pitrou commented on PR #60:
URL: https://github.com/apache/parquet-testing/pull/60#issuecomment-2419906893

   I don't understand how the structure here is different from the "list of 
lists" example in 
https://github.com/apache/parquet-format/blob/master/LogicalTypes.md#lists
   
   Witness:
   ```
   required group a (LIST) {
     repeated group list {
       required group element (LIST) {
         repeated group list {
           required int32 element;
         }
       }
     }
   }
   ```
   
   vs.
   ```
   optional group array_of_arrays (LIST) {
     repeated group list {
       required group element (LIST) {
         repeated group list {
           required int32 element;
         }
       }
     }
   }
   ```
   


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