github.com/fraugster/parquet-go@v0.12.0/parquetschema/schema-files/test5.schema (about)

     1  message foo {
     2    optional group bar (MAP) {
     3      repeated group key_value {
     4        required int32 key;
     5        required int32 value;
     6      }
     7    }
     8  }