wgtmac commented on PR #35298:
URL: https://github.com/apache/arrow/pull/35298#issuecomment-1521059731

   Nullability of key field is only validated in the `MapType::Make` but not 
the constructors and it should be fixed.
   
   https://github.com/apache/arrow/blob/main/cpp/src/arrow/type.cc#L544-L559 
   
   


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