@Override
    public <A> SparqlTraversalSource withSideEffect(final String key, final Supplier<A> initialValue, final BinaryOperator<A> reducer) {
        return (SparqlTraversalSource) super.withSideEffect(key, initialValue, reducer);
    }
A {@link TraversalSource} implementation that spawns {@link SparqlTraversal} instances.

@author Stephen Mallette (http://stephen.genoprime.com)
sparql-gremlin/src/main/java/org/apache/tinkerpop/gremlin/sparql/process/traversal/dsl/sparql/SparqlTraversalSource.java