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https://issues.apache.org/jira/browse/FLINK-11449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16758373#comment-16758373
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sunjincheng commented on FLINK-11449:
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Hi [~dawidwys] thanks for your reply.
About CAST defined as an expression different from functioncall is simply to
follow the current status, and then a simple conversion can complete
RexNode-free, but I think CAST as a functioncall is also reasonable. And I also
agree to solve the udx problem in a PR, I will try to prepare for the PR, I
will leave a message in the process if I need to discuss!
Best,Jincheng
> 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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