wangyum commented on pull request #31993:
URL: https://github.com/apache/spark/pull/31993#issuecomment-817253696


   > Sorry I may miss something. Why it's only a problem in nested column 
pruning but not column pruning?
   
   Nested column pruning removed the field:
   
https://github.com/apache/spark/blob/0f2c0b53e8fb18c86c67b5dd679c006db93f94a5/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/SchemaPruning.scala#L28-L42


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