[jira] [Commented] (FLINK-7358) Add implicitly converts support for User-defined function

["Fabian Hueske (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-7358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16114920#comment-16114920 ] 

Fabian Hueske commented on FLINK-7358:
--------------------------------------

Thanks [~sunjincheng121]. 
Sounds good to me. We should make sure that we have the same auto-cast semantics as SQL via Calcite.

> Add  implicitly converts support for User-defined function
> ----------------------------------------------------------
>
>                 Key: FLINK-7358
>                 URL: https://issues.apache.org/jira/browse/FLINK-7358
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>            Reporter: sunjincheng
>            Assignee: sunjincheng
>
> Currently if user defined a UDF as follows:
> {code}
> object Func extends ScalarFunction {
>   def eval(a: Int, b: Long): String = {
>     ...
>   }
> }
> {code}
> And if the table schema is (a: Int, b: int, c: String), then we can not call the UDF `Func('a, 'b)`. So
> I want add implicitly converts when we call UDF. The implicitly convert rule is:
> BYTE_TYPE_INFO -> SHORT_TYPE_INFO -> INT_TYPE_INFO -> LONG_TYPE_INFO -> FLOAT_TYPE_INFO -> DOUBLE_TYPE_INFO
> *Note:
> In this JIRA. only for TableAPI, And SQL will be fixed in https://issues.apache.org/jira/browse/CALCITE-1908.*
> What do you think? [~fhueske]



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