beliefer opened a new pull request #28430:
URL: https://github.com/apache/spark/pull/28430


   ### What changes were proposed in this pull request?
   This PR follows up https://github.com/apache/spark/pull/28194.
   As discussed at https://github.com/apache/spark/pull/28194/files#r418418796.
   This PR will improve `ExpressionsSchemaSuite` so that easy to track the diff.
   Although `ExpressionsSchemaSuite` at line 
   
https://github.com/apache/spark/blob/b7cde42b04b21c9bfee6535199cf385855c15853/sql/core/src/test/scala/org/apache/spark/sql/ExpressionsSchemaSuite.scala#L165
   just want to compare the total size between expected output size and the 
newest output size, the scalatest framework will output the extra information 
contains all the content of expected output and newest output.
   This PR will try to avoid this issue.
   
   
   ### Why are the changes needed?
   Make the exception more concise and clear.
   
   
   ### Does this PR introduce _any_ user-facing change?
   'No'.
   
   
   ### How was this patch tested?
   Jenkins test.
   


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