public static Record convert(Schema schema, HiveRow row) {
    return convert(schema.asStruct(), row);
  }
Converts from HiveRow to Iceberg's internal data representation format
aka from POJOs used by Hive to hold record data into those of Iceberg
iceberg/iceberg-handler/src/main/java/org/apache/iceberg/mr/hive/vector/HiveValueConverter.java