POutput POutput is an abstraction of output values of PTransforms. Contract getPipeline Method Pipeline getPipeline() The owning Pipeline of the POutput expand Method Map<TupleTag<?>, PValue> expand() finishSpecifyingOutput Method void finishSpecifyingOutput( String transformName, PInput input, PTransform<?, ?> transform) Available POutputs Table 1. POutputs (Direct Implementations and Extensions Only) POutput Description PCollectionList PCollectionTuple PDone PValue Result WriteFilesResult