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Logically: represents a `unit of work` of external data ingestion into a target dataset def~dataset;  a set of `hudi` records.

Physically: represents a list of `delta file`s delta/log files (in `Avro` format) representing the external data differences / deltas not yet merged in the target dataset def~dataset.

Related concepts

1. datasetdef~dataset
2. timeline instant
3. commit time
4. storage type
5. Merge def~Merge-On-Read (MOR)
6. Copy-On-Write (COW)

Status (draft)