cloud-fan commented on PR #37011:
URL: https://github.com/apache/spark/pull/37011#issuecomment-1174552203

   > Can we just use withNullability in reconcileColumnType with config/flags?
   
   It only works for attributes, but nested fields are not attributes. Without 
a reasonable use case I'm a bit reluctant to add a new expression just for this 
case.
   
   > Do you have this convention documented somewhere?
   
   It's obvious that not everyone can update scala/SQL/Python/R code 
altogether...


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