@org.apache.thrift.annotation.Nullable
  public java.lang.Object getFieldValue(_Fields field) {
    switch (field) {
    case S_INT_STRING:
      return getSIntString();

    case A_STRING:
      return getAString();

    }
    throw new java.lang.IllegalStateException();
  }
Returns true if field aString is set (has been assigned a value) and false otherwise
serde/src/gen/thrift/gen-javabean/org/apache/hadoop/hive/serde2/thrift/test/SetIntString.java