issues.apache.org/jira/browse/FLINK-11449
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>            Reporter: Timo Walther
>            Assignee: sunjincheng
>            Priority: Major
>
> A more detailed description can be found in 
> [FLIP-32|https://cwiki.apache.org/confluence/display/FLINK/FLIP-32%3A+Restructure+flink-table+for+future+contributions].
> Calcite will not be part of any API module anymore. Therefore, RexNode 
> translation must happen in a different layer. This issue will require a new 
> design document.



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