presto-main/src/main/java/io/prestosql/execution/scheduler/FixedSourcePartitionedScheduler.java/BucketedSplitPlacementPolicy/getNodeForBucket
class BucketedSplitPlacementPolicy:        public InternalNode getNodeForBucket(int bucketId)
        {
            return bucketNodeMap.getAssignedNode(bucketId).get();
        }