comphead commented on PR #5246:
URL: 
https://github.com/apache/arrow-datafusion/pull/5246#issuecomment-1426531092

   @melgenek 
https://github.com/apache/arrow-datafusion/blob/master/datafusion/core/tests/sqllogictests/src/engines/datafusion/normalize.rs#L44
   Please double check  if schema comparison is needed? Is there any real 
scenario that Dataframe has schema incosistency between first batches and other 
batches? 
   
   I have noticed the only diff can be for nullable or metadata in optimizer, 
but this ignored like 
[equivalent_names_and_types](https://github.com/apache/arrow-datafusion/blob/master/datafusion/common/src/dfschema.rs#L345).
 
   
   


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