See: Description
| Class | Description | 
|---|---|
| DetectNewPartitionsState | Metadata of the progress of  DetectNewPartitionsDoFnfrom the metadata
 table. | 
| InitialPipelineState | States to initialize a pipeline outputted by  InitializeDoFn. | 
| NewPartition | Represent new partition as a result of splits and merges. | 
| PartitionRecord | Output result of  DetectNewPartitionsDoFncontaining
 information required to stream a partition. | 
| StreamPartitionWithWatermark |