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https://issues.apache.org/jira/browse/FLINK-12533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16841207#comment-16841207
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sunjincheng commented on FLINK-12533:
-------------------------------------

+1 for this change! [~hequn8128]

> Introduce TABLE_AGGREGATE_FUNCTION FunctionDefinition.Type
> ----------------------------------------------------------
>
>                 Key: FLINK-12533
>                 URL: https://issues.apache.org/jira/browse/FLINK-12533
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table SQL / API
>            Reporter: Hequn Cheng
>            Assignee: Hequn Cheng
>            Priority: Major
>
> Currently, there are four kinds of {{FunctionDefinition.Type}},
> {code:java}
>       public enum Type {
>               AGGREGATE_FUNCTION,
>               SCALAR_FUNCTION,
>               TABLE_FUNCTION,
>               OTHER_FUNCTION
>       }
> {code}
> The Type AGGREGATE_FUNCTION is used to express both AggregateFunction and 
> TableAggregateFunction. However, due to the two kinds of the function 
> contains different semantics. It would be nice if we can separate these two 
> kinds of functions more clearly by introducing another type 
> TABLE_AGGREGATE_FUNCTION. 



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