presto-main/src/main/java/io/prestosql/sql/planner/optimizations/OptimizeMixedDistinctAggregations.java/OptimizeMixedDistinctAggregations/isFoundMarkDistinct
class OptimizeMixedDistinctAggregations:        public boolean isFoundMarkDistinct()
        {
            return foundMarkDistinct;
        }