presto-main/src/main/java/io/prestosql/sql/planner/iterative/rule/PushPartialAggregationThroughJoin.java/PushPartialAggregationThroughJoin/getPattern
class PushPartialAggregationThroughJoin:    @Override
    public Pattern<AggregationNode> getPattern()
    {
        return PATTERN;
    }