beliefer opened a new pull request #28194: [SPARK-31372][SQL][Test] Display 
expression schema for double check.
URL: https://github.com/apache/spark/pull/28194
 
 
   #27872 # What changes were proposed in this pull request?
   Although SPARK-30184 Implement a helper method for aliasing functions, 
developers always forget to using this improvement.
   We need to add more powerful guarantees so that aliases outputed by built-in 
functions are correct.
   This PR extracts the SQL from the example of expressions, and output the SQL 
and its schema into one golden file.
   By checking the golden file, we can find the expressions whose aliases are 
not displayed correctly, and then fix them.
   
   ### Why are the changes needed?
   Ensure that the output alias is correct
   
   
   ### Does this PR introduce any user-facing change?
   'No'.
   
   
   ### How was this patch tested?
   Jenkins test.
   

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