@Override
    public Object visitTraversalTerminalMethod_explain(final GremlinParser.TraversalTerminalMethod_explainContext ctx) {
        return traversal.explain();
    }
{@inheritDoc}

Traversal terminal method explain step
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/language/grammar/TraversalTerminalMethodVisitor.java