scovich commented on PR #8395:
URL: https://github.com/apache/arrow-rs/pull/8395#issuecomment-3314277966

   @alamb -- we should track a follow-on item somewhere: Once we support array 
element shredding, we will have _three_ different semantics to deal with, and 
this fix will need to expand from a bool to an enum:
   
   When appending NULL:
   
   ||struct|value|typed_value|
   |-|-|-|-|
   |Variant|NULL|NULL|NULL
   |Object field|valid|NULL|NULL
   |Array element|valid|Variant::Null|NULL
   


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