FederationStatistics statistics = new FederationStatistics(federation.getExecutor(), members, query);
// new QueryJoinOptimizer(statistics).optimize(query, bindings);
// new FilterOptimizer().optimize(query, bindings);
new EmptyPatternOptimizer(members).optimize(query, bindings);
boolean distinct = federation.isDistinct();
PrefixHashSet local = federation.getLocalPropertySpace();
new FederationJoinOptimizer(members, distinct, local).optimize(query, bindings);
new OwnedTupleExprPruner().optimize(query, bindings);
new QueryModelPruner().optimize(query, bindings);