@Override
    public default SparqlTraversal<S, E> iterate() {
        Traversal.super.iterate();
        return this;
    }
Iterates the traversal presumably for the generation of side-effects.
sparql-gremlin/src/main/java/org/apache/tinkerpop/gremlin/sparql/process/traversal/dsl/sparql/SparqlTraversal.java