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The data exchange operation (also called Shuffle in other context) exposes performance impacts in the distributed query execution. And such performance evaluation could help StorageManager, when loading a block, to determine whether to fetch a block from remote or load from the persistent storage.

Check the Semantics Equivalence between the single-node and distributed version

In the distributed version, some operator (e.g., delete, update) is not trivial to implement to ensure the data consistency due to block caches.

Partition Support in (Distributed) Quickstep

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