code: public JoinClause fullOuterJoinAllNodesAs( String alias ) {
          // Expect there to be a source already ...
          return new JoinClause(namedSelector(AllNodes.ALL_NODES_NAME + " AS " + alias), JoinType.FULL_OUTER);
      }
docs: Perform a full outer join between the already defined source with the "__ALL_NODES" table using the supplied alias.
  
  @param alias the alias for the "__ALL_NODES" table; may not be null
  @return the component that must be used to complete the join specification; never null