sunchao commented on pull request #32446:
URL: https://github.com/apache/spark/pull/32446#issuecomment-833302014


   > If the permanent functions are not used, unlike built-in ones, why it 
needs to preload all permanent functions? Doesn't it waste resources to load 
unused permanent functions?
   
   I'm not totally sure about the exact reason as it is not discussed in the 
original JIRA. But IMO a HS2 is usually long running so there is a good chance 
that many permanent UDFs will eventually be used. Instead of issuing separate 
HMS calls for each of them, it might be better to issue one call and load them 
all up front. 


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