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ParquetDataset -> Stream<Row>
Distribute non-overlapping sets of Parquet row-groups to distributed data-parallel training workers based on their rank and world size.
Problem it solves
Distributed workers must read disjoint subsets of a single massive dataset without central coordinator bottlenecks.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.