lirui-apache commented on pull request #14802:
URL: https://github.com/apache/flink/pull/14802#issuecomment-770731219


   @wuchong Thanks for the review.
   
   > I'm wondering should we also add listener to the create/drop on temporary 
system function?
   
   I didn't add API for temp system function because it doesn't belong to any 
catalog. The listener interface is only meant for a catalog to implement, and 
it'll only get invoked for temp objects belonging to that catalog. So I'm 
afraid we don't have a good way to support temp hive system function.


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