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https://issues.apache.org/jira/browse/FLINK-5225?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jark Wu updated FLINK-5225:
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    Component/s: Table API & SQL

> Add interface to override parameter types of UDTF's eval method
> ---------------------------------------------------------------
>
>                 Key: FLINK-5225
>                 URL: https://issues.apache.org/jira/browse/FLINK-5225
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>            Reporter: Jark Wu
>
> {{ScalarFunction}} has {{getParameterTypes()}} to be overridden if the 
> parameter types of the eval method can not be determined automatically. This 
> is missing in {{TableFunction}}.  
> This needs to implement a custom Calcite's {{TableFunction}} and override 
> {{getParameters()}}. But currently, the {{FlinkTableFunctionImpl}} extends 
> {{ReflectiveFunctionBase}}, the {{ReflectiveFunctionBase}} determines the 
> parameter types of the eval method. 



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