mzabaluev commented on issue #9231:
URL: https://github.com/apache/arrow-rs/issues/9231#issuecomment-3774836660

   If the nullability of the array field ("element") is changed to false, the 
test passes.
   
   The writer schema prints out as follows:
   
   ```
   Complex(
       Record(
           Record {
               name: "table",
               namespace: None,
               doc: None,
               aliases: [],
               fields: [
                   Field {
                       name: "int_array",
                       doc: None,
                       type: Complex(
                           Array(
                               Array {
                                   items: TypeName(
                                       Primitive(
                                           Int,
                                       ),
                                   ),
                                   attributes: Attributes {
                                       logical_type: None,
                                       additional: {
                                           "element-id": Number(2),
                                       },
                                   },
                               },
                           ),
                       ),
                       default: None,
                       aliases: [],
                   },
               ],
               attributes: Attributes {
                   logical_type: None,
                   additional: {},
               },
           },
       ),
   )
   ```
   
   Should the nullable reader schema extend the non-nullable writer schema?


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