presto-main/src/main/java/io/prestosql/sql/planner/optimizations/QueryCardinalityUtil.java/CardinalityExtractorPlanVisitor/visitProject
class CardinalityExtractorPlanVisitor:        @Override
        public Range<Long> visitProject(ProjectNode node, Void context)
        {
            return node.getSource().accept(this, null);
        }