public void addGlobalChild(final Traversal.Admin<?, ?> globalChildTraversal) {
        this.configureStartAndEndSteps(globalChildTraversal);
        this.matchTraversals.add(this.integrateChild(globalChildTraversal));
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/MatchStep.java