Method getChild

fe/src/main/java/org/apache/impala/common/TreeNode.java:33–35

(int i)

  protected List<NodeType> children_ = new ArrayList<>();

  public NodeType getChild(int i) {
    return hasChild(i) ? children_.get(i) : null;
  }

  public void addChild(NodeType n) {
    children_.add(n);