private double preparePlan() { TableFilter[] topArray = topFilters.toArray(new TableFilter[topFilters.size()]); for (TableFilter t : topArray) { t.setFullCondition(condition); } Optimizer optimizer = new Optimizer(topArray, condition, session); optimizer.optimize(); topTableFilter = optimizer.getTopFilter(); double planCost = optimizer.getCost(); setEvaluatableRecursive(topTableFilter); topTableFilter.prepare(); return planCost; }