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package org.apache.hadoop.hive.ql.parse;

Library of utility functions used in the parse code.
public final class ParseUtils {

Tests whether the parse tree node is a join token.

node The parse tree node
  public static boolean isJoinToken(ASTNode node) {
    switch (node.getToken().getType()) {
    case .:
      return true;
      return false;

Performs a descent of the leftmost branch of a tree, stopping when either a node with a non-null token is found or the leaf level is encountered.

tree candidate node from which to start searching
node at which descent stopped
  public static ASTNode findRootNonNullToken(ASTNode tree) {
    while ((tree.getToken() == null) && (tree.getChildCount() > 0)) {
      tree = (ASTNodetree.getChild(0);
    return tree;
  private ParseUtils() {
    // prevent instantiation
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