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List<PartialStream> -> MergedRowStream
Combine parallel ingestion streams sharing a primary key by overlaying disjoint column values at query time without an explicit join.
Problem it solves
Constructing wide tables from separate, concurrent real-time ingestion streams using standard SQL joins is highly CPU and memory intensive.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.