presto-spi/src/main/java/io/prestosql/spi/connector/ConnectorNodePartitioningProvider.java/ConnectorNodePartitioningProvider/getSplitBucketFunction
class ConnectorNodePartitioningProvider:    ToIntFunction<ConnectorSplit> getSplitBucketFunction(ConnectorTransactionHandle transactionHandle, ConnectorSession session, ConnectorPartitioningHandle partitioningHandle);