presto-main/src/main/java/io/prestosql/sql/planner/planprinter/PlanPrinter.java/PlanPrinter/visitFilter
class PlanPrinter:        @Override
        public Void visitFilter(FilterNode node, Void context)
        {
            return visitScanFilterAndProjectInfo(node, Optional.of(node), Optional.empty(), context);
        }