amaliujia commented on pull request #13306:
URL: https://github.com/apache/beam/pull/13306#issuecomment-729440157


   I am not sure if I have understand: 
   >One example is that a UDAF has to have a SQL
   
   This interface is the implementation interface of a UDAF, not a definition. 
Function definition should provide SQL types, but definition in our case is the 
CREATE FUNCTION statement.


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