novatechflow opened a new pull request, #646:
URL: https://github.com/apache/incubator-wayang/pull/646

   ## Summary
   
   - Add Spark Dataset/DataFrame plumbing: Parquet source/sink flag, channel 
conversions, optimizer cost hints.
   - Document how to build dataset-backed pipelines (`README.md`, 
`guides/spark-datasets.md`).
   
   ## Next steps / follow-ups
   
   - ML4All pipelines still emit/consume raw `double[]`/`Double` RDDs. We 
should extend them to use `DatasetChannel`s once schema handling is in place.
   - Text/Object sources currently produce RDD channels. A Record-backed 
variant (or a conversion helper) would allow dataset output without extra user 
code.
   


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