* 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
* old basic index scan (here we use the hack, to clone the
* succeeding list of the index scan, because when we