presto-main/src/main/java/io/prestosql/cost/FilterStatsCalculator.java/FilterStatsCalculator/FilterExpressionStatsCalculatingVisitor
class FilterStatsCalculator:        FilterExpressionStatsCalculatingVisitor(PlanNodeStatsEstimate input, Session session, TypeProvider types)
        {
            this.input = input;
            this.session = session;
            this.types = types;
        }