Method accept

fe/src/main/java/org/apache/impala/common/TreeNode.java:243–247

Visitor pattern accept method

(Visitor<C> visitor)

   * Visitor pattern accept method
   */
  @SuppressWarnings("unchecked")
  public <C extends TreeNode<NodeType>> void accept(Visitor<C> visitor) {
    visitor.visit((C) this);
    for (NodeType p: children_) p.accept(visitor);
  }

  /**
   * A variant of visitor pattern accept method that do post-order traversal instead