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