wjones127 commented on issue #1697:
URL: https://github.com/apache/arrow-rs/issues/1697#issuecomment-1712132480

   FYI, the [arrow spec 
says](https://github.com/apache/arrow/blob/c4b01c60fba85bbfc3a1b1510e179153c0f79515/format/Schema.fbs#L124):
   
   > Neither the "entries" field nor the "key" field may be nullable. 
   
   So it's safe to ignore the nullability at the struct level and for the key 
field.


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