code: public QueryBuilder fromAllNodesAs( String alias ) {
          AllNodes allNodes = new AllNodes(selector(alias));
          SelectorName oldName = this.source instanceof Selector ? ((Selector)source).name() : null;
          // Go through the columns and change the selector name to use the new alias ...
          for (int i = 0; i != columns.size(); ++i) {
              Column old = columns.get(i);
              if (old.selectorName().equals(oldName)) {
                  columns.set(i, new Column(allNodes.aliasOrName(), old.getPropertyName(), old.getColumnName()));
              }
          }
          this.source = allNodes;
          return this;
      }
docs: Specify that the query should select from the "__ALLNODES__" built-in table using the supplied alias.
  
  @param alias the alias for the "__ALL_NODES" table; may not be null
  @return this builder object, for convenience in method chaining