public class IndexWhereResolver implements PhysicalPlanResolver {
@Override
public PhysicalContext resolve(PhysicalContext physicalContext) throws SemanticException {
Dispatcher dispatcher = new IndexWhereTaskDispatcher(physicalContext);
GraphWalker opGraphWalker = new DefaultGraphWalker(dispatcher);
ArrayList<Node> topNodes = new ArrayList<Node>();
topNodes.addAll(physicalContext.getRootTasks());
opGraphWalker.startWalking(topNodes, null);