public void addToChildren(java.lang.String elem) {
    if (this.children == null) {
      this.children = new java.util.ArrayList<java.lang.String>();
    }
    this.children.add(elem);
  }
Returns true if field node is set (has been assigned a value) and false otherwise
ql/src/gen/thrift/gen-javabean/org/apache/hadoop/hive/ql/plan/api/Adjacency.java