private double calculateInfluenceCostRatio() {
Formula boolDiff =
new Not(
greqlEvaluator,
new Equiv(greqlEvaluator, trueFormula, new Not(greqlEvaluator, falseFormula)));
boolDiff = boolDiff.simplify();
// selectivity of the boolean difference
double selectivity = boolDiff.getSelectivity();
// costs of the condition expression
VertexEvaluator veval = greqlEvaluator.getVertexEvaluatorGraphMarker().getMark(condition);
GraphSize graphSize = null;
if (greqlEvaluator.getDatagraph() != null) {
graphSize = new GraphSize(greqlEvaluator.getDatagraph());
} else {
graphSize = OptimizerUtility.getDefaultGraphSize();
}
long costs = veval.getInitialSubtreeEvaluationCosts(graphSize);
return selectivity / costs;
}
