gengliangwang commented on pull request #31349:
URL: https://github.com/apache/spark/pull/31349#issuecomment-776066948


   > All the numeric types are also atomic types, so this match cannot happen? 
Am I missing something?
   
   @maropu there is an object `NumericType` and it can't be matched as atomic 
types.
   ```
   private[spark] object NumericType extends AbstractDataType 
   ```


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