uros-db commented on PR #46597:
URL: https://github.com/apache/spark/pull/46597#issuecomment-2119209981

   also note that covering StringTypes which are fields of StructType is not by 
itself enough - suppose there's a field of StructType that is another 
StructType that has a field of collated StringType, etc.
   
   same goes for arrays, handling ArrayType(StringType) is not enough by itself 
- we also need ArrayType(ArrayType(StringType))
   
   in short, I would say that we need a recursive approach to properly handle 
all possible collated string instances


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