presto-main/src/main/java/io/prestosql/sql/planner/optimizations/OptimizeMixedDistinctAggregations.java/OptimizeMixedDistinctAggregations/AggregateInfo
class OptimizeMixedDistinctAggregations:        public AggregateInfo(List<Symbol> groupBySymbols, Symbol mask, Map<Symbol, Aggregation> aggregations)
        {
            this.groupBySymbols = ImmutableList.copyOf(groupBySymbols);

            this.mask = mask;

            this.aggregations = ImmutableMap.copyOf(aggregations);
        }