dianfu commented on pull request #15360:
URL: https://github.com/apache/flink/pull/15360#issuecomment-814565681


   @YikSanChan I'm considering adding another page to hold this information 
instead of putting it inside ScalarFunction as it applies also to other kinds 
of user-defined functions. Besides the unit test, the page could also contain 
the other informations about user-defined function, e.g. logging, how to load a 
large data set, etc. 


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