def nodeInputDataPacket(self, dagNode, input):
        (outputNode, output) = self.nodeInputComesFromNode(dagNode, input)
        return self.nodeOutputDataPacket(outputNode, output)
return a 3-tuple of strings containing:
dataset/ETHPy150Open andrew-gardner/dependsworkflow/depends/depends_dag.py/DAG.nodeInputDataPacket--crossover with--dataset/ETHPy150Open appnexus/schema-tool/schematool/db/_hive.py/HiveDb.run_file_cmd