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[jira] [Created] (FLINK-9484) Improve generic type inference for User-Defined Functions


Rong Rong created FLINK-9484:
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             Summary: Improve generic type inference for User-Defined Functions
                 Key: FLINK-9484
                 URL: https://issues.apache.org/jira/browse/FLINK-9484
             Project: Flink
          Issue Type: Improvement
          Components: Table API & SQL
            Reporter: Rong Rong
            Assignee: Rong Rong


User-defined function has been a great extension for Flink SQL API to support much complex logics. 
We experienced many inconvenience when dealing with UDF with generic types and are summarized in the following [doc|https://docs.google.com/document/d/1zKSY1z0lvtQdfOgwcLnCMSRHew3weeJ6QfQjSD0zWas/edit?usp=sharing].

We are planning to implement the generic type inference / functioncatalog look up in multiple phases. Detail tickets will be created.



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