/*
* connect the basic index scan and the 2nd subgraph
* container in the join-operator in the 1st subgraph
* container
*/
bis.addSucceedingOperator(smallJoin, 0);
smallJoin.addPrecedingOperator(sg2);
sg2.addSucceedingOperator(smallJoin, 1);
smallJoin.addPrecedingOperator(bis);
/*
* now connect the join with the succeeding operators of the