presto-main/src/main/java/io/prestosql/sql/planner/iterative/rule/AddExchangesBelowPartialAggregationOverGroupIdRuleSet.java/AddExchangesBelowPartialAggregationOverGroupIdRuleSet/rules
class AddExchangesBelowPartialAggregationOverGroupIdRuleSet:    public Set<Rule<?>> rules()
    {
        return ImmutableSet.of(
                new AddExchangesBelowProjectionPartialAggregationGroupId(),
                new AddExchangesBelowExchangePartialAggregationGroupId());
    }