presto-main/src/main/java/io/prestosql/sql/planner/optimizations/OptimizeMixedDistinctAggregations.java/AggregateInfo/setNewDistinctAggregateSymbol
class AggregateInfo:        public void setNewDistinctAggregateSymbol(Symbol newDistinctAggregateSymbol)
        {
            this.newDistinctAggregateSymbol = newDistinctAggregateSymbol;
        }