github.com/fraugster/parquet-go@v0.12.0/parquetschema/schema-files/test4.schema (about)

     1  message foo {
     2    optional group array_of_arrays (LIST) {
     3      repeated group list {
     4        required group element (LIST) {
     5          repeated group list {
     6            required int32 element;
     7          }
     8        }
     9      }
    10    }
    11  }