Examples of lupos.engine.operators.index.BasicIndexScan.recomputeVariables()

                  }
                } else {
                  bi.getTriplePattern().remove(tp);
                  final Join join = new Join();
                  join.setUnionVariables(bi.getUnionVariables());
                  bi.recomputeVariables();
                  tp.recomputeVariables();
                  final HashSet<Variable> joinVars = new HashSet<Variable>(tp.getUnionVariables());
                  joinVars.retainAll(bi.getUnionVariables());
                  join.setIntersectionVariables(joinVars);
                  for(final OperatorIDTuple opID: bi.getSucceedingOperators()){

                  join.addPrecedingOperator(bi);


                  final LinkedList<TriplePattern> tpList = new LinkedList<TriplePattern>();
                  tpList.add(tp);
                  final BasicIndexScan newIndex = ((Root)rootQuery).newIndexScan(new OperatorIDTuple(join, 1), tpList, bi.getGraphConstraint());
                  newIndex.recomputeVariables();
                  join.addPrecedingOperator(newIndex);
                  rootQuery.addSucceedingOperator(newIndex);
                  newIndex.addPrecedingOperator(rootQuery);
                  newTP.addSucceedingOperator(new OperatorIDTuple(join, 1));
                  join.addPrecedingOperator(newTP);

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