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

    case ROOTS:
      return getRoots();

    case ADJACENCY_LIST:
      return getAdjacencyList();

    }
    throw new java.lang.IllegalStateException();
  }
Returns true if field adjacencyList is set (has been assigned a value) and false otherwise
ql/src/gen/thrift/gen-javabean/org/apache/hadoop/hive/ql/plan/api/Graph.java