public void addToRoots(java.lang.String elem) {
    if (this.roots == null) {
      this.roots = new java.util.ArrayList<java.lang.String>();
    }
    this.roots.add(elem);
  }
Returns true if field nodeType 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