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https://issues.apache.org/jira/browse/FLINK-13773?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17337239#comment-17337239
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Leonard Xu commented on FLINK-13773:
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[~lzljs3620320] Could you take a look these unfinished tasks?
> Rework of the Expression Design
> -------------------------------
>
> Key: FLINK-13773
> URL: https://issues.apache.org/jira/browse/FLINK-13773
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / API
> Reporter: Jingsong Lee
> Priority: Major
>
> This JIRA addresses several shortcomings of current:
> - New Expressions still use PlannerExpressions to type inference and
> to RexNode. Flnk-planner and blink-planner have a lot of repetitive code
> and logic.
> - Let TableApi and Cacite definitions consistent.
> - Reduce the complexity of Function development.
> - Powerful Function for user.
>
> Key changes can be summarized as follows:
> - Improve the interface of FunctionDefinition.
> - Introduce type inference for built-in functions.
> - Introduce ExpressionConverter to convert Expression to calcite
> RexNode.
> - Remove repetitive code and logic in planners.
>
> Details:
> [https://cwiki.apache.org/confluence/display/FLINK/FLIP-51%3A+Rework+of+the+Expression+Design]
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