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https://issues.apache.org/jira/browse/FLINK-11449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16762641#comment-16762641
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sunjincheng commented on FLINK-11449:
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Thanks [~twalthr] , I'll open the PR. today later.
> 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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