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Logically: represents a `unit of work` of external data ingestion into a target `Hudi` dataset; a set of `hudi` records.
Physically: represents a list of `delta file`s (in `Avro` format) representing the external data deltas not yet merged in the target `Hudi` dataset.
Related concepts
- dataset
- storage type
- Merge On Read (MOR)
- Copy On Write (COW)
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