presto-main/src/main/java/io/prestosql/sql/planner/optimizations/UnaliasSymbolReferences.java/UnaliasSymbolReferences/visitPlan
class UnaliasSymbolReferences:        @Override
        protected PlanNode visitPlan(PlanNode node, RewriteContext<Void> context)
        {
            throw new UnsupportedOperationException("Unsupported plan node " + node.getClass().getSimpleName());
        }