HeartSaVioR commented on pull request #30033:
URL: https://github.com/apache/spark/pull/30033#issuecomment-708160066


   >> We can't get the information about the reason why the operator is 
considered as unresolved
   
   > This is a good point. CheckAnalysis provides better error messages for 
many cases, and the unresolved operator error is the last resort. I think we 
should provide better error message for this case as well.
   
   Yeah. It looks to be a bit tricky to generalize as any operator can make a 
decision on resolvable arbitrary. Probably the operator needs to have some 
method to provide additional information on `resolve` so that Analyzer can call 
to print out?


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