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UpsertBatch -> PartitionedParquetFiles
Route incoming updates to append-only files structured via LSM-Tree partitioning, deferring primary key resolution and merges to read execution.
Problem it solves
Real-time, high-throughput upsert ingestion causes severe write amplification in traditional columnar storage formats.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.