presto-spi/src/main/java/io/prestosql/spi/connector/ConnectorBucketNodeMap.java/ConnectorBucketNodeMap/createBucketNodeMap
class ConnectorBucketNodeMap:    public static ConnectorBucketNodeMap createBucketNodeMap(int bucketCount)
    {
        return new ConnectorBucketNodeMap(bucketCount, Optional.empty());
    }