presto-main/src/main/java/io/prestosql/sql/planner/PlanFragmenter.java/PlanFragmenter/GroupedExecutionTagger
class PlanFragmenter:        public GroupedExecutionTagger(Session session, Metadata metadata, NodePartitioningManager nodePartitioningManager)
        {
            this.session = requireNonNull(session, "session is null");
            this.metadata = requireNonNull(metadata, "metadata is null");
            this.nodePartitioningManager = requireNonNull(nodePartitioningManager, "nodePartitioningManager is null");
            this.groupedExecutionEnabled = SystemSessionProperties.isGroupedExecutionEnabled(session);
        }