@Override
  public StructField getStructFieldRef(String fieldName) {
    return ObjectInspectorUtils.getStandardStructFieldRef(fieldName, fields);
  }
This method is only intended to be used by Utilities class in this package.
The reason that this method is not recursive by itself is because we want
to allow recursive types.
serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/ReflectionStructObjectInspector.java