@Override
  public String toString() {
    return "QBJoinTree [leftAlias=" + leftAlias + ", rightAliases=" + Arrays.toString(rightAliases) + ", leftAliases=" + Arrays.toString(leftAliases) + ", semiJoinHint=" + semiJoinHint + "]";
  }
Merge the rhs tables from another join tree.

@param src
         the source join tree
ql/src/java/org/apache/hadoop/hive/ql/parse/QBJoinTree.java